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LOGJAM SSL Vulnerability

The Logjam vulnerability is a security flaw in the TLS protocol that allows attackers to weaken the encryption of HTTPS connections by forcing them to use weak, export-grade cryptography. It specifically targets the Diffie-Hellman key exchange process, exploiting its use of common prime numbers. This vulnerability makes it feasible for attackers to intercept and decrypt communications, posing a significant threat to data confidentiality.

 

How to fix the Logjam vulnerability ? 

  1. Disable Export-Grade Cipher Suites: Update your server configuration to disable all export-grade cipher suites, particularly those using DHE_EXPORT, which are vulnerable to the Logjam attack.

  2. Use Strong Diffie-Hellman Groups: Replace the Diffie-Hellman parameters with a strong, unique prime of at least 2048 bits. Avoid using common or weak DH parameters.

  3. Enforce TLS 1.2 or Higher: Configure your servers to use TLS 1.2 or higher, as these versions offer more robust security features and are not susceptible to the same downgrade attacks

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