Lack of escaping allowed HTML injection when a webpage was viewed in Reader View. While a Content Security Policy prevents direct code execution, HTML injection is still possible. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 88.

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

  - Mozilla developers and community members reported memory safety bugs present in Firefox 87. 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 < 88. (CVE-2021-29947)

  - A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound
    write. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
    (CVE-2021-23994)

  - When Responsive Design Mode was enabled, it used references to objects that were previously freed. We
    presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability
    affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88. (CVE-2021-23995)

  - By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's
    viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a
    user. This vulnerability affects Firefox < 88. (CVE-2021-23996)

  - Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the
    font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This
    vulnerability affects Firefox < 88. (CVE-2021-23997)

The version of Firefox installed on the remote Windows host is prior to 88.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-16 advisory.

  - Mozilla developers and community members Ryan VanderMeulen, Sean Feng, Tyson Smith, Julian Seward,     Christian Holler reported memory safety bugs present in Firefox 87. 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-2021-29947)

  - A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound     write. (CVE-2021-23994)

  - When Responsive Design Mode was enabled, it used references to objects that were previously freed. We     presume that with enough effort this could have been exploited to run arbitrary code. (CVE-2021-23995)

  - By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's     viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a     user. (CVE-2021-23996)

  - Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the     font cache. We presume that with enough effort this could have been exploited to run arbitrary code.
    (CVE-2021-23997)

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 Firefox installed on the remote macOS or Mac OS X host is prior to 88.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-16 advisory.

  - Mozilla developers and community members Ryan VanderMeulen, Sean Feng, Tyson Smith, Julian Seward,     Christian Holler reported memory safety bugs present in Firefox 87. 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-2021-29947)

  - A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound     write. (CVE-2021-23994)

  - When Responsive Design Mode was enabled, it used references to objects that were previously freed. We     presume that with enough effort this could have been exploited to run arbitrary code. (CVE-2021-23995)

  - By utilizing 3D CSS in conjunction with Javascript, content could have been rendered outside the webpage's     viewport, resulting in a spoofing attack that could have been used for phishing or other attacks on a     user. (CVE-2021-23996)

  - Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the     font cache. We presume that with enough effort this could have been exploited to run arbitrary code.
    (CVE-2021-23997)

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
427627	Alpine: multiple librewolf packages: security update to 88.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
427627	Alpine: multiple librewolf packages: security update to 88.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
404380	Alpine: multiple firefox packages: security update to 88.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
404380	Alpine: multiple firefox packages: security update to 88.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
148767	Mozilla Firefox < 88.0	Nessus	Windows	high
148766	Mozilla Firefox < 88.0	Nessus	MacOS X Local Security Checks	high

Detections

Analytics

CVE-2021-29944

medium

Tenable Plugins

high

high

high

high

high

high