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[USN-7635-1] GnuTLS vulnerabilities

Posted on 14 July 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7635-1
July 14, 2025

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

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in GnuTLS.

Software Description:
- gnutls28: GNU TLS library

Details:

It was discovered that GnuTLS incorrectly handled exporting Subject
Alternative Name (SAN) entries containing an otherName. A remote attacker
could use this issue to cause GnuTLS to crash, resulting in a denial of
service, or possibly execute arbitrary code. (CVE-2025-32988)

It was discovered that GnuTLS incorrectly handled parsing the Certificate
Transparency (CT) Signed Certificate Timestamp (SCT) extension. A remote
attacker could use this issue to cause GnuTLS to crash, resulting in a
denial of service, or possibly obtain sensitive information.
(CVE-2025-32989)

It was discovered that the GnuTLS certtool utility incorrectly handled
parsing certain template files. An attacker could use this issue to cause
GnuTLS to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2025-32990)

Stefan Bühler discovered that GnuTLS incorrectly handled parsing certain
template files. An attacker could possibly use this issue to cause GnuTLS
to crash, resulting in a denial of service. (CVE-2025-6395)

Update instructions:

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

Ubuntu 25.04
libgnutls30t64 3.8.9-2ubuntu3.1

Ubuntu 24.04 LTS
libgnutls30t64 3.8.3-1.1ubuntu3.4

Ubuntu 22.04 LTS
libgnutls30 3.7.3-4ubuntu1.7

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

References:
https://ubuntu.com/security/notices/USN-7635-1
CVE-2025-32988, CVE-2025-32989, CVE-2025-32990, CVE-2025-6395

Package Information:
https://launchpad.net/ubuntu/+source/gnutls28/3.8.9-2ubuntu3.1
https://launchpad.net/ubuntu/+source/gnutls28/3.8.3-1.1ubuntu3.4
https://launchpad.net/ubuntu/+source/gnutls28/3.7.3-4ubuntu1.7

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