// For flags

CVE-2021-21696

jenkins: Agent-to-controller access control allowed writing to sensitive directory used by Pipeline: Shared Groovy Libraries Plugin

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

Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the libs/ directory inside build directories when using the FilePath APIs, allowing attackers in control of agent processes to replace the code of a trusted library with a modified variant. This results in unsandboxed code execution in the Jenkins controller process.

Jenkins versiones 2.318 y anteriores, LTS versiones 2.303.2 y anteriores, no limitan el acceso de lectura/escritura del agente al directorio libs/ dentro de los directorios de construcción cuando son utilizadas las APIs FilePath, permitiendo a atacantes que controlan los procesos del agente reemplazar el código de una biblioteca confiable con una variante modificada. Esto resulta en una ejecución de código sin sandbox en el proceso del controlador de Jenkins

An incorrect permissions validation vulnerability was found in Jenkins. An agent process read/write access to the libs/ directory inside build directories when using the FilePath APIs is not limited. This allows attackers in control of agent processes to replace the code of a trusted library with a modified variant, resulting in unsandboxed code execution in the Jenkins controller process.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC
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"
 <= 2.303.2
Search vendor "Jenkins" for product "Jenkins" and version " <= 2.303.2"
lts
Affected
Jenkins
Search vendor "Jenkins"
 Jenkins
Search vendor "Jenkins" for product "Jenkins"
 <= 2.318
Search vendor "Jenkins" for product "Jenkins" and version " <= 2.318"
-
Affected