Exploit/Advisories

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Ubuntu Security Notice USN-6733-1
April 15, 2024

gnutls28 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in GnuTLS.

Software Description:
- gnutls28: GNU TLS library

Details:

It was discovered that GnuTLS had a timing side-channel when performing
certain ECDSA operations. A remote attacker could possibly use this issue
to recover sensitive information. (CVE-2024-28834)

It was discovered that GnuTLS incorrectly handled verifying certain PEM
bundles. 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 and Ubuntu 23.10. (CVE-2024-28835)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.10:
libgnutls30 3.8.1-4ubuntu1.3

Ubuntu 22.04 LTS:
libgnutls30 3.7.3-4ubuntu1.5

Ubuntu 20.04 LTS:
libgnutls30 3.6.13-2ubuntu1.11

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

References:
https://ubuntu.com/security/notices/USN-6733-1
CVE-2024-28834, CVE-2024-28835

Package Information:
https://launchpad.net/ubuntu/+source/gnutls28/3.8.1-4ubuntu1.3
https://launchpad.net/ubuntu/+source/gnutls28/3.7.3-4ubuntu1.5
https://launchpad.net/ubuntu/+source/gnutls28/3.6.13-2ubuntu1.11