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CVE-2021-25741— Symlink Exchange Can Allow Host Filesystem Access

Quick assessment

Affected
Kubernetes Kubernetes
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubernetes是美国Linux基金会的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。 kubernetes 存在安全漏洞，攻击者可利用该漏洞通过创建具有精心编制的子路径卷装载的pod，以访问卷外的文件和目录，包括主机节点的文件系统上的文件和目录

CVSS 8.8 · High EPSS 7.96% · P95

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2021-25741

Vulnerability Information
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Vulnerability Title
Symlink Exchange Can Allow Host Filesystem Access
Source: CVE Program / CVE List V5
Vulnerability Description
A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes是美国Linux基金会的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。 kubernetes 存在安全漏洞，攻击者可利用该漏洞通过创建具有精心编制的子路径卷装载的pod，以访问卷外的文件和目录，包括主机节点的文件系统上的文件和目录
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
Kubernetes Kubernetes unspecified ~ 1.19.14 -

II. Public POCs for CVE-2021-25741

# POC Description Source Link Shenlong Link
1 Exploit for CVE-2021-25741 vulnerability https://github.com/Betep0k/CVE-2021-25741 POC Details
2 fork on Betep0k/CVE-2021-25741/fork whose images is useless and test on metarget https://github.com/cdxiaodong/CVE-2021-25741 POC Details
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III. Intelligence Information for CVE-2021-25741

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Vendor Advisories for CVE-2021-25741 (1)

Other References for CVE-2021-25741 (1)

Same Patch Batch · Kubernetes · 2021-09-20 · 3 CVEs total

CVE-2020-8561 4.1 MEDIUM Webhook redirect in kube-apiserver
CVE-2021-25740 3.1 LOW Holes in EndpointSlice Validation Enable Host Network Hijack

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes
Same weakness: CWE-20

V. Comments for CVE-2021-25741

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