CVE-2021-43527 Information

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

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://www.mozilla.org/security/advisories/mfsa2021-51/ https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/ https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/ https://bugzilla.mozilla.org/show_bug.cgi?id=1737470 https://security.netapp.com/advisory/ntap-20211229-0002/ https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf https://www.oracle.com/security-alerts/cpuapr2022.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8