Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code or information disclosure.

For Debian 9 stretch, these problems have been fixed in version 78.7.0esr-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

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote CentOS Linux 7 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2021:0290 advisory.

  - When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former,     the service worker could have intercepted the request for the secure page despite the iframe not being a     secure context due to the (insecure) framing. This vulnerability affects Firefox < 84. (CVE-2020-26976)

  - If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-     origin information, when said information is served as chunked data. This vulnerability affects Firefox <     85, Thunderbird < 78.7, and Firefox ESR < 78.7. (CVE-2021-23953)

  - Using the new logical assignment operators in a JavaScript switch statement could have caused a type     confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects     Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7. (CVE-2021-23954)

  - Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a     potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox     ESR < 78.7. (CVE-2021-23960)

  - Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 < 85, Thunderbird < 78.7, and     Firefox ESR < 78.7. (CVE-2021-23964)

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 78.7. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-05 advisory.

  - Mozilla developers Alexis Beingessner, Christian Holler, Andrew McCreight, Tyson Smith, Jon Coppeard,     Andr Bargull, Jason Kratzer, Jesse Schwartzentruber, Steve Fink, Byron Campen reported memory safety     bugs present in Thunderbird 78.6. 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. (CVE-2021-23964)

  - If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-     origin information, when said information is served as chunked data. (CVE-2021-23953)

  - Using the new logical assignment operators in a JavaScript switch statement could have caused a type     confusion, leading to a memory corruption and a potentially exploitable crash. (CVE-2021-23954)

  - During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected     and evaluated within the encrypted session. (CVE-2020-15685)

  - When a HTTPS page was embedded in a HTTP page, and there was a service worker registered for the former,     the service worker could have intercepted the request for the secure page despite the iframe not being a     secure context due to the (insecure) framing. (CVE-2020-26976)

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

This update for MozillaThunderbird fixes the following issues :

  - Mozilla Thunderbird was updated to 78.7.0 ESR (MFSA     2021-05, bsc#1181414)

  - CVE-2021-23953: Fixed a Cross-origin information leakage     via redirected PDF requests

  - CVE-2021-23954: Fixed a type confusion when using     logical assignment operators in JavaScript switch     statements

  - CVE-2020-26976: Fixed an issue where HTTPS pages could     have been intercepted by a registered service worker     when they should not have been

  - CVE-2021-23960: Fixed a use-after-poison for incorrectly     redeclared JavaScript variables during GC

  - CVE-2021-23964: Fixed Memory safety bugs

  - CVE-2020-15685: Fixed an IMAP Response Injection when     using STARTTLS This update was imported from the     SUSE:SLE-15:Update update project.

The remote Oracle Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2021-0298 advisory.

    [78.7.0-1.0.1]
    - Replaced thunderbird-redhat-default-prefs.js with thunderbird-oracle-default-prefs.js

    [78.7.0-1]
    - Update to 78.7.0

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 MiracleLinux 4 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2021-1432:01 advisory.

    Mozilla: Cross-origin information leakage via redirected PDF requests     (CVE-2021-23953)         Mozilla: Type confusion when using logical assignment operators in     JavaScript switch statements (CVE-2021-23954)         Mozilla: Memory safety bugs fixed in Firefox 85 and Firefox ESR 78.7     (CVE-2021-23964)         Mozilla: IMAP Response Injection when using STARTTLS (CVE-2020-15685)         Mozilla: HTTPS pages could have been intercepted by a registered service     worker when they should not have been (CVE-2020-26976)         Mozilla: Use-after-poison for incorrectly redeclared JavaScript variables     during GC (CVE-2021-23960)

Tenable has extracted the preceding description block directly from the MiracleLinux 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-2021:0297 advisory.

  - During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected     and evaluated within the encrypted session. This vulnerability affects Thunderbird < 78.7.
    (CVE-2020-15685)

  - When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former,     the service worker could have intercepted the request for the secure page despite the iframe not being a     secure context due to the (insecure) framing. This vulnerability affects Firefox < 84. (CVE-2020-26976)

  - If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-     origin information, when said information is served as chunked data. This vulnerability affects Firefox <     85, Thunderbird < 78.7, and Firefox ESR < 78.7. (CVE-2021-23953)

  - Using the new logical assignment operators in a JavaScript switch statement could have caused a type     confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects     Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7. (CVE-2021-23954)

  - Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a     potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox     ESR < 78.7. (CVE-2021-23960)

  - Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. 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 < 85, Thunderbird < 78.7, and     Firefox ESR < 78.7. (CVE-2021-23964)

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
146163	Debian DLA-2539-1 : firefox-esr security update	Nessus	Debian Local Security Checks	2/4/2021	3/8/2021	high
208615	CentOS 7 : firefox (RHSA-2021:0290)	Nessus	CentOS Local Security Checks	10/9/2024	10/9/2024	high
145468	Mozilla Thunderbird < 78.7	Nessus	Windows	1/27/2021	11/18/2025	high
145746	openSUSE Security Update : MozillaThunderbird (openSUSE-2021-209)	Nessus	SuSE Local Security Checks	2/1/2021	1/25/2024	high
146565	Oracle Linux 8 : thunderbird (ELSA-2021-0298)	Nessus	Oracle Linux Local Security Checks	2/17/2021	10/22/2024	high
294665	MiracleLinux 4 : thunderbird-78.7.0-1.0.1.AXS4 (AXSA:2021-1432:01)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high
208628	CentOS 7 : thunderbird (RHSA-2021:0297)	Nessus	CentOS Local Security Checks	10/9/2024	10/9/2024	high

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