Headline
Ubuntu Security Notice USN-6499-2
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.
==========================================================================
Ubuntu Security Notice USN-6499-2
January 08, 2024
gnutls28 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
Summary:
GnuTLS could be made to expose sensitive information over the network.
Software Description:
- gnutls28: GNU TLS library
Details:
USN-6499-1 fixed vulnerabilities in GnuTLS. This update provides the
corresponding update for Ubuntu 18.04 LTS.
Original advisory 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 18.04 LTS (Available with Ubuntu Pro):
libgnutls30 3.5.18-1ubuntu1.6+esm1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6499-2
https://ubuntu.com/security/notices/USN-6499-1
CVE-2023-5981
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.
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.
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.