CVE-2025-2814

Summary

Crypt::CBC versions between 1.21 and 3.05 for Perl may use the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

This issue affects operating systems where "/dev/urandom'" is unavailable.  In that case, Crypt::CBC will fallback to use the insecure rand() function.

Affected Software

Weaknesses

• CWE-338: CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
• CWE-329: CWE-329 Generation of Predictable IV with CBC Mode
• CWE-331: CWE-331 Insufficient Entropy

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://perldoc.perl.org/functions/rand
• https://metacpan.org/dist/Crypt-CBC/source/lib/Crypt/CBC.pm#L777
• https://security.metacpan.org/docs/guides/random-data-for-security.html
• https://github.com/lstein/Lib-Crypt-CBC/commit/37111f7cd894bcec46156ba7f40a49c126ebf535.patch

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