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CVE-2021-31999— Rancher: Privilege escalation vulnerability via malicious Connection header

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 Labs Rancher 存在安全漏洞，该漏洞源于在Rancher的安全决策漏洞中依赖不可信的输入。攻击者可利用该漏洞通过伪造“Impersonate-User”或“Impersonate-Group”头充当集群中的其他用户。

CVSS 8.8 · High EPSS 1.05% · P61
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I. Basic Information for CVE-2021-31999

Vulnerability Information
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Vulnerability Title
Rancher: Privilege escalation vulnerability via malicious Connection header
Source: CVE Program / CVE List V5
Vulnerability Description
A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. 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
在安全决策中依赖未经信任的输入
Source: CVE Program / CVE List V5
Vulnerability Title
Rancher Labs Rancher 安全漏洞
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 Labs Rancher 存在安全漏洞，该漏洞源于在Rancher的安全决策漏洞中依赖不可信的输入。攻击者可利用该漏洞通过伪造“Impersonate-User”或“Impersonate-Group”头充当集群中的其他用户。
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 SUSE Linux Enterprise Server 15 Rancher ~ 2.4.16 -

II. Public POCs for CVE-2021-31999

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III. Intelligence Information for CVE-2021-31999

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Vendor Advisories for CVE-2021-31999 (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-2021-25318 8.8 HIGH rancher: API group not properly specified when creating Kubernetes RBAC resources

IV. Related Vulnerabilities

Same product: Rancher
Same vendor: Rancher
Same weakness: CWE-807

V. Comments for CVE-2021-31999

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