Crypt

Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery. "Crypt::DSA::Util::makerandom forces the high bit of every value it returns to obtain an exactly N-bit integer for prime search. The signing nonce and the private key are drawn from makerandom. Because the high bit is always set, the result is not uniform: its top bit is fixed, producing insecure values." An attacker who collects a modest number of signatures under an affected key, together with the public key, can recover the private key with a lattice attack. Keys used to sign with an affected version should be considered compromised and new keys should be generated.

Published: 2026-07-05T01:30:12.849Z
Updated: 2026-07-06T13:42:11.715Z

Crypt::DSA versions before 1.21 for Perl reused the nonce across signatures, leading to private-key recovery. Crypt::DSA::sign caches the per-signature nonce material in the Key object without ever clearing it. The first sign() on a Key object picks a nonce, and every later sign() on that same object reuses it, producing an identical "r". Keys used to sign more than once with an affected version should be considered compromised.

Published: 2026-06-15T21:57:18.317Z
Updated: 2026-06-16T16:13:32.533Z

Crypt::DSA versions through 1.19 for Perl use 2-args open, allowing existing files to be modified.

Published: 2026-05-15T22:18:15.917Z
Updated: 2026-05-18T15:06:15.379Z

Crypt::DSA versions before 1.20 for Perl generate seeds using rand. Seeds were generated using Perl's built-in rand function, which is predictable and unsuitable for security usage.

Published: 2026-05-15T22:10:52.242Z
Updated: 2026-05-18T15:04:20.918Z