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.

vendor_unpatched cve-2020-15684: Unpatched CVEs for Ubuntu Linux (cve-2020-15684)

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4599-2 advisory.

    USN-4599-1 fixed vulnerabilities in Firefox. This update provides the corresponding updates for Ubuntu     16.04 LTS.



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 remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4599-1 advisory.

    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, spoof the     prompt for opening an external application, obtain sensitive information, 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 macOS or Mac OS X host is prior to 82.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-45 advisory.

  - Crossbeam is a set of tools for concurrent programming. In crossbeam-channel before version 0.4.4, the     bounded channel incorrectly assumes that `Vec::from_iter` has allocated capacity that same as the number     of iterator elements. `Vec::from_iter` does not actually guarantee that and may allocate extra memory. The     destructor of the `bounded` channel reconstructs `Vec` from the raw pointer based on the incorrect assumes     described above. This is unsound and causing deallocation with the incorrect capacity when     `Vec::from_iter` has allocated different sizes with the number of iterator elements. This has been fixed     in crossbeam-channel 0.4.4. (CVE-2020-15254)

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 Windows host is prior to 82.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-45 advisory.

  - Crossbeam is a set of tools for concurrent programming. In crossbeam-channel before version 0.4.4, the     bounded channel incorrectly assumes that `Vec::from_iter` has allocated capacity that same as the number     of iterator elements. `Vec::from_iter` does not actually guarantee that and may allocate extra memory. The     destructor of the `bounded` channel reconstructs `Vec` from the raw pointer based on the incorrect assumes     described above. This is unsound and causing deallocation with the incorrect capacity when     `Vec::from_iter` has allocated different sizes with the number of iterator elements. This has been fixed     in crossbeam-channel 0.4.4. (CVE-2020-15254)

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
141923	Ubuntu 16.04 LTS : Firefox vulnerabilities (USN-4599-2)	Nessus	Ubuntu Local Security Checks	critical
141863	Ubuntu 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-4599-1)	Nessus	Ubuntu Local Security Checks	critical
141572	Mozilla Firefox < 82.0	Nessus	MacOS X Local Security Checks	critical
141571	Mozilla Firefox < 82.0	Nessus	Windows	critical

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