EHUELS Authen::SASL::Perl::DIGEST_MD5 up to 2.1800 on Perl rand generation of predictable numbers or identifiers

Summaryinfo

A vulnerability marked as problematic has been reported in EHUELS Authen::SASL::Perl::DIGEST_MD5 up to 2.1800 on Perl. This affects the function rand. This manipulation causes generation of predictable numbers or identifiers. This vulnerability is handled as CVE-2025-40918. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in EHUELS Authen::SASL::Perl::DIGEST_MD5 up to 2.1800 on Perl. Affected by this vulnerability is the function rand. The manipulation with an unknown input leads to a generation of predictable numbers or identifiers vulnerability. The CWE definition for the vulnerability is CWE-340. The product uses a scheme that generates numbers or identifiers that are more predictable than required. As an impact it is known to affect confidentiality. The summary by CVE is:

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."

The advisory is shared at metacpan.org. This vulnerability is known as CVE-2025-40918 since 04/16/2025. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1600.001 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 246831 (Linux Distros Unpatched Vulnerability : CVE-2025-40918), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (246831), EUVD (EUVD-2025-21696) and CERT Bund (WID-SEC-2026-1032). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• IBM Tivoli Network Manager

Productinfo

Type

• Programming Language Software

Vendor

• EHUELS

Name

• Authen::SASL::Perl::DIGEST_MD5

Version

• 2

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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