Ubuntu 21.04: 4960-1 Critical: runC File Overwrite Threat

ubuntu

May 19, 2021

runC could be made to overwrite files as the administrator.

Summary

runC could be made to overwrite files as the administrator.

Software Description:

- 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.

Topics Covered

security advisory critical software update privilege escalation file overwrite Ubuntu ubuntu runC mount targets

Update Instructions

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

Ubuntu 21.04:
  runc                            1.0.0~rc93-0ubuntu1.1

Ubuntu 20.10:
  runc                            1.0.0~rc93-0ubuntu1~20.10.2

Ubuntu 20.04 LTS:
  runc                            1.0.0~rc93-0ubuntu1~20.04.2

Ubuntu 18.04 LTS:
  runc                            1.0.0~rc93-0ubuntu1~18.04.2

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