1. Ubuntu Security Notices
  2. USN-4960-1

USN-4960-1: runC vulnerability

Publication date

19 May 2021

Overview

runC could be made to overwrite files as the administrator.

Releases

Packages

  • runc - Open Container Project

Details

Etienne Champetier discovered that runC incorrectly checked mount targets.
An attacker with a malicious container image could possibly mount the host
filesystem into the container and escalate privileges.

Etienne Champetier discovered that runC incorrectly checked mount targets.
An attacker with a malicious container image could possibly mount the host
filesystem into the container and escalate privileges.

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
21.04 hirsute runc –  1.0.0~rc93-0ubuntu1.1
20.10 groovy runc –  1.0.0~rc93-0ubuntu1~20.10.2
20.04 focal runc –  1.0.0~rc93-0ubuntu1~20.04.2
18.04 bionic runc –  1.0.0~rc93-0ubuntu1~18.04.2

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References

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