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AUSCERT External Security Bulletin Redistribution
MFSA 2022-21 Security Vulnerabilities fixed in Firefox ESR 91.10
1 June 2022
AusCERT Security Bulletin Summary
Product: Mozilla Firefox ESR
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
CVE Names: CVE-2022-31747 CVE-2022-31742 CVE-2022-31741
CVE-2022-31740 CVE-2022-31739 CVE-2022-31738
Comment: CVSS (Max): 7.5 CVE-2022-31747 (CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVSS Source: Red Hat
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Mozilla Foundation Security Advisory 2022-21
Security Vulnerabilities fixed in Firefox ESR 91.10
Announced: May 31, 2022
Products: Firefox ESR
Fixed in: Firefox ESR 91.10
# CVE-2022-31736: Cross-Origin resource's length leaked
Reporter: Luan Herrera
A malicious website could have learned the size of a cross-origin resource that
supported Range requests.
o Bug 1735923
# CVE-2022-31737: Heap buffer overflow in WebGL
Reporter: Atte Kettunen
A malicious webpage could have caused an out-of-bounds write in WebGL, leading
to memory corruption and a potentially exploitable crash.
o Bug 1743767
# CVE-2022-31738: Browser window spoof using fullscreen mode
Reporter: Irvan Kurniawan
When exiting fullscreen mode, an iframe could have confused the browser about
the current state of fullscreen, resulting in potential user confusion or
o Bug 1756388
# CVE-2022-31739: Attacker-influenced path traversal when saving downloaded
Reporter: Chaobin Zhang
When downloading files on Windows, the % character was not escaped, which could
have lead to a download incorrectly being saved to attacker-influenced paths
that used variables such as %HOMEPATH% or %APPDATA%.
This bug only affects Firefox for Windows. Other operating systems are
o Bug 1765049
# CVE-2022-31740: Register allocation problem in WASM on arm64
Reporter: Gary Kwong
On arm64, WASM code could have resulted in incorrect assembly generation
leading to a register allocation problem, and a potentially exploitable crash.
o Bug 1766806
# CVE-2022-31741: Uninitialized variable leads to invalid memory read
A crafted CMS message could have been processed incorrectly, leading to an
invalid memory read, and potentially further memory corruption.
o Bug 1767590
# CVE-2022-31742: Querying a WebAuthn token with a large number of
allowCredential entries may have leaked cross-origin information
An attacker could have exploited a timing attack by sending a large number of
allowCredential entries and detecting the difference between invalid key
handles and cross-origin key handles. This could have led to cross-origin
account linking in violation of WebAuthn goals.
o Bug 1730434
# CVE-2022-31747: Memory safety bugs fixed in Firefox 101 and Firefox ESR 91.10
Reporter: Mozilla developers and community
Mozilla developers Andrew McCreight, Nicolas B. Pierron, and the Mozilla
Fuzzing Team reported memory safety bugs present in Firefox 100 and Firefox ESR
91.9. 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
o Memory safety bugs fixed in Firefox 101 and Firefox ESR 91.10
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