CVE-2021-21686: Path Traversal
First published: Thu Nov 04 2021(Updated: )
File path filters do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.
Credit: jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/jenkins | <2.319 | 2.319 |
| redhat/jenkins LTS | <2.303.3 | 2.303.3 |
| Jenkins Jenkins | <2.303.3 | |
| Jenkins Jenkins | <2.319 | |
| maven/org.jenkins-ci.main:jenkins-core | >=2.304<=2.318 | 2.319 |
| maven/org.jenkins-ci.main:jenkins-core | <2.303.2 | 2.303.3 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2021-21686
- https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
- https://github.com/jenkinsci/jenkins/commit/104c751d907919dd53f5090f84d53c671a66457b
- https://github.com/jenkinsci/jenkins/commit/5a245e42979abe4a26d41727c839521e36cedd74
- https://github.com/jenkinsci/jenkins/commit/63cde2daadc705edf086f2213b48c8c547f98358
- https://github.com/advisories/GHSA-4g38-hrm4-rg94 (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-2021-21686
- https://bugzilla.redhat.com/show_bug.cgi?id=2020323
Frequently Asked Questions
What is CVE-2021-21686?
CVE-2021-21686 is a vulnerability in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier, which allows operations to follow symbolic links to outside allowed directories.
How does CVE-2021-21686 impact Jenkins?
CVE-2021-21686 allows attackers to exploit file path filters in Jenkins, potentially leading to unauthorized access to sensitive information or remote code execution.
What is the severity of CVE-2021-21686?
CVE-2021-21686 has a severity rating of 8.1 (high).
Is there a fix for CVE-2021-21686?
Yes, the fix for CVE-2021-21686 is available in Jenkins version 2.319 and Jenkins LTS version 2.303.3.
Where can I find more information about CVE-2021-21686?
You can find more information about CVE-2021-21686 on the Jenkins Security Advisory page (https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455) and the Red Hat Errata pages (https://access.redhat.com/errata/RHSA-2021:4833, https://access.redhat.com/errata/RHSA-2021:4829).
- collector/nvd-index
- collector/nvd-api
- collector/github-advisory-latest
- alias/GHSA-4g38-hrm4-rg94
- alias/CVE-2021-21686
- collector/nvd-cve
- collector/github-advisory
- agent/type
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- agent/weakness
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- agent/author
- agent/severity
- collector/redhat-bugzilla
- source/Red Hat
- agent/software-canonical-lookup
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/event
- agent/tags
- agent/description
- agent/trending
- vendor/jenkins
- canonical/jenkins jenkins
- package-manager/maven
- package-manager/redhat