The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:3840 advisory.

    Mozilla Thunderbird is a standalone mail and newsgroup client.

    This update upgrades Thunderbird to version 91.2.0.

    Security Fix(es):

    * Mozilla: Use-after-free in MessageTask (CVE-2021-38496)

    * Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2     (CVE-2021-38500)

    * Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)

    * Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)

    * rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)

    * Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)

    * Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

    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 CentOS Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the CESA-2021:3838 advisory.

  - rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)

  - Mozilla: Use-after-free in MessageTask (CVE-2021-38496)

  - Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)

  - Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

  - Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2 (CVE-2021-38500)

  - Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)

  - Mozilla: Downgrade attack on SMTP STARTTLS connections (CVE-2021-38502)

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 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3451-1 advisory.

    This update contains the Firefox Extended Support Release 91.2.0 ESR.

    Release 91.2.0 ESR:

    * Fixed: Various stability, functionality, and security fixes

    MFSA 2021-45 (bsc#1191332):

    * CVE-2021-38496: Use-after-free in MessageTask
    * CVE-2021-38497: Validation message could have been overlaid on another origin
    * CVE-2021-38498: Use-after-free of nsLanguageAtomService object
    * CVE-2021-32810: Fixed Data race in crossbeam-deque
    * CVE-2021-38500: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2
    * CVE-2021-38501: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2

    - Fixed crash in FIPS mode (bsc#1190710)

    Release 91.1.0 ESR:

    * Fixed: Various stability, functionality, and security fixes

    MFSA 2021-40 (bsc#1190269, bsc#1190274):

    * CVE-2021-38492: Navigating to `mk:` URL scheme could load Internet Explorer
    * CVE-2021-38495: Memory safety bugs fixed in Firefox 92 and Firefox ESR 91.1

    Release 91.0.1esr ESR:

    * Fixed: Fixed an issue causing buttons on the tab bar to be       resized when loading certain websites (bug 1704404)
    * Fixed: Fixed an issue which caused tabs from private windows       to be visible in non-private windows when viewing switch-to-       tab results in the address bar panel (bug 1720369)
    * Fixed: Various stability fixes
    * Fixed: Security fix MFSA 2021-37 (bsc#1189547)
    * CVE-2021-29991 (bmo#1724896)       Header Splitting possible with HTTP/3 Responses

    Firefox Extended Support Release 91.0 ESR

    * New: Some of the highlights of the new Extended Support Release are:

      - A number of user interface changes. For more information,         see the Firefox 89 release notes.
      - Firefox now supports logging into Microsoft, work, and         school accounts using Windows single sign-on. Learn more
      - On Windows, updates can now be applied in the background         while Firefox is not running.
      - Firefox for Windows now offers a new page about:third-party         to help identify compatibility issues caused by third-party         applications
      - Version 2 of Firefox's SmartBlock feature further improves         private browsing. Third party Facebook scripts are blocked to         prevent you from being tracked, but are now automatically         loaded 'just in time' if you decide to 'Log in with Facebook'         on any website.
      - Enhanced the privacy of the Firefox Browser's Private         Browsing mode with Total Cookie Protection, which confines         cookies to the site where they were created, preventing         companis from using cookies to track your browsing across         sites. This feature was originally launched in Firefox's ETP         Strict mode.
      - PDF forms now support JavaScript embedded in PDF files.
        Some PDF forms use JavaScript for validation and other         interactive features.
      - You'll encounter less website breakage in Private Browsing         and Strict Enhanced Tracking Protection with SmartBlock,         which provides stand-in scripts so that websites load         properly.
      - Improved Print functionality with a cleaner design and         better integration with your computer's printer settings.
      - Firefox now protects you from supercookies, a type of         tracker that can stay hidden in your browser and track you         online, even after you clear cookies. By isolating         supercookies, Firefox prevents them from tracking your web         browsing from one site to the next.
      - Firefox now remembers your preferred location for saved         bookmarks, displays the bookmarks toolbar by default on new         tabs, and gives you easy access to all of your bookmarks via         a toolbar folder.
      - Native support for macOS devices built with Apple Silicon         CPUs brings dramatic performance improvements over the non-         native build that was shipped in Firefox 83: Firefox launches         over 2.5 times faster and web apps are now twice as         responsive (per the SpeedoMeter 2.0 test). If you are on a         new Apple device, follow these steps to upgrade to the latest         Firefox.
      - Pinch zooming will now be supported for our users with         Windows touchscreen devices and touchpads on Mac devices.
        Firefox users may now use pinch to zoom on touch-capable         devices to zoom in and out of webpages.
      - Weve improved functionality and design for a number of         Firefox search features:
        * Selecting a search engine at the bottom of the search           panel now enters search mode for that engine, allowing you to           see suggestions (if available) for your search terms. The old           behavior (immediately performing a search) is available with           a shift-click.
        * When Firefox autocompletes the URL of one of your search           engines, you can now search with that engine directly in the           address bar by selecting the shortcut in the address bar           results.
        * Weve added buttons at the bottom of the search panel to           allow you to search your bookmarks, open tabs, and history.
      - Firefox supports AcroForm, which will allow you to fill in,         print, and save supported PDF forms and the PDF viewer also         has a new fresh look.
      - For our users in the US and Canada, Firefox can now save,         manage, and auto-fill credit card information for you, making         shopping on Firefox ever more convenient.
      - In addition to our default, dark and light themes, with         this release, Firefox introduces the Alpenglow theme: a         colorful appearance for buttons, menus, and windows. You can         update your Firefox themes under settings or preferences.
    * Changed: Firefox no longer supports Adobe Flash. There is no       setting available to re-enable Flash support.
    * Enterprise: Various bug fixes and new policies have been       implemented in the latest version of Firefox. See more       details in the Firefox for Enterprise 91 Release Notes.

