Debian Security Advisory DSA 996-1 – Lincoln Stein discovered that the Perl Crypt::CBC module produces weak ciphertext when used with block encryption algorithms with a blocksize less than 8 bytes.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/44610/dsa-996-1.txt
Source: https://packetstormsecurity.com/files/44610/Debian-Linux-Security-Advisory-996-1.html