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CVE-2021-43527

Published: 1 December 2021

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. This vulnerability affects NSS < 3.73 and NSS < 3.68.1.

Notes

AuthorNote
mdeslaur
thunderbird 91.3.0 already shipped a work-around for this issue,
which is now known as CVE-2021-43529, but thunderbird 91.4.0
will also fix the nss issue to prevent secondary attack vectors.

Priority

High

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
nss
Launchpad, Ubuntu, Debian
kinetic
Released (2:3.68-1ubuntu2)
lunar
Released (2:3.68-1ubuntu2)
bionic
Released (2:3.35-2ubuntu2.13)
focal
Released (2:3.49.1-1ubuntu1.6)
hirsute
Released (2:3.61-1ubuntu2.1)
impish
Released (2:3.68-1ubuntu1.1)
jammy
Released (2:3.68-1ubuntu2)
upstream
Released (3.68.1, 3.73)
thunderbird
Launchpad, Ubuntu, Debian
kinetic
Released (1:91.4.0+build1.1-0ubuntu1)
lunar
Released (1:91.4.0+build1.1-0ubuntu1)
upstream
Released (91.4.0)
xenial Ignored
(end of standard support, was needed)
bionic
Released (1:78.14.0+build1-0ubuntu0.18.04.2)
focal
Released (1:78.14.0+build1-0ubuntu0.20.04.2)
hirsute
Released (1:78.14.0+build1-0ubuntu0.21.04.2)
impish
Released (1:91.3.1+build1-0ubuntu0.21.10.2)
trusty Does not exist

jammy
Released (1:91.4.0+build1.1-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H