Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

The remote NewStart CGSL host, running version MAIN 6.02, has firefox packages installed that are affected by multiple vulnerabilities:

  - crossbeam-deque is a package of work-stealing deques for building task schedulers when programming in     Rust. In versions prior to 0.7.4 and 0.8.0, the result of the race condition is that one or more tasks in     the worker queue can be popped twice instead of other tasks that are forgotten and never popped. If tasks     are allocated on the heap, this can cause double free and a memory leak. If not, this still can cause a     logical bug. Crates using `Stealer::steal`, `Stealer::steal_batch`, or `Stealer::steal_batch_and_pop` are     affected by this issue. This has been fixed in crossbeam-deque 0.8.1 and 0.7.4. (CVE-2021-32810)

  - Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. Some of these     bugs showed evidence of memory corruption and we presume that with enough effort some of these could have     been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.14, Thunderbird < 78.14,     and Firefox < 92. (CVE-2021-38493)

  - During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in     memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15,     Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93. (CVE-2021-38496)

  - Through use of reportValidity() and window.open(), a plain-text validation message could have been     overlaid on another origin, leading to possible user confusion and spoofing attacks. This vulnerability     affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2. (CVE-2021-38497)

  - During process shutdown, a document could have caused a use-after-free of a languages service object,     leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93,     Thunderbird < 91.2, and Firefox ESR < 91.2. (CVE-2021-38498)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has firefox packages installed that are affected by multiple vulnerabilities:

  - crossbeam-deque is a package of work-stealing deques for building task schedulers when programming in     Rust. In versions prior to 0.7.4 and 0.8.0, the result of the race condition is that one or more tasks in     the worker queue can be popped twice instead of other tasks that are forgotten and never popped. If tasks     are allocated on the heap, this can cause double free and a memory leak. If not, this still can cause a     logical bug. Crates using `Stealer::steal`, `Stealer::steal_batch`, or `Stealer::steal_batch_and_pop` are     affected by this issue. This has been fixed in crossbeam-deque 0.8.1 and 0.7.4. (CVE-2021-32810)

  - During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in     memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15,     Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93. (CVE-2021-38496)

  - Through use of reportValidity() and window.open(), a plain-text validation message could have been     overlaid on another origin, leading to possible user confusion and spoofing attacks. This vulnerability     affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2. (CVE-2021-38497)

  - During process shutdown, a document could have caused a use-after-free of a languages service object,     leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93,     Thunderbird < 91.2, and Firefox ESR < 91.2. (CVE-2021-38498)

  - Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these     bugs showed evidence of memory corruption and we presume that with enough effort some of these could have     been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2,     Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93. (CVE-2021-38500)

  - Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these     bugs showed evidence of memory corruption and we presume that with enough effort some of these could have     been exploited to run arbitrary code. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and     Firefox ESR < 91.2. (CVE-2021-38501)

  - The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass     restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects     Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38503)

  - When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-     free could have resulted, leading to memory corruption and a potentially exploitable crash. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38504)

  - Through a series of navigations, Firefox could have entered fullscreen mode without notification or     warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38506)

  - The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded     to TLS while retaining the visual properties of an HTTP connection, including being same-origin with     unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port     8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the     browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin     with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38507)

  - By displaying a form validity message in the correct location at the same time as a permission prompt     (such as for geolocation), the validity message could have obscured the prompt, resulting in the user     potentially being tricked into granting the permission. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38508)

  - Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary     (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's     choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
    (CVE-2021-38509)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR     91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some     of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43534)

  - A use-after-free could have occured when an HTTP2 session object was released on a different thread,     leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43535)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:4123 advisory.

