Ubuntu Security Notice 3999-1 - Eyal Ronen, Kenneth G. Paterson, and Adi Shamir discovered that GnuTLS was vulnerable to a timing side-channel attack known as the "Lucky Thirteen" issue. A remote attacker could possibly use this issue to perform plaintext-recovery attacks via analysis of timing data. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Tavis Ormandy discovered that GnuTLS incorrectly handled memory when verifying certain X.509 certificates. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS, Ubuntu 18.10, and Ubuntu 19.04. Various other issues were also addressed.
b8834a0c4a4415f7835754310e5da31860dabee4b26c193e7e1297853870b1e3Red Hat Security Advisory 2018-3505-01 - Red Hat Ansible Tower 3.3.1 is now available and contains a large amount of security fixes.
5a18fce8ca273b8a62b85b1a2bf4e5b4df4fb5583a3543625bcc53528045ab49Red Hat Security Advisory 2018-3050-01 - The gnutls packages provide the GNU Transport Layer Security library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS. Issues addressed include Lucky Thirteen and other attack mitigations.
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