CVE-2021-21687
jenkins: FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link
Severity Score
9.1
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not check agent-to-controller access to create symbolic links when unarchiving a symbolic link in FilePath#untar.
Jenkins versiones 2.318 y anteriores, LTS versiones 2.303.2 y anteriores, no comprueban el acceso agente-controlador para crear enlaces simbólicos cuando se desarchiva un enlace simbólico en FilePath#untar
An incorrect permissions validation vulnerability was found in Jenkins. The FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link, which may allow an attacker to get read and write access 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-862: Missing Authorization
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-2021-21687 | 2021-11-29 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2020324 | 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
| ||||||