EUVD-2026-29039
GHSA-462c-h7qr-cxm6
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
4DescriptionNVD
WebDyne::Session versions through 2.075 for Perl generates the session id insecurely.
The session handler generates the session id from an MD5 hash seeded with a call to the built-in rand() function. The rand function is passed a maximum value based on the process id, the epoch time and the reference address of the object, but this information will have no effect on the overall quality of the seed of the message digest.
The rand function is seeded by 32-bits and is predictable. It is considered unsuitable for cryptographic purposes.
Predictable session ids could allow an attacker to gain access to systems.
Note that WebDyne::Session versions 1.042 and earlier appear to be in separate distributions from WebDyne.
AnalysisAI
WebDyne::Session versions through 2.075 for Perl generate cryptographically weak session identifiers using MD5 hashing seeded with Perl's predictable rand() function, allowing attackers to forge valid session IDs and gain unauthorized access to systems. The vulnerability affects all versions from 0 through 2.075 and stems from reliance on a 32-bit-seeded random number generator unsuitable for cryptographic purposes, making session hijacking feasible without authentication.
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