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Debian LTS Advisory DLA-3634-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                         Sean Whitton
October 28, 2023                              https://wiki.debian.org/LTS
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Package        : nss
Version        : 2:3.42.1-1+deb10u7
CVE ID         : CVE-2020-25648 CVE-2023-4421

Multiple vulnerabilities were found in nss, a set of libraries designed
to support cross-platform development of security-enabled client and
server applications.

CVE-2020-25648

    A flaw was discovered in how NSS handles CipherChangeSpec messages
    in TLS 1.3.  It could allow an attacker to send multiple CCS
    messages to servers compiled against NSS, causing denial-of-service.

CVE-2023-4421

    A fuzzing project discovered vulnerabilities to Bleichenbacher
    timing attacks in NSS's facilities for RSA cryptography.

For Debian 10 buster, these problems have been fixed in version
2:3.42.1-1+deb10u7.

We recommend that you upgrade your nss packages.

For the detailed security status of nss please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/nss

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS