When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer, for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed message for the signature validity. This gave the false impression that the additional contents were also covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that belongs to the top level MIME part will be considered for the displayed status. This vulnerability affects Thunderbird < 91.4.1.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer,
    for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed
    message for the signature validity. This gave the false impression that the additional contents were also
    covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that
    belongs to the top level MIME part will be considered for the displayed status. This vulnerability affects
    Thunderbird < 91.4.1. (CVE-2021-4126)

  - 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)

The remote Ubuntu 21.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5246-1 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, conduct spoofing attacks, bypass security restrictions, or execute     arbitrary code. (CVE-2021-4129, CVE-2021-4140, 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 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 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 SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2022:0058-1 advisory.

  - When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer,     for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed     message for the signature validity. This gave the false impression that the additional contents were also     covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that     belongs to the top level MIME part will be considered for the displayed status.  (CVE-2021-4126)

  - 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0058-1 advisory.

    - Mozilla Thunderbird 91.4.1
    - CVE-2021-4126: OpenPGP signature status doesn't consider additional message content. (bsc#1194215)
    - CVE-2021-44538: Matrix chat library libolm bundled with Thunderbird vulnerable to a buffer overflow.
    (bsc#1194020)

Tenable has extracted the preceding description block directly from the SUSE 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 version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 91.4.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-55 advisory.

  - Thunderbird users who use the Matrix chat protocol were vulnerable to a buffer overflow in libolm, that an     attacker may trigger by a crafted sequence of  messages. The overflow content is partially controllable by     the attacker and limited to ASCII spaces and digits. (CVE-2021-44538)

  - When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer,     for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed     message for the signature validity. This gave the false impression that the additional contents were also     covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that     belongs to the top level MIME part will be considered for the displayed status. (CVE-2021-4126)

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 Windows host is prior to 91.4.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-55 advisory.

  - Thunderbird users who use the Matrix chat protocol were vulnerable to a buffer overflow in libolm, that an     attacker may trigger by a crafted sequence of  messages. The overflow content is partially controllable by     the attacker and limited to ASCII spaces and digits. (CVE-2021-44538)

  - When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer,     for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed     message for the signature validity. This gave the false impression that the additional contents were also     covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that     belongs to the top level MIME part will be considered for the displayed status. (CVE-2021-4126)

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

ID	Name	Product	Family	Severity
426397	Alpine: thunderbird: security update to 91.4.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
426397	Alpine: thunderbird: security update to 91.4.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
156962	Ubuntu 21.10 : Thunderbird vulnerabilities (USN-5246-1)	Nessus	Ubuntu Local Security Checks	critical
156961	Ubuntu 18.04 LTS / 20.04 LTS : Thunderbird vulnerabilities (USN-5248-1)	Nessus	Ubuntu Local Security Checks	critical
156721	openSUSE 15 Security Update : MozillaThunderbird (openSUSE-SU-2022:0058-1)	Nessus	SuSE Local Security Checks	critical
156709	SUSE SLED15: MozillaThunderbird / MozillaThunderbird-translations-common / etc (SUSE-SU-2022:0058-1)	Nessus	SuSE 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
156196	Mozilla Thunderbird < 91.4.1	Nessus	MacOS X Local Security Checks	critical
156195	Mozilla Thunderbird < 91.4.1	Nessus	Windows	critical

Detections

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CVE-2021-4126

medium

Tenable Plugins

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