  - The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass     restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects     Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38503)

  - When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-     free could have resulted, leading to memory corruption and a potentially exploitable crash. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38504)

  - Through a series of navigations, Firefox could have entered fullscreen mode without notification or     warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38506)

  - The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded     to TLS while retaining the visual properties of an HTTP connection, including being same-origin with     unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port     8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the     browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin     with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38507)

  - By displaying a form validity message in the correct location at the same time as a permission prompt     (such as for geolocation), the validity message could have obscured the prompt, resulting in the user     potentially being tricked into granting the permission. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38508)

  - Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary     (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's     choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
    (CVE-2021-38509)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5248-1 advisory.

    Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially     crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of     service, obtain sensitive information, trick a user into accepting unwanted permissions, conduct header     splitting attacks, conduct spoofing attacks, bypass security restrictions, confuse the user, or execute     arbitrary code. (CVE-2021-4129, CVE-2021-4140, CVE-2021-29981, CVE-2021-29982, CVE-2021-29987,     CVE-2021-29991, CVE-2021-38495, CVE-2021-38496, CVE-2021-38497, CVE-2021-38498, CVE-2021-38500,     CVE-2021-38501, CVE-2021-38503, CVE-2021-38504, CVE-2021-38506, CVE-2021-38507, CVE-2021-38508,     CVE-2021-38509, CVE-2021-43534, CVE-2021-43535, CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,     CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543, CVE-2021-43545, CVE-2021-43656,     CVE-2022-22737, CVE-2022-22738, CVE-2022-22739, CVE-2022-22740, CVE-2022-22741, CVE-2022-22742,     CVE-2022-22743, CVE-2022-22745, CVE-2022-22747, CVE-2022-22748, CVE-2022-22751)

    It was discovered that Thunderbird ignored the configuration to require STARTTLS for an SMTP connection. A     person-in-the-middle could potentially exploit this to perform a downgrade attack in order to intercept     messages or take control of a session. (CVE-2021-38502)

    It was discovered that JavaScript was unexpectedly enabled in the composition area. An attacker could     potentially exploit this in combination with another vulnerability, with unspecified impacts.
    (CVE-2021-43528)

    A buffer overflow was discovered in the Matrix chat library bundled with Thunderbird. An attacker could     potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2021-44538)

    It was discovered that Thunderbird's OpenPGP integration only considered the inner signed message when     checking signature validity in a message that contains an additional outer MIME layer. An attacker could     potentially exploit this to trick the user into thinking that a message has a valid signature.
    (CVE-2021-4126)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2874 advisory.

  - During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in     memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15,     Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93. (CVE-2021-38496)

  - Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these     bugs showed evidence of memory corruption and we presume that with enough effort some of these could have     been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2,     Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93. (CVE-2021-38500)

  - Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could     perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated     session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was     configured, the MITM could obtain the authentication credentials, too. This vulnerability affects     Thunderbird < 91.2. (CVE-2021-38502)

  - The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass     restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects     Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38503)

  - When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-     free could have resulted, leading to memory corruption and a potentially exploitable crash. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38504)

  - Through a series of navigations, Firefox could have entered fullscreen mode without notification or     warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38506)

  - The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded     to TLS while retaining the visual properties of an HTTP connection, including being same-origin with     unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port     8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the     browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin     with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38507)

  - By displaying a form validity message in the correct location at the same time as a permission prompt     (such as for geolocation), the validity message could have obscured the prompt, resulting in the user     potentially being tricked into granting the permission. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38508)

  - Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary     (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's     choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
    (CVE-2021-38509)

  - Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was     limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to     further an attack with other vulnerabilities. This vulnerability affects Thunderbird < 91.4.0.
    (CVE-2021-43528)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR     91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some     of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43534)

  - A use-after-free could have occured when an HTTP2 session object was released on a different thread,     leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43535)

  - Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the     target URL. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
    (CVE-2021-43536)

  - An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory     leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR <     91.4.0, and Firefox < 95. (CVE-2021-43537)

  - By misusing a race in our notification code, an attacker could have forcefully hidden the notification for     pages that had received full screen and pointer lock access, which could have been used for spoofing     attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
    (CVE-2021-43538)

