Security advisory for Logjam vulnerability

The Logjam vulnerability, which allows attackers to perform a man-in-the-middle attack by downgrading a TLS connection to 512-bit DH parameters, has implications for GitLab security. GitLab installations are generally safe due to the use of up-to-date SSL ciphers and 1024-bit DH groups by default, but there remains a potential risk from nation-state attackers. To mitigate this, GitLab users can upgrade to 2048-bit DH groups by generating and configuring new parameters in the NGINX settings. The process varies slightly depending on whether GitLab is installed via omnibus-gitlab packages or from source. For GitLab.com, the service currently uses 1028-bit DH groups and has not transitioned to 2048-bit groups due to compatibility issues with older Java-based clients, but the team is exploring solutions to maintain security without disrupting service accessibility.

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