Insufficient Session Expiration Affecting kanboard package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-KANBOARD-8537307
- published20 Dec 2024
- disclosed19 Dec 2024
Introduced: 19 Dec 2024
NewCVE-2024-55603 (opens in a new tab)How to fix?
There is no fixed version for Debian:unstable kanboard.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kanboard package and not the kanboard package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2024-55603
- https://github.com/kanboard/kanboard/blob/main/app/Core/Session/SessionHandler.php#L40
- https://github.com/kanboard/kanboard/commit/7ce61c34d962ca8b5dce776289ddf4b207be6e78
- https://github.com/kanboard/kanboard/security/advisories/GHSA-gv5c-8pxr-p484
- https://www.php.net/manual/en/function.session-start.php
- https://www.php.net/manual/en/session.configuration.php#ini.session.gc-divisor
- https://www.php.net/manual/en/session.configuration.php#ini.session.gc-maxlifetime
- https://www.php.net/manual/en/session.configuration.php#ini.session.gc-probability
- https://www.php.net/manual/en/sessionhandlerinterface.gc.php