CVE-2021-32760

CVE Details

Release Date:	2021-07-19
Impact:	None	What is this?

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.

See more information about CVE-2021-32760 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	6.3
Vector String:	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Version:	3.0
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	Required
Scope:	Unchanged
Confidentiality Impact:	Low
Integrity Impact:	Low
Availability Impact:	Low

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (containerd)	ELSA-2021-15790	2021-07-23
Oracle Linux version 7 (containerd)	ELSA-2021-9373	2021-07-23
Oracle Linux version 7 (docker-cli)	ELSA-2021-15790	2021-07-23
Oracle Linux version 7 (docker-cli)	ELSA-2021-9373	2021-07-23
Oracle Linux version 7 (docker-engine)	ELSA-2021-15790	2021-07-23
Oracle Linux version 7 (docker-engine)	ELSA-2021-9373	2021-07-23