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AUSCERT External Security Bulletin Redistribution
ESB-2021.4065
MFSA 2021-51 Memory corruption in NSS via DER-encoded DSA
and RSA-PSS signatures
2 December 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Network Security Services
Publisher: Mozilla
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-43527
Reference: ESB-2021.4061
Original Bulletin:
https://www.mozilla.org/en-US/security/advisories/mfsa2021-51/
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Mozilla Foundation Security Advisory 2021-51
Memory corruption in NSS via DER-encoded DSA and RSA-PSS signatures
Announced: December 1, 2021
Impact: critical
Products: NSS
Fixed in: NSS 3.68.1
NSS 3.73
# CVE-2021-43527: Memory corruption via DER-encoded DSA and RSA-PSS signatures
Reporter: Tavis Ormandy of Google Project Zero
Impact: critical
Description
NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are
vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS
signatures. Applications using NSS for handling signatures encoded within CMS,
S/MIME, PKCS #7, or PKCS #12 are likely to be impacted. Applications using NSS
for certificate validation or other TLS, X.509, OCSP or CRL functionality may
be impacted, depending on how they configure NSS.
Note: This vulnerability does NOT impact Mozilla Firefox. However, email
clients and PDF viewers that use NSS for signature verification, such as
Thunderbird, LibreOffice, Evolution and Evince are believed to be impacted.
References
o Bug 1737470
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