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AUSCERT External Security Bulletin Redistribution
MFSA 2020-35 Security Vulnerabilities fixed in Thunderbird 68.11
31 July 2020
AusCERT Security Bulletin Summary
Product: Thunderbird 68.11
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
CVE Names: CVE-2020-15659 CVE-2020-15652 CVE-2020-6514
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Mozilla Foundation Security Advisory 2020-35
Security Vulnerabilities fixed in Thunderbird 68.11
July 30, 2020
In general, these flaws cannot be exploited through email in the Thunderbird
product because scripting is disabled when reading mail, but are potentially
risks in browser or browser-like contexts.
# 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-2020-6463: 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-2020-15659: Memory safety bugs fixed in Thunderbird 68.11
Mozilla developers Jason Kratzer and Luke Wagner reported memory safety bugs
present in Thunderbird 68.10. 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 Thunderbird 68.11
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