Logjam common primes

OWASP 2013-A9 OWASP 2017-A9 OWASP 2021-A6 PCI v3.2-6.5.4 OWASP PC-C1 CAPEC-217 CWE-757 ISO27001-A.14.1.2 WSTG-CRYP-01

The logjam is a security vulnerability against a Diffie–Hellman key exchange. It ranges from 512-bit to 1024-bit keys. It was publicly reported on May 20, 2015, by a group of scientists. This server support is vulnerable to DHE_EXPORT and thus this server is vulnerable to Logjam attack. This type of attack allows a man in the middle attacker to downgrade vulnerable TLS connections to 512-bit export grade cryptography. This allows the attacker to read and modify any data passed over the connection.


Using this vulnerability, an attacker can:-

  • perform Man-in-the-middle (MITM)attack
  • read and modify data passed over the connection

Mitigation / Precaution

Beagle recommends the following fixes:-

  • disable support for export cipher suites
  • use a 2048-bit Diffie-Hellman group

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