Detecting GnuTLS CVE-2020-13777 using Zeek

By Johanna Amann, Software Engineer, Corelight CVE-2020-13777 is a high severity issue in GnuTLS. In a nutshell, GnuTLS versions between 3.6.4 (released 2018-09-24) and 3.6.14 (2020-06-03) have a serious bug in their session resumption code, which lets attackers either completely decrypt observed traffic (for TLS versions up to 1.2), or perform a man-in-the-middle (MITM) attack … Continue reading Detecting GnuTLS CVE-2020-13777 using Zeek