Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis Manuel Alvarez Tapia discovered that the OpenSSL RSA Key generation algorithm has been shown to be vulnerable to a cache timing side channel attack. An attacker with sufficient access to mount cache timing attacks during the RSA key generation process could recover the private key.
For Debian 7 Wheezy, these problems have been fixed in version 1.0.1t-1+deb7u6.
We recommend that you upgrade your openssl packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/