[USN-5550-1] GnuTLS vulnerabilities


========================================================================== Ubuntu Security Notice USN-5550-1 August 04, 2022
gnutls28 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 22.04 LTS – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in GnuTLS.
Software Description: – gnutls28: GNU TLS library
Details:
It was discovered that GnuTLS incorrectly handled certain memory operations. A remote attacker could possibly use this issue to cause GnuTLS to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-4209)
It was discovered that GnuTLS incorrectly handled the verification of certain pkcs7 signatures. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2022-2509)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 22.04 LTS: libgnutls30 3.7.3-4ubuntu1.1
Ubuntu 20.04 LTS: libgnutls30 3.6.13-2ubuntu1.7
Ubuntu 18.04 LTS: libgnutls30 3.5.18-1ubuntu1.6
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5550-1 CVE-2021-4209, CVE-2022-2509
Package Information: launchpad.net/ubuntu/+source/gnutls28/3.7.3-4ubuntu1.1 launchpad.net/ubuntu/+source/gnutls28/3.6.13-2ubuntu1.7 launchpad.net/ubuntu/+source/gnutls28/3.5.18-1ubuntu1.6