CVE-2021-43527
Published: August 31, 2023Last modified: August 31, 2023
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.
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 |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | nss | Not affected (3.85-r1) |
| Stream | nss | Not affected (3.92-r0) |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1737470
- https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf
- https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/
- https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/
- https://security.gentoo.org/glsa/202212-05
- https://security.netapp.com/advisory/ntap-20211229-0002/
- https://www.mozilla.org/security/advisories/mfsa2021-51/
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.starwindsoftware.com/security/sw-20220802-0001/