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AUSCERT External Security Bulletin Redistribution
MFSA 2020-32 Security Vulnerabilities fixed in Firefox ESR 78.1
29 July 2020
AusCERT Security Bulletin Summary
Product: Firefox ESR
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
CVE Names: CVE-2020-15659 CVE-2020-15658 CVE-2020-15657
CVE-2020-15656 CVE-2020-15655 CVE-2020-15654
CVE-2020-15653 CVE-2020-15652 CVE-2020-6514
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Mozilla Foundation Security Advisory 2020-32
Security Vulnerabilities fixed in Firefox ESR 78.1
July 28, 2020
Firefox ESR 78.1
# CVE-2020-15652: Potential leak of redirect targets when loading scripts in a
possible to leak the result of a cross-origin redirect. This applied only to
content that can be parsed as script.
o Bug 1634872
# CVE-2020-6514: WebRTC data channel leaks internal address to peer
Natalie Silvanovich of Google Project Zero
WebRTC used the memory address of a class instance as a connection identifier.
Unfortunately, this value is often transmitted to the peer, which allows
o Bug 1642792
# CVE-2020-15655: Extension APIs could be used to bypass Same-Origin Policy
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.
o Bug 1645204
# CVE-2020-15653: Bypassing iframe sandbox when allowing popups
Anne van Kesteren
Mozilla developer Anne van Kesteren discovered that <iframe sandbox> with the
allow-popups flag could be bypassed when using noopener links. This could have
led to security issues for websites relying on sandbox configurations that
allowed popups and hosted arbitrary content.
o Bug 1521542
# CVE-2020-6463: Use-after-free in ANGLE gl::Texture::onUnbindAsSamplerTexture
Reported by Pawel Wylecial of REDTEAM.PL
Crafted media files could lead to a race in texture caches, resulting in a
use-after-free, memory corruption, and a potentially exploitable crash.
o Bug 1635293
# CVE-2020-15656: Type confusion for special arguments in IonMonkey
Carl Smith, working with Google Project Zero
optimizations. This risk was already mitigated by various precautions in the
code, resulting in this bug rated at only moderate severity.
o Bug 1647293
# CVE-2020-15658: Overriding file type when saving to disk
The code for downloading files did not properly take care of special
characters, which led to an attacker being able to cut off the file ending at
an earlier position, leading to a different file type being downloaded than
shown in the dialog.
o Bug 1637745
# CVE-2020-15657: DLL hijacking due to incorrect loading path
Steve Nyan Lin
Firefox could be made to load attacker-supplied DLL files from the installation
directory. This required an attacker that is already capable of placing files
in the installation directory.
Note: This issue only affected Windows operating systems. Other operating
systems are unaffected.
o Bug 1644954
# CVE-2020-15654: Custom cursor can overlay user interface
SophosLabs Offensive Security team
When in an endless loop, a website specifying a custom cursor using CSS could
make it look like the user is interacting with the user interface, when they
are not. This could lead to a perceived broken state, especially when
interactions with existing browser dialogs and warnings do not work.
o Bug 1648333
# CVE-2020-15659: Memory safety bugs fixed in Firefox 79 and Firefox ESR 78.1
Mozilla developers and community
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.
o Memory safety bugs fixed in Firefox 79 and Firefox ESR 78.1
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