Bug 816315 (CVE-2021-41103)

Summary:	<app-containers/containerd-{1.4.11,1.5.7}: Possible container breakout (CVE-2021-41103)
Product:	Gentoo Security	Reporter:	Sam James <sam>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal	CC:	ajak, gyakovlev, hydrapolic, williamh
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:	B2 [glsa+]
Package list:		Runtime testing required:	---
Bug Depends on:	816468
Bug Blocks:

Description Sam James archtester

2021-10-05 03:59:05 UTC

CVE-2021-41103 (https://github.com/containerd/containerd/commit/5b46e404f6b9f661a205e28d59c982d3634148f8):

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

2021-10-06 19:14:29 UTC

Please cleanup

Comment 2 John Helmert III archtester

2021-10-06 19:15:29 UTC

(In reply to John Helmert III from comment #1)
> Please cleanup

Oops, already done, thanks!

Comment 3 Larry the Git Cow gentoo-dev

2024-01-31 12:31:28 UTC

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/data/glsa.git/commit/?id=f9feb611eaa9a3e053e61253ddab0e4d85b21cd9

commit f9feb611eaa9a3e053e61253ddab0e4d85b21cd9
Author:     GLSAMaker <glsamaker@gentoo.org>
AuthorDate: 2024-01-31 12:30:06 +0000
Commit:     Hans de Graaff <graaff@gentoo.org>
CommitDate: 2024-01-31 12:31:16 +0000

    [ GLSA 202401-31 ] containerd: Multiple Vulnerabilities
    
    Bug: https://bugs.gentoo.org/802948
    Bug: https://bugs.gentoo.org/816315
    Bug: https://bugs.gentoo.org/834689
    Bug: https://bugs.gentoo.org/835917
    Bug: https://bugs.gentoo.org/850124
    Bug: https://bugs.gentoo.org/884803
    Signed-off-by: GLSAMaker <glsamaker@gentoo.org>
    Signed-off-by: Hans de Graaff <graaff@gentoo.org>

 glsa-202401-31.xml | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)