Jenkins Gogs Plugin provides a webhook endpoint at /gogs-webhook that can be used to trigger builds of jobs. In Gogs Plugin 1.0.15 and earlier, an option to specify a Gogs secret for this webhook is provided, but not enabled by default.

This allows unauthenticated attackers to trigger builds of jobs corresponding to the attacker-specified job name.

Additionally, the output of the webhook endpoint includes whether a job corresponding to the attacker-specified job name exists, even if the attacker has no permission to access it.

As of publication of this advisory, there is no fix.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-40348
• https://www.jenkins.io/security/advisory/2023-08-16/#SECURITY-2894
• http://www.openwall.com/lists/oss-security/2023/08/16/3