CVE-2025-40931

Summary

Apache::Session::Generate::MD5 versions through 1.94 for Perl create insecure session id.

Apache::Session::Generate::MD5 generates session ids insecurely. The default session id generator returns a MD5 hash seeded with the built-in rand() function, the epoch time, and the PID. 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. Predicable session ids could allow an attacker to gain access to systems.

Note that the libapache-session-perl package in some Debian-based Linux distributions may be patched to use Crypt::URandom.

Affected Software

VendorProductVersion RangeStatus
CHORNYApache::Session::Generate::MD50 <= 1.94affected

Weaknesses

  • CWE-340: CWE-340 Generation of Predictable Numbers or Identifiers
  • CWE-338: CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator

Workarounds

Apply the patch from the Debian Perl Group that uses Crypt::URandom.

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: total

References