The Crypt::DSA (aka Crypt-DSA) module 1.17 and earlier for Perl, when /dev/random is absent, uses the Data::Random module, which makes it easier for remote attackers to spoof a signature, or determine the signing key of a signed message, via a brute-force attack.
https://rt.cpan.org/Public/Bug/Display.html?id=71421
https://bugzilla.redhat.com/show_bug.cgi?id=743567
http://www.securityfocus.com/bid/49928
http://www.openwall.com/lists/oss-security/2011/10/05/9
http://www.openwall.com/lists/oss-security/2011/10/05/5