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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.

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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

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

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

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

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

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

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 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.

CVE-2023-5981: cve-details

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.

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