Several security issues were fixed in runc.
It was discovered that runC incorrectly checked mount targets. An attacker with a malicious container image could possibly mount over the /proc directory and escalate privileges. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-16884)
9 March 2020
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in runc.
It was discovered that runC incorrectly checked mount targets. An attacker with a malicious container image could possibly mount over the /proc directory and escalate privileges. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-16884)
It was discovered that runC incorrectly performed access control. An attacker could possibly use this issue to escalate privileges. (CVE-2019-19921)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.
Vulmon