#VU54491 Permissions, Privileges, and Access Controls in Jenkins and Jenkins LTS - CVE-2021-21670

Vulnerability identifier: #VU54491

Vulnerability risk: Low

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

CVE-ID: CVE-2021-21670

CWE-ID: CWE-264

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 escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions. A remote authenticated attacker can cancel queue items and abort builds of jobs for which they have Item/Cancel permission even when they do not have Item/Read permission. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.299

Jenkins LTS: 2.7.1 - 2.289.1

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External links
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2278

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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.