Arch Linux Security Advisory ASA-202107-70 ========================================== Severity: Medium Date : 2021-07-27 CVE-ID : CVE-2021-32760 Package : containerd Type : directory traversal Remote : No Link : https://security.archlinux.org/AVG-2174 Summary ======= The package containerd before version 1.5.4-1 is vulnerable to directory traversal. Resolution ========== Upgrade to 1.5.4-1. # pacman -Syu "containerd>=1.5.4-1" The problem has been fixed upstream in version 1.5.4. Workaround ========== As a workaround, ensure that users only pull images from trusted sources. Linux security modules (LSMs) like AppArmor can limit the files potentially affected by this bug through policies and profiles that prevent containerd from interacting with specific files. Description =========== A bug was found in containerd version prior to 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. Impact ====== A crafted container image could change file permissions on the host system, leading to potential denial of service or information disclosure. References ========== https://github.com/containerd/containerd/security/advisories/GHSA-c72p-9xmj-... https://github.com/containerd/containerd/commit/37a44de17d5d09e258e3c8c29d32... https://security.archlinux.org/CVE-2021-32760