==========================================================================
Ubuntu Security Notice USN-6593-1
January 22, 2024
gnutls28 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 23.10
- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in GnuTLS.
Software Description:
- gnutls28: GNU TLS library
Details:
It was discovered that GnuTLS had a timing side-channel when processing
malformed ciphertexts in RSA-PSK ClientKeyExchange. A remote attacker could
possibly use this issue to recover sensitive information. (CVE-2024-0553)
It was discovered that GnuTLS incorrectly handled certain certificate
chains with a cross-signing loop. A remote attacker could possibly use this
issue to cause GnuTLS to crash, resulting in a denial of service. This
issue only affected Ubuntu 22.04 LTS, Ubuntu 23.04, and Ubuntu 23.10.
(CVE-2024-0567)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 23.10:
   libgnutls30                     3.8.1-4ubuntu1.2
Ubuntu 23.04:
   libgnutls30                     3.7.8-5ubuntu1.2
Ubuntu 22.04 LTS:
   libgnutls30                     3.7.3-4ubuntu1.4
Ubuntu 20.04 LTS:
   libgnutls30                     3.6.13-2ubuntu1.10
In general, a standard system update will make all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6593-1
   CVE-2024-0553, CVE-2024-0567
Package Information:
   https://launchpad.net/ubuntu/+source/gnutls28/3.8.1-4ubuntu1.2
   https://launchpad.net/ubuntu/+source/gnutls28/3.7.8-5ubuntu1.2
   https://launchpad.net/ubuntu/+source/gnutls28/3.7.3-4ubuntu1.4
   https://launchpad.net/ubuntu/+source/gnutls28/3.6.13-2ubuntu1.10