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AUSCERT External Security Bulletin Redistribution
ESB-2020.2623
MFSA 2020-35 Security Vulnerabilities fixed in Thunderbird 68.11
31 July 2020
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AusCERT Security Bulletin Summary
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Product: Thunderbird 68.11
Publisher: Mozilla
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
Resolution: Patch/Upgrade
CVE Names: CVE-2020-15659 CVE-2020-15652 CVE-2020-6514
CVE-2020-6463
Reference: ESB-2020.2605
ESB-2020.2580
ESB-2020.2579
ESB-2020.2578
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2020-35/
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Mozilla Foundation Security Advisory 2020-35
Security Vulnerabilities fixed in Thunderbird 68.11
Announced
July 30, 2020
Impact
high
Products
Thunderbird
Fixed in
Thunderbird 68.11
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
worker
Reporter
Mikhail Oblozhikhin
Impact
high
Description
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.
References
o Bug 1634872
# CVE-2020-6514: WebRTC data channel leaks internal address to peer
Reporter
Natalie Silvanovich of Google Project Zero
Impact
high
Description
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.
References
o Bug 1642792
# CVE-2020-6463: Use-after-free in ANGLE gl::Texture::onUnbindAsSamplerTexture
Reporter
Reported by Pawel Wylecial of REDTEAM.PL
Impact
moderate
Description
Crafted media files could lead to a race in texture caches, resulting in a
use-after-free, memory corruption, and a potentially exploitable crash.
References
o Bug 1635293
# CVE-2020-15659: Memory safety bugs fixed in Thunderbird 68.11
Reporter
Mozilla developers
Impact
high
Description
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.
References
o Memory safety bugs fixed in Thunderbird 68.11
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