cve/2020/CVE-2020-13895.md

CVE-2020-13895

Description

Crypt::Perl::ECDSA in the Crypt::Perl (aka p5-Crypt-Perl) module before 0.32 for Perl fails to verify correct ECDSA signatures when r and s are small and when s = 1. This happens when using the curve secp256r1 (prime256v1). This could conceivably have a security-relevant impact if an attacker wishes to use public r and s values when guessing whether signature verification will fail.

POC

Reference

• https://github.com/FGasper/p5-Crypt-Perl/issues/14

Github

• https://github.com/FGasper/p5-Crypt-Perl