#VU57147 Path Equivalence in Jenkins and Jenkins LTS - CVE-2021-21682

Vulnerability identifier: #VU57147

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-21682

CWE-ID: CWE-42

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Jenkins
Server applications / Application servers
Jenkins LTS
Server applications / Application servers

Vendor: Jenkins

Description

The vulnerability allows a remote attacker to compromise the target system. 

The vulnerability exists due to improper handling of equivalent directory names on Windows. A remote authenticated attacker can change or replace configurations of jobs and other entities. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.314

Jenkins LTS: 2.7.1 - 2.303.1

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External links
https://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2424
https://www.openwall.com/lists/oss-security/2021/10/06/1

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.