CVE-2002-20002 in Net::EasyTCP Package
Summary
by MITRE • 01/02/2025
The Net::EasyTCP package before 0.15 for Perl always uses Perl's builtin rand(), which is not a strong random number generator, for cryptographic keys.
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Analysis
by VulDB Data Team • 01/02/2025
The vulnerability described in CVE-2002-20002 affects the Net::EasyTCP Perl package version 0.14 and earlier, presenting a significant cryptographic weakness that undermines the security of network communications. This flaw resides in the package's implementation of random number generation for cryptographic key creation, where it relies on Perl's built-in rand() function instead of a cryptographically secure random number generator. The use of weak random number generation in cryptographic contexts creates a fundamental security risk that can be exploited by attackers to predict or compromise cryptographic keys.
The technical flaw stems from the inherent weaknesses of Perl's rand() function, which is designed for general-purpose randomization rather than cryptographic security. This function typically uses a linear congruential generator algorithm that produces pseudo-random numbers with predictable patterns, making it unsuitable for generating cryptographic keys that require high entropy and unpredictability. The vulnerability directly maps to CWE-330, which specifically addresses the use of insufficiently random values in cryptographic contexts, and aligns with the broader category of weak random number generation issues that have plagued cryptographic implementations across various platforms and languages.
The operational impact of this vulnerability extends beyond simple network security concerns to potentially compromise the integrity of encrypted communications and authentication mechanisms that depend on the Net::EasyTCP package. Attackers who can predict or reproduce the sequence of random numbers generated by the vulnerable package may be able to decrypt communications, forge authentication tokens, or break encryption schemes that rely on these weakly generated keys. This vulnerability particularly affects systems that use the package for secure network communications, including web applications, network services, and any Perl-based systems that require cryptographic key generation for security purposes.
The mitigation strategy for this vulnerability requires immediate upgrading to Net::EasyTCP version 0.15 or later, which addresses the random number generation issue by implementing proper cryptographic random number generation functions. Organizations should also conduct thorough security assessments to identify all systems using vulnerable versions of the package and ensure that any cryptographic keys generated by the system are regenerated with strong random number generators. From an ATT&CK framework perspective, this vulnerability relates to T1583.001, which covers the development of tools and techniques for exploitation, as attackers could leverage this weakness to develop more sophisticated attacks against vulnerable systems. Additionally, the vulnerability demonstrates the importance of adhering to cryptographic best practices and the principle of using only cryptographically secure random number generators for security-sensitive operations.