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AUSCERT External Security Bulletin Redistribution
ESB-2021.3275
USN-5100-1: containerd vulnerability
5 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: containerd
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Increased Privileges -- Existing Account
Modify Arbitrary Files -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-41103
Original Bulletin:
https://ubuntu.com/security/notices/USN-5100-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running containerd check for an updated version of the software for
their operating system.
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USN-5100-1: containerd vulnerability
04 October 2021
containerd would allow unintended access to files.
Releases
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o containerd - daemon to control runC
Details
It was discovered that containerd insufficiently restricted permissions on
container root and plugin directories. If a user or automated system were
tricked into launching a specially crafted container image, a remote
attacker could traverse directory contents and modify files and execute
programs on the host filesystem, possibly leading to privilege escalation.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o containerd - 1.5.2-0ubuntu1~21.04.3
Ubuntu 20.04
o containerd - 1.5.2-0ubuntu1~20.04.3
Ubuntu 18.04
o containerd - 1.5.2-0ubuntu1~18.04.3
After a standard system update you need to restart containerd to make
all the necessary changes.
References
o CVE-2021-41103
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