CVE-2020-2231 Improper Neutralization of Input During Web Page Generation in Jenkins
Stored XSS in Jenkins allows attackers with specific permissions or token knowledge to execute scripts in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-2231?
CVE-2020-2231 is a medium-severity cross-site scripting vulnerability in Jenkins Jenkins, published on 12 Aug 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Jenkins 2.251 and earlier, LTS 2.235.3 and earlier does not escape the remote address of the host starting a build via 'Trigger builds remotely', resulting in a stored cross-site scripting (XSS) vulnerability exploitable by users with Job/Configure permission or knowledge of the Authentication Token.
Weakness: CWE-79
Which versions are affected by CVE-2020-2231?
5 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.main:jenkins-core Maven | All versions | 2.235.4 |
org.jenkins-ci.main:jenkins-core Maven | All versions | 2.235.4 |
org.jenkins-ci.main:jenkins-core Maven | From 2.237 | 2.252 |
org.jenkins-ci.main:jenkins-core Maven | From 2.237 | 2.252 |
jenkins Bitnami | All versions | 2.251.1 |
Products include Jenkins Jenkins.
How do I fix CVE-2020-2231?
Upgrade org.jenkins-ci.main:jenkins-core to a fixed version for your release line: 2.235.4 or 2.252.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2020-2231 being exploited?
There is no known exploitation of CVE-2020-2231 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry.
Other vulnerabilities in Jenkins Jenkins
- CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal
- CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data
- CVE-2017-1000353 Jenkins Remote Code Execution
- CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure
- CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
Sources
Also known as BIT-jenkins-2020-2231, GHSA-jpvq-v729-7j2h.