      MFSA 2021-33 (bsc#1188891):

    * CVE-2021-29986: Race condition when resolving DNS names could have led to       memory corruption
    * CVE-2021-29981: Live range splitting could have led to conflicting       assignments in the JIT
    * CVE-2021-29988: Memory corruption as a result of incorrect style treatment
    * CVE-2021-29983: Firefox for Android could get stuck in fullscreen mode
    * CVE-2021-29984: Incorrect instruction reordering during JIT optimization
    * CVE-2021-29980: Uninitialized memory in a canvas object could have led to       memory corruption
    * CVE-2021-29987: Users could have been tricked into accepting unwanted       permissions on Linux
    * CVE-2021-29985: Use-after-free media channels
    * CVE-2021-29982: Single bit data leak due to incorrect JIT optimization and       type confusion
    * CVE-2021-29989: Memory safety bugs fixed in Firefox 91 and Firefox ESR 78.13
    * CVE-2021-29990: Memory safety bugs fixed in Firefox 91

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 Oracle Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2021-3841 advisory.

    [91.2.0-1.0.1]
    - Replaced thunderbird-redhat-default-prefs.js with thunderbird-oracle-default-prefs.js

    [91.2.0-1]
    - Update to 91.2.0 build1

    [91.1.2-1]
    - Update to 91.1.2 build1

    [91.1.0-1]
    - Update to 91.1.0 build2

Tenable has extracted the preceding description block directly from the Oracle 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 SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1635-1 advisory.

  - An issue present in lowering/register allocation could have led to obscure but deterministic register     confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability     affects Firefox < 91 and Thunderbird < 91. (CVE-2021-29981)

  - Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object,     resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and     Thunderbird < 91. (CVE-2021-29982)

  - After requesting multiple permissions, and closing the first permission panel, subsequent permission     panels will be displayed in a different position but still record a click in the default location, making     it possible to trick a user into accepting a permission they did not want to. *This bug only affects     Firefox on Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox < 91 and     Thunderbird < 91. (CVE-2021-29987)

  - Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This     allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox <     91.0.1 and Thunderbird < 91.0.1. (CVE-2021-29991)

  - 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)

  - When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might     allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. *This bug     only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects     Firefox < 92, Thunderbird < 91.1, Thunderbird < 78.14, Firefox ESR < 78.14, and Firefox ESR < 91.1.
    (CVE-2021-38492)

  - 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)

  - Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. 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 < 91.1 and Firefox ESR < 91.1.
    (CVE-2021-38495)

  - 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)

  - 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)

  - 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 Firefox before versions 94 and ESR 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 Firefox for     Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.*. This vulnerability     affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3. (CVE-2021-38505)

  - 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)

  - 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.*. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and     Firefox ESR < 91.3. (CVE-2021-38510)

  - The ElGamal implementation in Botan through 2.18.1, as used in Thunderbird and other products, allows     plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous     combination of the prime defined by the receiver's public key, the generator defined by the receiver's     public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.
    (CVE-2021-40529)

  - 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)

  - 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)

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.

ID	Name	Product	Family	Published	Updated	Severity
154143	RHEL 8 : thunderbird (RHSA-2021:3840)	Nessus	Red Hat Local Security Checks	10/14/2021	11/7/2024	critical
154158	CentOS 8 : thunderbird (CESA-2021:3838)	Nessus	CentOS Local Security Checks	10/15/2021	5/9/2022	critical
154182	SUSE SLED15: MozillaFirefox / MozillaFirefox-branding-SLE / MozillaFirefox-devel / etc (SUSE-SU-2021:3451-1)	Nessus	SuSE Local Security Checks	10/17/2021	6/25/2026	critical
154353	Oracle Linux 7 : thunderbird (ELSA-2021-3841)	Nessus	Oracle Linux Local Security Checks	10/23/2021	10/22/2024	critical
156395	openSUSE 15 Security Update : MozillaThunderbird (openSUSE-SU-2021:1635-1)	Nessus	SuSE Local Security Checks	12/30/2021	3/6/2025	critical
156961	Ubuntu 18.04 LTS / 20.04 LTS : Thunderbird vulnerabilities (USN-5248-1)	Nessus	Ubuntu Local Security Checks	1/22/2022	3/6/2025	critical

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