Description
Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id function in Concierge::Sessions::Base defaults to using the uuidgen command to generate a UUID, with a fallback to using Perl's built-in rand function. Neither of these methods are secure, and attackers are able to guess session_ids that can grant them access to systems. Specifically, * There is no warning when uuidgen fails. The software can be quietly using the fallback rand() function with no warnings if the command fails for any reason. * The uuidgen command will generate a time-based UUID if the system does not have a high-quality random number source, because the call does not explicitly specify the --random option. Note that the system time is shared in HTTP responses. * UUIDs are identifiers whose mere possession grants access, as per RFC 9562. * The output of the built-in rand() function is predictable and unsuitable for security applications.
Problem types
CWE-340 Generation of Predictable Numbers or Identifiers
CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Product status
0.8.1 (custom) before 0.8.5
Credits
Robert Rothenberg
References
metacpan.org/...ns-v0.8.4/diff/BVA/Concierge-Sessions-v0.8.5
security.metacpan.org/...uides/random-data-for-security.html
www.rfc-editor.org/rfc/rfc9562.html
perldoc.perl.org/5.42.0/functions/rand
github.com/...ommit/20bb28e92e8fba307c4ff8264701c215be65e73b