  - Failure to correctly record the location of live pointers across wasm instance calls resulted in a GC     occurring within the call not tracing those live pointers. This could have led to a use-after-free causing     a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0,     and Firefox < 95. (CVE-2021-43539)

  - When invoking protocol handlers for external protocols, a supplied parameter URL containing spaces was not     properly escaped. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
    (CVE-2021-43541)

  - Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages     for loading external protocols. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and     Firefox < 95. (CVE-2021-43542)

  - Documents loaded with the CSP sandbox directive could have escaped the sandbox's script restriction by     embedding additional content. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and     Firefox < 95. (CVE-2021-43543)

  - Using the Location API in a loop could have caused severe application hangs and crashes. This     vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95. (CVE-2021-43545)

  - It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor.
    This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95. (CVE-2021-43546)

  - The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The     Olm session object represents a cryptographic channel between two parties. Therefore, its state is     partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of     messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a     buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were     undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces     and digits. The known affected products are Element Web And SchildiChat Web. (CVE-2021-44538)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 10 / 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5034 advisory.

    Multiple security issues were discovered in Thunderbird, which could result in the execution of arbitrary     code, spoofing, information disclosure, downgrade attacks on SMTP STARTTLS connections or misleading     display of OpenPGP/MIME signatures. For the oldstable distribution (buster), these problems have been     fixed in version 1:91.4.1-1~deb10u1. For the stable distribution (bullseye), these problems have been     fixed in version 1:91.4.1-1~deb11u1. We recommend that you upgrade your thunderbird packages. For the     detailed security status of thunderbird please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/thunderbird

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2863 advisory.

    Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially     result in the execution of arbitrary code, information disclosure or spoofing. Debian follows the extended     support releases (ESR) of Firefox. Support for the 78.x series has ended, so starting with this update     we're now following the 91.x releases. For Debian 9 stretch, these problems have been fixed in version     91.4.1esr-1~deb9u1. We recommend that you upgrade your firefox-esr packages. For the detailed security     status of firefox-esr please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/firefox-esr Further information about Debian LTS security advisories, how to     apply these updates to your system and frequently asked questions can be found at:
    https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5026 advisory.

    Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially     result in the execution of arbitrary code, information disclosure or spoofing. Debian follows the extended     support releases (ESR) of Firefox. Support for the 78.x series has ended, so starting with this update     we're now following the 91.x releases. Between 78.x and 91.x, Firefox has seen a number of feature     updates. For more information please refer to https://www.mozilla.org/en-US/firefox/91.0esr/releasenotes/     For the oldstable distribution (buster) one more final toolchain update is needed, updated packages will     shortly be available as 91.4.1esr-1~deb10u1 For the stable distribution (bullseye), these problem have     been fixed in version 91.4.1esr-1~deb11u1. We recommend that you upgrade your firefox-esr packages. For     the detailed security status of firefox-esr please refer to its security tracker page at:
    https://security-tracker.debian.org/tracker/firefox-esr

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4116 advisory.

  - The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass     restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects     Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38503)

  - When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-     free could have resulted, leading to memory corruption and a potentially exploitable crash. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38504)

  - Through a series of navigations, Firefox could have entered fullscreen mode without notification or     warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38506)

  - The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded     to TLS while retaining the visual properties of an HTTP connection, including being same-origin with     unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port     8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the     browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin     with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38507)

  - By displaying a form validity message in the correct location at the same time as a permission prompt     (such as for geolocation), the validity message could have obscured the prompt, resulting in the user     potentially being tricked into granting the permission. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38508)

  - Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary     (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's     choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
    (CVE-2021-38509)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR     91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some     of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43534)

  - A use-after-free could have occured when an HTTP2 session object was released on a different thread,     leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43535)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4134 advisory.

