Vulnerability identifier: #VU57147

Vulnerability risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

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

---

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

---

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.