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CVE-2021-21686

Good to know:

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Date: November 4, 2021

File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.

Language: Java

Severity Score

Related Resources (7)

https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
https://github.com/jenkinsci/jenkins/commit/5a245e42979abe4a26d41727c839521e36cedd74
https://github.com/jenkinsci/jenkins/commit/63cde2daadc705edf086f2213b48c8c547f98358
https://github.com/jenkinsci/jenkins
https://nvd.nist.gov/vuln/detail/CVE-2021-21686
https://github.com/jenkinsci/jenkins/commit/104c751d907919dd53f5090f84d53c671a66457b
https://www.mend.io/vulnerability-database/CVE-2021-21686

Severity Score

Weakness Type (CWE)

Improper Link Resolution Before File Access ('Link Following')

CWE-59

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-22

Top Fix

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Upgrade Version

Upgrade to version org.jenkins-ci.main:jenkins-core:2.303.3;org.jenkins-ci.main:jenkins-core:2.319

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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