CVE-2024-55603: Kanboard is project management software that focuses on the Kanban methodology. In affected versions sessions are still usable even though their lifetime has…

PriorityP336medium6.5CVSS 3.1

AVNACLPRNUINSUCLILAN

EPSS

0.50%

39.6th percentile

Kanboard is project management software that focuses on the Kanban methodology. In affected versions sessions are still usable even though their lifetime has exceeded. Kanboard implements a cutom session handler (`app/Core/Session/SessionHandler.php`), to store the session data in a database. Therefore, when a `session_id` is given, kanboard queries the data from the `sessions` sql table. At this point, it does not correctly verify, if a given `session_id` has already exceeded its lifetime (`expires_at`). Thus, a session which's lifetime is already `> time()`, is still queried from the database and hence a valid login. The implemented **SessionHandlerInterface::gc** function, that does remove invalid sessions, is called only **with a certain probability** (_Cleans up expired sessions. Called by `session_start()`, based on `session.gc_divisor`, `session.gc_probability` and `session.gc_maxlifetime` settings_) accordingly to the php documentation. In the official Kanboard docker image these values default to: session.gc_probability=1, session.gc_divisor=1000. Thus, an expired session is only terminated with probability 1/1000. This issue has been addressed in release 1.2.43 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
debian	kanboard	< kanboard 1.2.44+ds-1 (forky)	kanboard 1.2.44+ds-1 (forky)
kanboard	kanboard	< 1.2.43	1.2.43
kanboard	kanboard	>= 0 < 1.2.44+ds-1	1.2.44+ds-1

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

osv6.5MEDIUM

vendor_debian6.5MEDIUM

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