CVE-2021-21691
First published: Thu Nov 04 2021(Updated: )
Creating symbolic links is possible without the 'symlink' agent-to-controller access control permission in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.
Credit: jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Jenkins Jenkins | <2.303.3 | |
| Jenkins Jenkins | <2.319 | |
| redhat/jenkins | <2.319 | 2.319 |
| redhat/jenkins LTS | <2.303.3 | 2.303.3 |
| maven/org.jenkins-ci.main:jenkins-core | <=2.303.2 | 2.303.3 |
| maven/org.jenkins-ci.main:jenkins-core | >=2.304<=2.318 | 2.319 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2021-21691
- https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
- https://github.com/jenkinsci/jenkins/commit/63cde2daadc705edf086f2213b48c8c547f98358
- https://github.com/advisories/GHSA-2c79-h2h5-g3fw (Advisory)
- https://access.redhat.com/errata/RHSA-2021:4833
- https://access.redhat.com/errata/RHSA-2021:4829
- https://access.redhat.com/errata/RHSA-2021:4801
- https://access.redhat.com/errata/RHSA-2021:4799
- https://access.redhat.com/errata/RHSA-2021:4827
- https://access.redhat.com/security/cve/cve-2021-21691
- https://bugzilla.redhat.com/show_bug.cgi?id=2020338
Frequently Asked Questions
What is CVE-2021-21691?
CVE-2021-21691 is a vulnerability in Jenkins that allows the creation of symbolic links without the proper access control permission.
What is the severity of CVE-2021-21691?
CVE-2021-21691 has a severity rating of 9.8, which is considered critical.
How does CVE-2021-21691 affect Jenkins?
CVE-2021-21691 affects Jenkins versions 2.318 and earlier, as well as LTS 2.303.2 and earlier.
How can I fix CVE-2021-21691?
To fix CVE-2021-21691, you should update Jenkins to version 2.319 or version 2.303.3 for LTS.
Where can I find more information about CVE-2021-21691?
You can find more information about CVE-2021-21691 on the Jenkins security advisory and the Red Hat website.
- collector/nvd-index
- collector/nvd-cve
- collector/nvd-api
- collector/github-advisory-latest
- alias/GHSA-2c79-h2h5-g3fw
- alias/CVE-2021-21691
- collector/github-advisory
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- vendor/jenkins
- canonical/jenkins jenkins
- package-manager/maven
- package-manager/redhat