Executive Summary

Crypt::PasswdMD5 versions through 1.42 for Perl generate insecure random values for salts.

The vulnerability arises because the built-in rand function used to generate these salts is predictable and unsuitable for cryptographic purposes.

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Impact Analysis

Because the salts used in password hashing are generated using a predictable random function, attackers may be able to guess or reproduce these salts.

This predictability weakens the security of hashed passwords, potentially making it easier for attackers to perform attacks such as precomputed hash attacks or rainbow table attacks.

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Compliance Impact

The vulnerability in Crypt::PasswdMD5 versions through 1.42 involves the generation of insecure random values for salts due to the use of a predictable built-in rand function, which is unsuitable for cryptography.

This weakness can lead to compromised password hashing security, potentially increasing the risk of unauthorized access to sensitive data.

Such a security flaw may impact compliance with standards and regulations like GDPR and HIPAA, which require adequate protection of personal and sensitive information through strong cryptographic measures.

Failure to use secure cryptographic practices could result in non-compliance due to insufficient protection of data confidentiality.

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Detection Guidance

This vulnerability affects Crypt::PasswdMD5 versions up to and including 1.42 for Perl, specifically due to the use of the built-in rand function for salt generation, which is predictable and insecure.

To detect if your system is vulnerable, you should check if the Crypt::PasswdMD5 Perl module is installed and verify its version.

• Run the command `perl -MCrypt::PasswdMD5 -e 'print $Crypt::PasswdMD5::VERSION'` to determine the installed version.
• Search your codebase or scripts for usage of Crypt::PasswdMD5, especially calls to functions that generate salts.
• Review the source code of Crypt::PasswdMD5 (lines 35-47 in lib/Crypt/PasswdMD5.pm) if possible, to confirm the use of the built-in rand function for salt generation.

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Mitigation Strategies

Immediate mitigation steps include upgrading or replacing the vulnerable Crypt::PasswdMD5 module to a version that does not use the insecure built-in rand function for salt generation.

If an updated version is not available, consider patching the module to use a cryptographically secure random number generator instead of the built-in rand function.

Additionally, review and update any password hashes generated with the vulnerable module to ensure salts are generated securely.

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