  - The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass     restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects     Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38503)

  - When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-     free could have resulted, leading to memory corruption and a potentially exploitable crash. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38504)

  - Through a series of navigations, Firefox could have entered fullscreen mode without notification or     warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38506)

  - The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded     to TLS while retaining the visual properties of an HTTP connection, including being same-origin with     unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port     8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the     browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin     with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This     vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38507)

  - By displaying a form validity message in the correct location at the same time as a permission prompt     (such as for geolocation), the validity message could have obscured the prompt, resulting in the user     potentially being tricked into granting the permission. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38508)

  - Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary     (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's     choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
    (CVE-2021-38509)

  - Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when     processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when     processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.
    (CVE-2021-43529)

  - Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR     91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some     of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43534)

  - A use-after-free could have occured when an HTTP2 session object was released on a different thread,     leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93,     Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-43535)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4607 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    This update upgrades Firefox to version 91.3.0 ESR.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4605 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    This update upgrades Firefox to version 91.3.0 ESR.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4132 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 91.3.0.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4130 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 91.3.0.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4134 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 91.3.0.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4133 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 91.3.0.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4123 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    This update upgrades Firefox to version 91.3.0 ESR.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:4116 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    This update upgrades Firefox to version 91.3.0 ESR.

    Security Fix(es):

    * Mozilla: Use-after-free in HTTP2 Session object

    * Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3

    * Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)

    * Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)

    * Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning     (CVE-2021-38506)

    * Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services     hosted on other ports (CVE-2021-38507)

    * Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing     (CVE-2021-38508)

    * Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 91.3. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-50 advisory.

  - The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass     restrictions such as executing scripts or navigating the top-level frame. (CVE-2021-38503)

  - When interacting with an HTML input element's file picker dialog with <code>webkitdirectory</code> set, a     use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash.
    (CVE-2021-38504)

  - Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record     data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios.
    Applications that wish to prevent copied data from being recorded in Cloud History must use specific     clipboard formats; and Thunderbird before version 91.3 did not implement them. This could have caused     sensitive data to be recorded to a user's Microsoft account. This bug only affects Thunderbird for Windows     10+ with Cloud Clipboard enabled. Other operating systems are unaffected. (CVE-2021-38505)

  - Through a series of web navigations, Thunderbird could have entered fullscreen mode without notification     or warning to the user. This could lead to spoofing attacks on the browser UI including phishing.
    (CVE-2021-38506)

  - The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded     to TLS while retaining the visual properties of an HTTP connection, including being same-origin with     unencrypted connections on port 80.  However, if a second encrypted port on the same IP address (e.g. port     8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the     browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin     with HTTP.  This was resolved by disabling the Opportunistic Encryption feature, which had low usage.
    (CVE-2021-38507)

  - By displaying a form validity message in the correct location at the same time as a permission prompt     (such as for geolocation), the validity message could have obscured the prompt, resulting in the user     potentially being tricked into granting the permission. (CVE-2021-38508)

  - Due to an unusual sequence of attacker-controlled events, a Javascript <code>alert()</code> dialog with     arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the     attacker's choosing. (CVE-2021-38509)

  - The executable file warning was not presented when downloading .inetloc files, which, due to a flaw in Mac     OS, can run commands on a user's computer. Note: This issue only affected Mac OS operating systems. Other     operating systems are unaffected. (CVE-2021-38510)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 91.3. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-50 advisory.

