CVE-2021-21691
jenkins: Creating symbolic links is possible without the symlink permission
Severity Score
9.8
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
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.
Una creación de enlaces simbólicos es posible sin el permiso de control de acceso del agente-controlador "symlink" en Jenkins versiones 2.318 y anteriores, LTS versiones 2.303.2 y anteriores
A vulnerability was found in Jenkins which failed to correctly validate permissions. This flaw allowed any user to create symbolic links regardless if they had the symlink permission. It may allow an attacker to read and write to arbitrary files on the Jenkins controller file system.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-01-04 CVE Reserved
- 2021-11-04 CVE Published
- 2024-07-20 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-59: Improper Link Resolution Before File Access ('Link Following')
- CWE-276: Incorrect Default Permissions
CAPEC
References (3)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455 | 2023-11-22 | |
| https://access.redhat.com/security/cve/CVE-2021-21691 | 2021-11-29 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2020338 | 2021-11-29 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Jenkins Search vendor "Jenkins" | Jenkins Search vendor "Jenkins" for product "Jenkins" | < 2.303.3 Search vendor "Jenkins" for product "Jenkins" and version " < 2.303.3" | lts |
Affected
| ||||||
| Jenkins Search vendor "Jenkins" | Jenkins Search vendor "Jenkins" for product "Jenkins" | < 2.319 Search vendor "Jenkins" for product "Jenkins" and version " < 2.319" | - |
Affected
| ||||||