==========================================================================
Ubuntu Security Notice USN-6499-1
November 21, 2023
gnutls28 vulnerability
==========================================================================
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:
GnuTLS could be made to expose sensitive information over the network.
Software Description:
- gnutls28: GNU TLS library
Details:
It was discovered that GnuTLS had a timing side-channel when handling
certain RSA-PSK key exchanges. A remote attacker could possibly use this
issue to recover sensitive information.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 23.10:
   libgnutls30                     3.8.1-4ubuntu1.1
Ubuntu 23.04:
   libgnutls30                     3.7.8-5ubuntu1.1
Ubuntu 22.04 LTS:
   libgnutls30                     3.7.3-4ubuntu1.3
Ubuntu 20.04 LTS:
   libgnutls30                     3.6.13-2ubuntu1.9
In general, a standard system update will make all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6499-1
   CVE-2023-5981
Package Information:
   https://launchpad.net/ubuntu/+source/gnutls28/3.8.1-4ubuntu1.1
   https://launchpad.net/ubuntu/+source/gnutls28/3.7.8-5ubuntu1.1
   https://launchpad.net/ubuntu/+source/gnutls28/3.7.3-4ubuntu1.3
   https://launchpad.net/ubuntu/+source/gnutls28/3.6.13-2ubuntu1.9