SALVA Authen::DigestMD5 up to 0.04 on Perl rand generation of predictable numbers or identifiers

Summaryinfo

A vulnerability identified as problematic has been detected in SALVA Authen::DigestMD5 up to 0.04 on Perl. The affected element is the function rand. The manipulation leads to generation of predictable numbers or identifiers. This vulnerability is traded as CVE-2025-40919. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in SALVA Authen::DigestMD5 up to 0.04 on Perl. It has been rated as problematic. This issue affects the function rand. The manipulation with an unknown input leads to a generation of predictable numbers or identifiers vulnerability. Using CWE to declare the problem leads to CWE-340. The product uses a scheme that generates numbers or identifiers that are more predictable than required. Impacted is confidentiality. The summary by CVE is:

Authen::DigestMD5 versions 0.01 through 0.02 for Perl generate 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."

It is possible to read the advisory at metacpan.org. The identification of this vulnerability is CVE-2025-40919 since 04/16/2025. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1600.001 according to MITRE ATT&CK.

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 vulnerability database at EUVD (EUVD-2025-21702). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• SALVA

Name

• Authen::DigestMD5

Version

• 0.04

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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