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MOZILLA FOUNDATION SECURITY ADVISORY 2021-43


SECURITY VULNERABILITIES FIXED IN FIREFOX 93

Announced October 5, 2021 Impact high Products Firefox Fixed in
 * Firefox 93

#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

 * 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

 * 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

 * 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

 * Bug 1729813
 * 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

 * 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

 * Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2

#CVE-2021-38499: MEMORY SAFETY BUGS FIXED IN FIREFOX 93

Reporter Mozilla developers and community Impact high

DESCRIPTION

Mozilla developers and community members Julien Cristau, Christian Holler
reported memory safety bugs present in Firefox 92. 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

 * Memory safety bugs fixed in Firefox 93

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