Headline
Ubuntu Security Notice USN-6499-1
Ubuntu Security Notice 6499-1 - 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.
==========================================================================
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
Related news
Red Hat Security Advisory 2024-1082-03 - An update for gnutls is now available for Red Hat Enterprise Linux 9.2 Extended Update Support.
Red Hat Security Advisory 2024-0796-03 - An update for gnutls is now available for Red Hat Enterprise Linux 8.8 Extended Update Support.
Red Hat Security Advisory 2024-0627-03 - An update for gnutls is now available for Red Hat Enterprise Linux 8.
Red Hat Security Advisory 2024-0533-03 - An update for gnutls is now available for Red Hat Enterprise Linux 9.
Red Hat Security Advisory 2024-0399-03 - An update for gnutls is now available for Red Hat Enterprise Linux 8.8 Extended Update Support.
Red Hat Security Advisory 2024-0319-03 - An update for gnutls is now available for Red Hat Enterprise Linux 8.6 Extended Update Support.
Ubuntu Security Notice 6499-2 - USN-6499-1 fixed vulnerabilities in GnuTLS. This update provides the corresponding update for Ubuntu 18.04 LTS. 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.
A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.