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CVE-2021-43527

Publication date 1 December 2021

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
nss 23.04 lunar
Fixed 2:3.68-1ubuntu2
22.10 kinetic
Fixed 2:3.68-1ubuntu2
22.04 LTS jammy
Fixed 2:3.68-1ubuntu2
21.10 impish
Fixed 2:3.68-1ubuntu1.1
21.04 hirsute
Fixed 2:3.61-1ubuntu2.1
20.04 LTS focal
Fixed 2:3.49.1-1ubuntu1.6
18.04 LTS bionic
Fixed 2:3.35-2ubuntu2.13
16.04 LTS xenial
14.04 LTS trusty
thunderbird 23.04 lunar
Fixed 1:91.4.0+build1.1-0ubuntu1
22.10 kinetic
Fixed 1:91.4.0+build1.1-0ubuntu1
22.04 LTS jammy
Fixed 1:91.4.0+build1.1-0ubuntu1
21.10 impish
Fixed 1:91.3.1+build1-0ubuntu0.21.10.2
21.04 hirsute
Fixed 1:78.14.0+build1-0ubuntu0.21.04.2
20.04 LTS focal
Fixed 1:78.14.0+build1-0ubuntu0.20.04.2
18.04 LTS bionic
Fixed 1:78.14.0+build1-0ubuntu0.18.04.2
16.04 LTS xenial Ignored end of standard support, was needed
14.04 LTS trusty Not in release

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Notes

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.

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
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

References

Related Ubuntu Security Notices (USN)

Other references