This issue does not affect usage of the Jenkins CLI. In order to exploit this issue, an attacker would have to be able to configure a vulnerable version of Jenkins and have the ability to specify an input step with an ID. An attacker could specify an input step ID in an arbitrary input step, allowing them to generate arbitrary URLs that could be used to bypass the CSRF protection of any target URL in Jenkins. In order to exploit this issue, an attacker would have to be able to configure a vulnerable version of Jenkins and have the ability to specify an input step with an ID. An attacker could specify an input step ID in an arbitrary input step, allowing them to generate arbitrary URLs that could be used to bypass the CSRF protection of any target URL in Jenkins. Jenkins Pipeline: Stage View Plugin 2.26 and earlier does not encode the ID of 'output' steps when using it to generate URLs to proceed or abort Pipeline builds, allowing attackers able to configure Pipelines to specify 'output' step IDs resulting in URLs that would bypass the CSRF protection of any target URL in Jenkins.
CVE ID: CVE-2018-12520 CWE: CWE-119 - Improperly Sanitized Input - CVSS: 8.5 Click here for an updated version of the Security Advisory.
Insecure Creation of Configuration File
The Jenkins Pipeline: Stage View Plugin 2.26 and earlier does not encode the ID of 'output' steps when using it to generate URLs to proceed or abort Pipeline builds, allowing attackers able to configure Pipelines to specify 'output' step IDs resulting in URLs that would bypass the CSRF protection of any target URL in Jenkins.
Insecure Creation of Configuration File - CVE ID: CVE-2018-12520 CWE: CWE-119 - Improperly Sanitized Input - CVSS: 8.5
Click here for an updated version of the Security Advisory
References https://www.securitytracker.com/id/1038815
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How Does Jenkins Protect Users From CSRF?
Jenkins protects users from CSRF attacks by using the built-in HTTP “CSRF token” to ensure that a request is being made by the user who's logged in. The token is generated when a user logs in, and is then encrypted when used. When creating requests, Jenkins checks that the "csrfToken" field of submitted data contains the encrypted value of the CSRF token. If not, it rejects the request (see https://jenkins.io/security/csrf).
The vulnerability allows an attacker to manipulate input steps configured by any target URL located in Jenkins.
Timeline
Published on: 10/19/2022 16:15:00 UTC
Last modified on: 10/21/2022 18:52:00 UTC