USN-6593-1: GnuTLS vulnerabilities

Releases

• Ubuntu 23.10
• Ubuntu 23.04
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Packages

• 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

• libgnutls30 - 3.7.3-4ubuntu1.4

Ubuntu 20.04

• libgnutls30 - 3.6.13-2ubuntu1.10

In general, a standard system update will make all the necessary changes.

References

• CVE-2024-0553
• CVE-2024-0567