#VU57990 Missing Authorization in Jenkins and Jenkins LTS - CVE-2021-21697

Vulnerability identifier: #VU57990

Vulnerability risk: High

CVSSv4.0: 7.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-21697

CWE-ID: CWE-862

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 bypass authorization checks.

The vulnerability exists due to the affected application allows any agent to read and write the contents of any build directory stored in Jenkins with very few restrictions. A remote attacker can compromise the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Jenkins: 2.0 - 2.318

Jenkins LTS: 1.409.1 - 2.303.2

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External links
https://jenkins.io/security/advisory/2021-11-04/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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