Mozilla developers reported memory safety bugs present in Firefox 92. 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.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5107-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, spoof another     origin, or execute arbitrary code.

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 version of Firefox installed on the remote Windows host is prior to 93.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-43 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. (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. (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. (CVE-2021-38498)

  - In the crossbeam crate, one or more tasks in the worker queue could have been be popped twice instead of     other tasks that are forgotten and never popped. If tasks are allocated on the heap, this could have     caused a double free and a memory leak. (CVE-2021-32810)

  - Mozilla developers and community members Andreas Pehrson and Christian Holler 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.
    (CVE-2021-38500)

  - Mozilla developers and community members Kevin Brosnan, Mihai Alexandru Michis, and Christian Holler     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. (CVE-2021-38501)

  - Mozilla developers and community members Julien Cristau, Christian Holler reported memory safety bugs     present in Firefox 92. 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-2021-38499)

Note that Nessus has not tested for this issue 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 93.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2021-43 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. (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. (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. (CVE-2021-38498)

  - In the crossbeam crate, one or more tasks in the worker queue could have been be popped twice instead of     other tasks that are forgotten and never popped. If tasks are allocated on the heap, this could have     caused a double free and a memory leak. (CVE-2021-32810)

  - Mozilla developers and community members Andreas Pehrson and Christian Holler 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.
    (CVE-2021-38500)

  - Mozilla developers and community members Kevin Brosnan, Mihai Alexandru Michis, and Christian Holler     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. (CVE-2021-38501)

  - Mozilla developers and community members Julien Cristau, Christian Holler reported memory safety bugs     present in Firefox 92. 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-2021-38499)

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

ID	Name	Product	Family	Severity
153925	Ubuntu 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-5107-1)	Nessus	Ubuntu Local Security Checks	critical
153881	Mozilla Firefox < 93.0	Nessus	Windows	critical
153880	Mozilla Firefox < 93.0	Nessus	MacOS X Local Security Checks	critical

Detections

Analytics

CVE-2021-38499

high

Tenable Plugins

critical

critical

critical