Scientific Linux Security Update : nss on SL6.x, SL7.x i386/x86_64 (Logjam)
Medium Nessus Plugin ID 84539
SynopsisThe remote Scientific Linux host is missing one or more security updates.
DescriptionA flaw was found in the way the TLS protocol composes the Diffie-Hellman (DH) key exchange. A man-in-the-middle attacker could use this flaw to force the use of weak 512 bit export-grade keys during the key exchange, allowing them do decrypt all traffic.
Note: This update forces the TLS/SSL client implementation in NSS to reject DH key sizes below 768 bits, which prevents sessions to be downgraded to export-grade keys. Future updates may raise this limit to 1024 bits.
The nss and nss-util packages have been upgraded to upstream versions 3.19.1. The upgraded versions provide a number of bug fixes and enhancements over the previous versions.
SolutionUpdate the affected packages.