CVE-2021-21691 : Creating symbolic links is possible without the 'symlink' agent-to-controller access control permission in Jenkins 2.318

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.

Published 2021-11-04 17:15:09

Updated 2023-11-22 21:23:05

Source Jenkins Project

View at NVD, CVE.org

Threat overview for CVE-2021-21691

Top countries where our scanners detected CVE-2021-21691

Top open port discovered on systems with this issue 80

IPs affected by CVE-2021-21691 27,527

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-21691!

^*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-2021-21691

Probability of exploitation activity in the next 30 days: 0.24%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 61 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-21691

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-21691

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)
CWE-863 Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

Assigned by: jenkinsci-cert@googlegroups.com (Primary)

References for CVE-2021-21691

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

Jenkins Security Advisory 2021-11-04
Vendor Advisory

CVEs referencing this url

Products affected by CVE-2021-21691