CVE-2021-21639

jenkins: lack of type validation in agent related REST API

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Jenkins 2.286 and earlier, LTS 2.277.1 and earlier does not validate the type of object created after loading the data submitted to the `config.xml` REST API endpoint of a node, allowing attackers with Computer/Configure permission to replace a node with one of a different type.

Jenkins versiones 2.286 y anteriores, LTS versiones 2.277.1 y anteriores, no comprueba el tipo de objeto diseñado después de cargar los datos enviados al endpoint de la API REST "config.xml" de un nodo, permitiendo a atacantes con permiso Computer/Configure reemplazar un nodo con uno de un tipo diferente

A flaw was found in Jenkins. Due to lack of validation of type of object created after loading the data submitted to the config.xml REST API endpoint of a node, an attackers with Computer/Configure permission are able to replace a node with one of a different type.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-04 CVE Reserved
2021-04-07 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (4)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2021/04/07/2	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.jenkins.io/security/advisory/2021-04-07/#SECURITY-1721	2023-10-25
https://access.redhat.com/security/cve/CVE-2021-21639	2021-07-27
https://bugzilla.redhat.com/show_bug.cgi?id=1947102	2021-07-27

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"				<= 2.277.1 Search vendor "Jenkins" for product "Jenkins" and version " <= 2.277.1"		lts		Affected
Jenkins Search vendor "Jenkins"		Jenkins Search vendor "Jenkins" for product "Jenkins"				<= 2.286 Search vendor "Jenkins" for product "Jenkins" and version " <= 2.286"		-		Affected