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CVE-2021-25318— rancher: API group not properly specified when creating Kubernetes RBAC resources

Quick assessment

Affected
Rancher Rancher
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.

Rancher Labs Rancher是美国Rancher Labs公司的一套开源的企业级容器管理平台。 Rancher 存在授权问题漏洞，该漏洞源于产品对于关键资源的管理缺少有效的权限管理，攻击者可通过该漏洞访问不该访问的资源。以下产品及版本受到影响：Rancher 2.5.9之前版本，Rancher 2.4.16之前版本。

CVSS 8.8 · High EPSS 1.05% · P61

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2021-25318

Vulnerability Information
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Vulnerability Title
rancher: API group not properly specified when creating Kubernetes RBAC resources
Source: CVE Program / CVE List V5
Vulnerability Description
A Incorrect Permission Assignment for Critical Resource vulnerability in Rancher allows users in the cluster to modify resources they should not have access to. This issue affects: Rancher versions prior to 2.5.9 ; Rancher versions prior to 2.4.16.
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
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
Rancher Labs Rancher 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Rancher Labs Rancher是美国Rancher Labs公司的一套开源的企业级容器管理平台。 Rancher 存在授权问题漏洞，该漏洞源于产品对于关键资源的管理缺少有效的权限管理，攻击者可通过该漏洞访问不该访问的资源。以下产品及版本受到影响：Rancher 2.5.9之前版本，Rancher 2.4.16之前版本。
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
Rancher Rancher Rancher ~ 2.5.9 -
Rancher Rancher Rancher ~ 2.4.16 -

II. Public POCs for CVE-2021-25318

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III. Intelligence Information for CVE-2021-25318

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Vendor Advisories for CVE-2021-25318 (1)

Same Patch Batch · Rancher · 2021-07-15 · 3 CVEs total

CVE-2021-25320 9.9 CRITICAL Rancher: Cloud credentials can be used through proxy API by users without access
CVE-2021-31999 8.8 HIGH Rancher: Privilege escalation vulnerability via malicious Connection header

IV. Related Vulnerabilities

Same product: Rancher
Same vendor: Rancher
Same weakness: CWE-732

V. Comments for CVE-2021-25318

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