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.

suse_linux SUSE-SU-2025:03088-1: SUSE SLES12 : Security update for perl-Authen-SASL, perl-Crypt-URandom (Moderate) (SUSE-SU-2025:03088-1)

suse_linux SUSE-SU-2025:03087-1: SUSE SLED15 / SLES15 / openSUSE 15 : Security update for perl-Authen-SASL, perl-Crypt-URandom (Moderate) (SUSE-SU-2025:03087-1)

The version of perl-Authen-SASL installed on the remote host is prior to 2.15-10. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2025-2967 advisory.

    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 implementationdepends on a good choice. It is RECOMMENDED that it contain at least 64 bits     of entropy. (CVE-2025-40918)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-fddaaaf9f0 advisory.

    2.1900     [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;
    - 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

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the defe9a20-781e-11f0-97c4-40b034429ecf advisory.

    p5-Authen-SASL project reports:
    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.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-40918)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
252297	Amazon Linux 2 : perl-Authen-SASL (ALAS-2025-2967)	Nessus	Amazon Linux Local Security Checks	medium
249330	Fedora 42 : perl-Authen-SASL (2025-fddaaaf9f0)	Nessus	Fedora Local Security Checks	medium
249327	FreeBSD : p5-Authen-SASL -- Insecure source of randomness (defe9a20-781e-11f0-97c4-40b034429ecf)	Nessus	FreeBSD Local Security Checks	medium
246831	Linux Distros Unpatched Vulnerability : CVE-2025-40918	Nessus	Misc.	medium

Detections

Analytics

CVE-2025-40918

medium

Tenable Plugins

Coming Soon

medium

medium

medium

medium