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CVE-2021-32760— Archive package allows chmod of file outside of unpack target directory

Quick assessment

Affected
containerd containerd
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.

containerd是美国阿帕奇（Apache）基金会的一个容器守护进程。该进程根据 RunC OCI 规范负责控制宿主机上容器的完整周期。 Containerd 1.4.8之前版本和1.5.4之前版本存在安全漏洞，该漏洞源于一个特殊制作的容器映像会导致主机文件系统中现有文件的Unix文件权限发生更改。对文件权限的更改可以拒绝对文件所有者的访问，扩大对其他人的访问。

CVSS 5.0 · Medium EPSS 1.59% · P75
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I. Basic Information for CVE-2021-32760

Vulnerability Information
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Vulnerability Title
Archive package allows chmod of file outside of unpack target directory
Source: CVE Program / CVE List V5
Vulnerability Description
containerd is a container runtime. A bug was found in containerd versions prior to 1.4.8 and 1.5.4 where pulling and extracting a specially-crafted container image can result in Unix file permission changes for existing files in the host’s filesystem. Changes to file permissions can deny access to the expected owner of the file, widen access to others, or set extended bits like setuid, setgid, and sticky. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. This bug has been fixed in containerd 1.5.4 and 1.4.8. As a workaround, ensure that users only pull images from trusted sources. Linux security modules (LSMs) like SELinux and AppArmor can limit the files potentially affected by this bug through policies and profiles that prevent containerd from interacting with specific files.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
将资源暴露给错误范围
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Containerd 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
containerd是美国阿帕奇（Apache）基金会的一个容器守护进程。该进程根据 RunC OCI 规范负责控制宿主机上容器的完整周期。 Containerd 1.4.8之前版本和1.5.4之前版本存在安全漏洞，该漏洞源于一个特殊制作的容器映像会导致主机文件系统中现有文件的Unix文件权限发生更改。对文件权限的更改可以拒绝对文件所有者的访问，扩大对其他人的访问。
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
containerd containerd <= 1.4.7 -

II. Public POCs for CVE-2021-32760

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III. Intelligence Information for CVE-2021-32760

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Vendor Advisories for CVE-2021-32760 (1)

Mailing List Discussions for CVE-2021-32760 (1)

Other References for CVE-2021-32760 (2)

IV. Related Vulnerabilities

Same product: containerd
Same vendor: containerd
Same weakness: CWE-668

V. Comments for CVE-2021-32760

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