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                            CERT-Renater

                Note d'Information No. 2026/VULN263
_____________________________________________________________________

DATE                : 06/03/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache::Session::Generate::MD5
                              versions prior to 1.94.

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https://lists.security.metacpan.org/cve-announce/msg/37639294/
_____________________________________________________________________

+=======================================================================
CVE-2025-40931                                       CPAN Security Group
========================================================================

         CVE ID:  CVE-2025-40931
   Distribution:  Apache-Session
       Versions:  through 1.94

       MetaCPAN:  https://metacpan.org/dist/Apache-Session
       VCS Repo:  https://github.com/chorny/Apache-Session

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

Description
-----------
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.

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

Solutions
---------
Consider alternate solutions like
https://metacpan.org/pod/Apache::Session::Generate::Random

References
----------
https://metacpan.org/dist/Apache-Session/source/lib/Apache/Session/Generate/MD5.pm#L27
https://security.metacpan.org/docs/guides/random-data-for-security.html

Credits
-------
Robert Rothenberg, finder


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