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AUSCERT External Security Bulletin Redistribution
ESB-2021.3298
MFSA 2021-44 and MFSA 2021-45 Security Vulnerabilities fixed in Firefox ESR
6 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox ESR
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
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-38501 CVE-2021-38500 CVE-2021-38498
CVE-2021-38497 CVE-2021-38496 CVE-2021-32810
Reference: ESB-2021.3297
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2021-44
https://www.mozilla.org/en-US/security/advisories/mfsa2021-45
Comment: This bulletin contains two (2) Mozilla security advisories.
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Mozilla Foundation Security Advisory 2021-44
Security Vulnerabilities fixed in Firefox ESR 78.15
Announced: October 5, 2021
Impact: high
Products: Firefox ESR
Fixed in: Firefox ESR 78.15
# CVE-2021-38496: Use-after-free in MessageTask
Reporter: Yangkang of 360 ATA Team
Impact: high
Description
During operations on MessageTasks, a task may have been removed while it was
still scheduled, resulting in memory corruption and a potentially exploitable
crash.
References
o Bug 1725335
# CVE-2021-38500: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and
Firefox ESR 91.2
Reporter: Mozilla developers
Impact: high
Description
Mozilla developers and community members Andreas Pehrson and Christian Holler
reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. 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 Firefox 93, Firefox ESR 78.15, and Firefox ESR
91.2
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Mozilla Foundation Security Advisory 2021-45
Security Vulnerabilities fixed in Firefox ESR 91.2
Announced: October 5, 2021
Impact: high
Products: Firefox ESR
Fixed in: Firefox ESR 91.2
# CVE-2021-38496: Use-after-free in MessageTask
Reporter: Yangkang of 360 ATA Team
Impact: high
Description
During operations on MessageTasks, a task may have been removed while it was
still scheduled, resulting in memory corruption and a potentially exploitable
crash.
References
o Bug 1725335
# CVE-2021-38497: Validation message could have been overlaid on another origin
Reporter: Irvan Kurniawan
Impact: moderate
Description
Through use of reportValidity() and window.open(), a plain-text validation
message could have been overlaid on another origin, leading to possible user
confusion and spoofing attacks.
References
o Bug 1726621
# CVE-2021-38498: Use-after-free of nsLanguageAtomService object
Reporter: Yangkang of 360 ATA Team
Impact: moderate
Description
During process shutdown, a document could have caused a use-after-free of a
languages service object, leading to memory corruption and a potentially
exploitable crash.
References
o Bug 1729642
# CVE-2021-32810: Data race in crossbeam-deque
Reporter: Maor Kleinberger
Impact: moderate
Description
In the crossbeam crate, one or more tasks in the worker queue could have been
be popped twice instead of other tasks that are forgotten and never popped. If
tasks are allocated on the heap, this could have caused a double free and a
memory leak.
References
o Bug 1729813
o Bug https://github.com/crossbeam-rs/crossbeam/security/advisories/
GHSA-pqqp-xmhj-wgcw
# CVE-2021-38500: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and
Firefox ESR 91.2
Reporter: Mozilla developers
Impact: high
Description
Mozilla developers and community members Andreas Pehrson and Christian Holler
reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. 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 Firefox 93, Firefox ESR 78.15, and Firefox ESR
91.2
# CVE-2021-38501: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2
Reporter: Mozilla developers
Impact: high
Description
Mozilla developers and community members Kevin Brosnan, Mihai Alexandru Michis,
and Christian Holler reported memory safety bugs present in Firefox 92 and
Firefox ESR 91.1. 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 Firefox 93 and Firefox ESR 91.2
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