  - The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass     restrictions such as executing scripts or navigating the top-level frame. (CVE-2021-38503)

  - When interacting with an HTML input element's file picker dialog with <code>webkitdirectory</code> set, a     use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash.
    (CVE-2021-38504)

  - Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record     data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios.
    Applications that wish to prevent copied data from being recorded in Cloud History must use specific     clipboard formats; and Thunderbird before version 91.3 did not implement them. This could have caused     sensitive data to be recorded to a user's Microsoft account. This bug only affects Thunderbird for Windows     10+ with Cloud Clipboard enabled. Other operating systems are unaffected. (CVE-2021-38505)

  - Through a series of web navigations, Thunderbird could have entered fullscreen mode without notification     or warning to the user. This could lead to spoofing attacks on the browser UI including phishing.
    (CVE-2021-38506)

  - The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded     to TLS while retaining the visual properties of an HTTP connection, including being same-origin with     unencrypted connections on port 80.  However, if a second encrypted port on the same IP address (e.g. port     8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the     browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin     with HTTP.  This was resolved by disabling the Opportunistic Encryption feature, which had low usage.
    (CVE-2021-38507)

  - By displaying a form validity message in the correct location at the same time as a permission prompt     (such as for geolocation), the validity message could have obscured the prompt, resulting in the user     potentially being tricked into granting the permission. (CVE-2021-38508)

  - Due to an unusual sequence of attacker-controlled events, a Javascript <code>alert()</code> dialog with     arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the     attacker's choosing. (CVE-2021-38509)

  - The executable file warning was not presented when downloading .inetloc files, which, due to a flaw in Mac     OS, can run commands on a user's computer. Note: This issue only affected Mac OS operating systems. Other     operating systems are unaffected. (CVE-2021-38510)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
206859	NewStart CGSL MAIN 6.02 : firefox Multiple Vulnerabilities (NS-SA-2024-0066)	Nessus	NewStart CGSL Local Security Checks	critical
174073	NewStart CGSL CORE 5.05 / MAIN 5.05 : firefox Multiple Vulnerabilities (NS-SA-2023-0009)	Nessus	NewStart CGSL Local Security Checks	critical
157736	Rocky Linux 8 : firefox (RLSA-2021:4123)	Nessus	Rocky Linux Local Security Checks	critical
156961	Ubuntu 18.04 LTS / 20.04 LTS : Thunderbird vulnerabilities (USN-5248-1)	Nessus	Ubuntu Local Security Checks	critical
156457	Debian DLA-2874-1 : thunderbird - LTS security update	Nessus	Debian Local Security Checks	critical
156451	Debian DSA-5034-1 : thunderbird - security update	Nessus	Debian Local Security Checks	critical
156385	Debian DLA-2863-1 : firefox-esr - LTS security update	Nessus	Debian Local Security Checks	critical
156191	Debian DSA-5026-1 : firefox-esr - security update	Nessus	Debian Local Security Checks	critical
155539	CentOS 7 : firefox (RHSA-2021:4116)	Nessus	CentOS Local Security Checks	critical
155538	CentOS 7 : thunderbird (RHSA-2021:4134)	Nessus	CentOS Local Security Checks	critical
155075	RHEL 8 : firefox (RHSA-2021:4607)	Nessus	Red Hat Local Security Checks	critical
155023	RHEL 8 : firefox (RHSA-2021:4605)	Nessus	Red Hat Local Security Checks	critical
154947	RHEL 8 : thunderbird (RHSA-2021:4132)	Nessus	Red Hat Local Security Checks	critical
154944	RHEL 8 : thunderbird (RHSA-2021:4130)	Nessus	Red Hat Local Security Checks	critical
154943	RHEL 7 : thunderbird (RHSA-2021:4134)	Nessus	Red Hat Local Security Checks	critical
154942	RHEL 8 : thunderbird (RHSA-2021:4133)	Nessus	Red Hat Local Security Checks	critical
154909	RHEL 8 : firefox (RHSA-2021:4123)	Nessus	Red Hat Local Security Checks	critical
154891	RHEL 7 : firefox (RHSA-2021:4116)	Nessus	Red Hat Local Security Checks	critical
154876	Mozilla Thunderbird < 91.3	Nessus	MacOS X Local Security Checks	critical
154875	Mozilla Thunderbird < 91.3	Nessus	Windows	critical

Detections

Analytics

CVE-2021-43534

high

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical