GitLab.com and Logjam

GitLab addressed the Logjam vulnerability by updating its SSL cipher suites, opting for stronger security measures while balancing compatibility with older Java-based clients. Initially using 1024-bit DH groups for broader client support, GitLab decided to implement 2048-bit DHE params for enhanced security, although this risked excluding users with outdated Java clients. After evaluating the drawbacks of DHE, such as reduced speed and limited browser support, GitLab removed DHE suites from its configurations, aligning with practices seen on Google sites. This change resulted in improved SSL labs scores from B to A and maintained forward secrecy for most major browsers through ECDHE, although it compromised forward secrecy for a small number of older systems like Android 2.3.7, Java 6, and OpenSSL 0.9.8. The updates also included revised configurations for both omnibus-gitlab packages and source installations, ensuring that the majority of users benefit from the heightened security.

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