CVE-2021-21686
Quick assessment
Affected
Jenkins project Jenkins
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Jenkins是Jenkins开源的一个应用软件。一个开源自动化服务器Jenkins提供了数百个插件来支持构建，部署和自动化任何项目。 Jenkins 存在后置链接漏洞，该漏洞源于 Jenkins 2.318 及更早版本、LTS 2.303.2 及更早版本的代理到控制器安全子系统中的文件路径过滤器不规范化路径，允许操作遵循符号链接到允许的外部目录。
Possible ATT&CK Techniques 1 AI
T1083 · File and Directory Discovery
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I. Basic Information for CVE-2021-21686
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Jenkins 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jenkins是Jenkins开源的一个应用软件。一个开源自动化服务器Jenkins提供了数百个插件来支持构建，部署和自动化任何项目。 Jenkins 存在后置链接漏洞，该漏洞源于 Jenkins 2.318 及更早版本、LTS 2.303.2 及更早版本的代理到控制器安全子系统中的文件路径过滤器不规范化路径，允许操作遵循符号链接到允许的外部目录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Jenkins project | Jenkins | unspecified ~ 2.318 | - |
|
II. Public POCs for CVE-2021-21686
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2021-21686 (1)
-
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455 x_refsource_CONFIRM
Same Patch Batch · Jenkins project · 2021-11-04 · 14 CVEs total
| CVE-2021-21693 | Jenkins 授权问题漏洞 | |
| CVE-2021-21685 | Jenkins 访问控制错误漏洞 | |
| CVE-2021-21687 | Jenkins 安全漏洞 | |
| CVE-2021-21688 | Jenkins 安全漏洞 | |
| CVE-2021-21689 | Jenkins 安全漏洞 | |
| CVE-2021-21690 | Jenkins 安全漏洞 | |
| CVE-2021-21691 | Jenkins 安全漏洞 | |
| CVE-2021-21692 | Jenkins 安全漏洞 | |
| CVE-2021-21694 | Jenkins 安全漏洞 | |
| CVE-2021-21695 | Jenkins 后置链接漏洞 | |
| CVE-2021-21696 | Jenkins 安全漏洞 | |
| CVE-2021-21697 | Jenkins 安全漏洞 | |
| CVE-2021-21698 | Jenkins 路径遍历漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2021-21686
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