CVE-2021-23964

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.

Mozilla Firefox is a standalone web browser, designed for standards compliance and performance. Its functionality can be enhanced via a plethora of extensions.

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

Security Fix(es):

Mozilla developers reported memory safety bugs present in Firefox for Android 79. 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 < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.(CVE-2020-15670)

Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. 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 < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.(CVE-2020-15673)

Mozilla developers reported memory safety bugs present in Firefox 80. 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 < 81.(CVE-2020-15674)

When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 81.(CVE-2020-15675)

If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.(CVE-2020-15680)

When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 82.(CVE-2020-15681)

When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in. An attacker could induce that prompt to be associated with an origin they didn't control, resulting in a spoofing attack. This was fixed by changing external protocol prompts to be tab-modal while also ensuring they could not be incorrectly associated with a different origin. This vulnerability affects Firefox < 82.(CVE-2020-15682)

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. 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 < 78.4, Firefox < 82, and Thunderbird < 78.4.(CVE-2020-15683)

Mozilla developers reported memory safety bugs present in Firefox 81. 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 < 82.(CVE-2020-15684)

Side-channel information leakage in graphics in Google Chrome prior to 87.0.4280.66 allowed a remote attacker to leak cross-origin data via a crafted HTML page.(CVE-2020-16012)

Use after free in WebRTC in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to potentially exploit heap corruption via a crafted SCTP packet.(CVE-2020-16044)

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.(CVE-2020-26950)

(CVE-2020-26951)

(CVE-2020-26953) …

Mozilla Firefox is a standalone web browser, designed for standards compliance and performance. Its functionality can be enhanced via a plethora of extensions.

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

Security Fix(es):

Mozilla developers reported memory safety bugs present in Firefox for Android 79. 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 < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.(CVE-2020-15670)

Mozilla developers reported memory safety bugs present in Firefox 80 and Firefox ESR 78.2. 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 < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.(CVE-2020-15673)

Mozilla developers reported memory safety bugs present in Firefox 80. 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 < 81.(CVE-2020-15674)

When processing surfaces, the lifetime may outlive a persistent buffer leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 81.(CVE-2020-15675)

If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.(CVE-2020-15680)

When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 82.(CVE-2020-15681)

When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in. An attacker could induce that prompt to be associated with an origin they didn't control, resulting in a spoofing attack. This was fixed by changing external protocol prompts to be tab-modal while also ensuring they could not be incorrectly associated with a different origin. This vulnerability affects Firefox < 82.(CVE-2020-15682)

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. 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 < 78.4, Firefox < 82, and Thunderbird < 78.4.(CVE-2020-15683)

Mozilla developers reported memory safety bugs present in Firefox 81. 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 < 82.(CVE-2020-15684)

Side-channel information leakage in graphics in Google Chrome prior to 87.0.4280.66 allowed a remote attacker to leak cross-origin data via a crafted HTML page.(CVE-2020-16012)

Use after free in WebRTC in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to potentially exploit heap corruption via a crafted SCTP packet.(CVE-2020-16044)

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.(CVE-2020-26950)

(CVE-2020-26951)

(CVE-2020-26953) …

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.

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).

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).

Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash (CVE-2021-23960).

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

Cross-origin information leakage via redirected PDF requests. (CVE-2021-23953)

Type confusion when using logical assignment operators in JavaScript switch statements. (CVE-2021-23954)

IMAP Response Injection when using STARTTLS. (CVE-2020-15685)

HTTPS pages could have been intercepted by a registered service worker when they should not have been. (CVE-2020-26976)

Use-after-poison for incorrectly redeclared JavaScript variables during GC. (CVE-2021-23960)

Memory safety bugs fixed in Thunderbird 78.7. (CVE-2021-23964).

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.

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.

This update for MozillaFirefox fixes the following issues:

• Firefox Extended Support Release 78.7.0 ESR (MFSA 2021-04, 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

This update was imported from the SUSE:SLE-15:Update update project.

This update for MozillaFirefox fixes the following issues:

• Firefox Extended Support Release 78.7.0 ESR (MFSA 2021-04, 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

This update was imported from the SUSE:SLE-15:Update update project.

These are all security issues fixed in the MozillaFirefox-92.0-1.2 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the MozillaThunderbird-91.1.1-1.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.

This update for MozillaFirefox fixes the following issues:

• Firefox Extended Support Release 78.7.0 ESR (MFSA 2021-04, 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

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 for MozillaFirefox fixes the following issues:

• Firefox Extended Support Release 78.7.0 ESR (MFSA 2021-04, 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

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 for MozillaFirefox fixes the following issues:

• Firefox Extended Support Release 78.7.0 ESR (MFSA 2021-04, 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

This update for MozillaFirefox fixes the following issues:

• Firefox Extended Support Release 78.7.0 ESR (MFSA 2021-04, 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

Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, conduct clickjacking attacks, or execute arbitrary code.