CVE-2021-21673 Open redirect vulnerability in Jenkins CAS Plugin
Attackers can exploit improper redirect validation in the Jenkins CAS Plugin to perform phishing attacks by redirecting users to malicious sites.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-21673?
CVE-2021-21673 is a medium-severity vulnerability in Jenkins CAS Plugin, published on 30 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.
Which versions are affected by CVE-2021-21673?
2 open source packages ship an affected version, including org.jenkins-ci.plugins:cas-plugin. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.plugins:cas-plugin Maven | All versions | 1.6.1 |
org.jenkins-ci.plugins:cas-plugin Maven | All versions | 1.6.1 |
Products include Jenkins Cas.
How do I fix CVE-2021-21673?
Upgrade org.jenkins-ci.plugins:cas-plugin to 1.6.1 or later.
Is CVE-2021-21673 being exploited?
There is no known exploitation of CVE-2021-21673 in the wild and no public exploit code.
Other vulnerabilities in Jenkins CAS Plugin
Sources
Also known as GHSA-2vvr-5757-qp87.