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
| Author | Note |
|---|---|
| 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
Status
| Package | Release | Status |
|---|---|---|
|
nss Launchpad, Ubuntu, Debian |
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)
|
|
| kinetic |
Released
(2:3.68-1ubuntu2)
|
|
| lunar |
Released
(2:3.68-1ubuntu2)
|
|
| trusty |
Released
(2:3.28.4-0ubuntu0.14.04.5+esm10)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Released
(3.68.1, 3.73)
|
|
| xenial |
Released
(2:3.28.4-0ubuntu0.16.04.14+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
|
thunderbird Launchpad, Ubuntu, Debian |
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)
|
|
| jammy |
Released
(1:91.4.0+build1.1-0ubuntu1)
|
|
| kinetic |
Released
(1:91.4.0+build1.1-0ubuntu1)
|
|
| lunar |
Released
(1:91.4.0+build1.1-0ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(91.4.0)
|
|
| xenial |
Ignored
(end of standard support, was needed)
|
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 |