#VU57149 Stored cross-site scripting in Git plugin - CVE-2021-21684

Vulnerability identifier: #VU57149

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-21684

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Git plugin
Web applications / Modules and components for CMS

Vendor: Jenkins

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Git plugin: 0.1 - 4.8.2

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External links
https://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2499
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 non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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