Security Advisories (1)
CVE-2025-40918 (2025-07-16)

Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely. The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. According to RFC 2831, The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy.

Changes for version 2.1900 - 2025-08-05

  • Fixed
    • CVE-2025-40918 (Insecure source of randomness), required addition of dependency on Crypt::URandom
  • Changed
    • Modules Authen::SASL::Perl::CRAM_MD5, Authen::SASL::Perl::DIGEST_MD5 and Authen::SASL::CRAM_MD5 marked as deprecated based on the respective RFC documents; thanks to @robrwo for the suggestion and @neustradamus for the pointers to the documentation
    • Update module metadata to point to the new 'perl-authen-sasl' org on GitHub to which the modules moved
    • Use VERSION declarations in 'package' statements, since our minimum Perl version is 5.14 anyway

Modules

SASL Authentication framework
Perl implementation of the SASL Authentication framework
Anonymous Authentication class
(DEPRECATED) CRAM MD5 Authentication class
(DEPRECATED) Digest MD5 Authentication class
External Authentication class
GSSAPI (Kerberosv5) Authentication class
Login Authentication class
OAUTHBEARER Authentication class
Plain Login Authentication class
XOAUTH2 Authentication class

Provides

in lib/Authen/SASL/CRAM_MD5.pm
in lib/Authen/SASL/EXTERNAL.pm