QID 730236

Date Published: 2021-10-18

QID 730236: Jenkins Core Multiple Security Vulnerabilities (Jenkins Security Advisory 2021-10-06)

Jenkins is an open-source automation server written in Java. Jenkins helps to automate the non-human part of the software development process, with continuous integration and facilitating technical aspects of continuous delivery.

CVE-2021-21682: On Windows, when specifying a file or folder with a trailing dot character (example.), the file or folder will be treated as if that character was not present (example). As both are legal names for jobs and other entities in Jenkins 2.314 and earlier, LTS 2.303.1 and earlier, this could allow users with the appropriate permissions to change or replace configurations of jobs and other entities.
CVE-2021-21683: The file browser for workspaces, archived artifacts, and userContent/ in Jenkins 2.314 and earlier, LTS 2.303.1 and earlier may interpret some paths to files as absolute on Windows.

Affected Versions:
Jenkins weekly up to and including 2.314
Jenkins LTS up to and including 2.303.1

Fixed Versions:
Jenkins weekly should be updated to version 2.315
Jenkins LTS should be updated to version 2.303.2

NOTE:
These CVEs only affected to Windows Operating System.

QID Detection Logic(Unauthenticated):
This QID checks for vulnerable version by sending a crafted GET request to Jenkins. This QID also detects the vulnerable version from login page or HTTP header.

Successful exploitation of these vulnerability may allow an attacker to obtain contents of arbitrary files on the target system.

CVSS V3 rated as High - 6.5 severity.

CVSS V2 rated as Medium - 4 severity.

Solution

Customers are advised to upgrade to latest Jenkins version
For further details refer to Jenkins Security Advisory 2021-10-06

Vendor References

Jenkins Security Advisory 2021-10-06 - www.jenkins.io/security/advisory/2021-10-06/

CVEs related to QID 730236

CVE-2021-21682 | CVE-2021-21683 |

Software Advisories

Advisory ID	Software	Component	Link
Jenkins Security Advisory 2021-10-06			www.jenkins.io/security/advisory/2021-10-06/

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