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Bug 816315 (CVE-2021-41103) - <app-containers/containerd-{1.4.11,1.5.7}: Possible container breakout (CVE-2021-41103)
Summary: <app-containers/containerd-{1.4.11,1.5.7}: Possible container breakout (CVE-2...
Alias: CVE-2021-41103
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Whiteboard: B2 [glsa?]
Depends on: 816468
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Reported: 2021-10-05 03:59 UTC by Sam James
Modified: 2022-01-01 10:25 UTC (History)
3 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-10-05 03:59:05 UTC
CVE-2021-41103 (

containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. A bug was found in containerd where container root directories and some plugins had insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as setuid), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.
Comment 1 John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2021-10-06 19:14:29 UTC
Please cleanup
Comment 2 John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2021-10-06 19:15:29 UTC
(In reply to John Helmert III from comment #1)
> Please cleanup

Oops, already done, thanks!