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CVE-2021-21284— privilege escalation in Moby

Quick assessment

Affected
moby moby
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.

Docker是美国Docker公司的一款开源的应用容器引擎。该产品支持在Linux系统上创建一个容器（轻量级虚拟机）并部署和运行应用程序，以及通过配置文件实现应用程序的自动化安装、部署和升级。 Docker 9.03.15 版本之前和 20.10.3 版本存在路径遍历漏洞，该漏洞源于被映射的命名空间中的根用户可以访问主机文件系统。

CVSS 6.8 · Medium EPSS 1.06% · P63

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-21284

Vulnerability Information
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Vulnerability Title
privilege escalation in Moby
Source: CVE Program / CVE List V5
Vulnerability Description
In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the --userns-remap option in which access to remapped root allows privilege escalation to real root. When using "--userns-remap", if the root user in the remapped namespace has access to the host filesystem they can modify files under "/var/lib/docker/<remapping>" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Docker 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Docker是美国Docker公司的一款开源的应用容器引擎。该产品支持在Linux系统上创建一个容器（轻量级虚拟机）并部署和运行应用程序，以及通过配置文件实现应用程序的自动化安装、部署和升级。 Docker 9.03.15 版本之前和 20.10.3 版本存在路径遍历漏洞，该漏洞源于被映射的命名空间中的根用户可以访问主机文件系统。
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
moby moby < 19.03.15 -

II. Public POCs for CVE-2021-21284

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III. Intelligence Information for CVE-2021-21284

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Patches & Fixes for CVE-2021-21284 (1)

Vendor Advisories for CVE-2021-21284 (4)

Other References for CVE-2021-21284 (3)

IV. Related Vulnerabilities

Same product: moby
Same vendor: moby
Same weakness: CWE-22

V. Comments for CVE-2021-21284

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