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AUSCERT External Security Bulletin Redistribution
MFSA 2022-41 Security Vulnerabilities fixed in Firefox ESR 102.3
21 September 2022
AusCERT Security Bulletin Summary
Product: Mozilla Firefox ESR
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
CVE Names: CVE-2022-40962 CVE-2022-40960 CVE-2022-40959
CVE-2022-40958 CVE-2022-40957 CVE-2022-40956
Comment: CVSS (Max): None available when published
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Mozilla Foundation Security Advisory 2022-41
Security Vulnerabilities fixed in Firefox ESR 102.3
Announced: September 20, 2022
Products: Firefox ESR
Fixed in: Firefox ESR 102.3
# CVE-2022-40959: Bypassing FeaturePolicy restrictions on transient pages
Reporter: Armin Ebert
During iframe navigation, certain pages did not have their FeaturePolicy fully
initialized leading to a bypass that leaked device permissions into untrusted
o Bug 1782211
# CVE-2022-40960: Data-race when parsing non-UTF-8 URLs in threads
Reporter: Armin Ebert
Concurrent use of the URL parser with non-UTF-8 data was not thread-safe. This
could lead to a use-after-free causing a potentially exploitable crash.
o Bug 1787633
# CVE-2022-40958: Bypassing Secure Context restriction for cookies with __Host
and __Secure prefix
Reporter: Axel Chong (@Haxatron)
By injecting a cookie with certain special characters, an attacker on a shared
subdomain which is not a secure context could set and thus overwrite cookies
from a secure context, leading to session fixation and other attacks.
o Bug 1779993
# CVE-2022-40956: Content-Security-Policy base-uri bypass
Reporter: Satoki Tsuji
When injecting an HTML base element, some requests would ignore the CSP's
base-uri settings and accept the injected element's base instead.
o Bug 1770094
# CVE-2022-40957: Incoherent instruction cache when building WASM on ARM64
Reporter: Gary Kwong
Inconsistent data in instruction and data cache when creating wasm code could
lead to a potentially exploitable crash.
This bug only affects Firefox on ARM64 platforms.
o Bug 1777604
# CVE-2022-40962: Memory safety bugs fixed in Firefox 105 and Firefox ESR 102.3
Reporter: Mozilla developers and community
Mozilla developers Nika Layzell, Timothy Nikkel, Jeff Muizelaar, Sebastian
Hengst, Andreas Pehrson, and the Mozilla Fuzzing Team reported memory safety
bugs present in Firefox 104 and Firefox ESR 102.2. 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 105 and Firefox ESR 102.3
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