CVE-2021-21686 : File path filters in the agent-to-controller security subsystem of Jenkins 2.318

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.

Published 2021-11-04 17:15:08

Updated 2023-11-22 21:18:15

Source Jenkins Project

View at NVD, CVE.org

Products affected by CVE-2021-21686

Jenkins » Jenkins » LTS Edition
Versions before (<) 2.303.3
cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
Matching versions
Jenkins » Jenkins »
Versions before (<) 2.319
cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*
Matching versions

Threat overview for CVE-2021-21686

Top countries where our scanners detected CVE-2021-21686

Top open port discovered on systems with this issue 80

IPs affected by CVE-2021-21686 29,384

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-21686!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-21686

EPSS FAQ

0.21%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 59 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21686

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:N	8.6	4.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: None
8.1	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	2.8	5.2	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: None

CWE ids for CVE-2021-21686

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Assigned by: jenkinsci-cert@googlegroups.com (Secondary)
CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-21686

https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455

Jenkins Security Advisory 2021-11-04
Vendor Advisory

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