A gnutls28 security update has been released for Debian GNU/Linux 10 LTS to address a vulnerability that may facilitate a timing attack to compromise a cryptographic system.

[SECURITY] [DLA 3660-1] gnutls28 security update

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Debian LTS Advisory DLA-3660-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Markus Koschany
November 22, 2023 https://wiki.debian.org/LTS
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Package : gnutls28
Version : 3.6.7-4+deb10u11
CVE ID : CVE-2023-5981
Debian Bug : 1056188

A vulnerability was found in GnuTLS, a secure communications library, which
may facilitate a timing attack to compromise a cryptographic system. The
response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ
from response times of ciphertexts with correct PKCS#1 v1.5 padding. Only
TLS ciphertext processing is affected.

For Debian 10 buster, this problem has been fixed in version
3.6.7-4+deb10u11.

We recommend that you upgrade your gnutls28 packages.

For the detailed security status of gnutls28 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/gnutls28

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