OpenSSL: Denial of service

Background

OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general purpose cryptography library.

Description

It was discovered that OpenSSL allow malicious servers to send very large primes to a client during DH(E) based TLS handshakes.

Impact

A remote attacker, by sending large prime to client during DH(E) TLS handshake, could possibly cause a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All OpenSSL users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.2o-r6"