The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A redirected HTTP request which is observed or modified through a web extension could bypass existing CORS     checks, leading to potential disclosure of cross-origin information. This vulnerability affects Firefox     ESR < 78.1, Firefox < 79, and Thunderbird < 78.1. (CVE-2020-15655)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 79.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-30 advisory.

  - Mozilla developers and community members Kevin Brosnan, Alexandru Michis, Natalia Csoregi, Jason Kratzer,     Christian Holler, Simon Giesecke, Luke Wagner reported memory safety bugs present in Firefox 78. 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-2020-15659)

  - Crafted media files could lead to a race in texture caches, resulting in a use-after-free, memory     corruption, and a potentially exploitable crash. (CVE-2020-6463)

  - By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a     cross-origin redirect. This applied only to content that can be parsed as script. (CVE-2020-15652)

  - WebRTC used the memory address of a class instance as a connection identifier. Unfortunately, this value     is often transmitted to the peer, which allows bypassing ASLR. (CVE-2020-6514)

  - Mozilla Developer Rob Wu discovered that a redirected HTTP request which is observed or modified through a     web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin     information. (CVE-2020-15655)

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 ESR installed on the remote Windows host is prior to 78.1. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2020-32 advisory.

  - Mozilla developers and community members Natalia Csoregi, Simon Giesecke, Jason Kratzer, Christian Holler,     and Luke Wagner reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. 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-2020-15659)

  - Crafted media files could lead to a race in texture caches, resulting in a use-after-free, memory     corruption, and a potentially exploitable crash. (CVE-2020-6463)

  - By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a     cross-origin redirect. This applied only to content that can be parsed as script. (CVE-2020-15652)

  - WebRTC used the memory address of a class instance as a connection identifier. Unfortunately, this value     is often transmitted to the peer, which allows bypassing ASLR. (CVE-2020-6514)

  - Mozilla Developer Rob Wu discovered that a redirected HTTP request which is observed or modified through a     web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin     information. (CVE-2020-15655)

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 MozillaFirefox fixes the following issues :

  - Firefox Extended Support Release 78.1.0 ESR

  - Fixed: Various stability, functionality, and security     fixes (bsc#1174538)

  - CVE-2020-15652: Potential leak of redirect targets when     loading scripts in a worker

  - CVE-2020-6514: WebRTC data channel leaks internal     address to peer

  - CVE-2020-15655: Extension APIs could be used to bypass     Same-Origin Policy

  - CVE-2020-15653: Bypassing iframe sandbox when allowing     popups

  - CVE-2020-6463: Use-after-free in ANGLE     gl::Texture::onUnbindAsSamplerTexture

  - CVE-2020-15656: Type confusion for special arguments in     IonMonkey

  - CVE-2020-15658: Overriding file type when saving to disk

  - CVE-2020-15657: DLL hijacking due to incorrect loading     path

  - CVE-2020-15654: Custom cursor can overlay user interface

  - CVE-2020-15659: Memory safety bugs fixed in Firefox 79     and Firefox ESR 78.1

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

ID	名稱	產品	系列	已發布	已更新	嚴重性
244300	Linux Distros Unpatched Vulnerability : CVE-2020-15655	Nessus	Misc.	2025/8/6	2026/7/28	medium
139039	Mozilla Firefox < 79.0	Nessus	MacOS X Local Security Checks	2020/7/28	2025/11/18	high
139074	Mozilla Firefox ESR < 78.1	Nessus	Windows	2020/7/29	2025/11/18	high
139444	openSUSE Security Update : MozillaFirefox (openSUSE-2020-1155)	Nessus	SuSE Local Security Checks	2020/8/10	2024/2/26	high

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