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Ubuntu 16.04 LTS USN-6088-2: Addressing RunC Escalation Threats

ubuntu
Calendar Grey May 23, 2023
Dist Ubuntu Esm H88
Comprehend the mechanisms through which Ubuntu's USN-6088-2 mitigates serious runC vulnerabilities that could lead to unauthorized privilege elevation.
Several security issues were fixed in runC.

Summary

Several security issues were fixed in runC.

Software Description:

- runc: Open Container Project

Details:

USN-6088-1 fixed vulnerabilities in runC. This update provides

the corresponding updates for Ubuntu 16.04 LTS.

It was discovered that runC incorrectly performed access control when

mounting /proc to non-directories. An attacker could possibly use

this issue to escalate privileges.

(CVE-2019-19921)

Felix Wilhelm discovered that runC incorrecly handled netlink

messages. An attacker could possibly use

this issue to escalate privileges. (CVE-2021-43784)

Andrew G. Morgan discovered that runC incorrectly set

inherited process capabilities inside the container.

An attacker could possibly use this issue to

escalate privileges. (CVE-2022-29162)

Original advisory details:

 It was discovered that runC incorrectly made /sys/fs/cgroup

 writable when in rootless mode. An attacker could possibly

 use this issue to escalate privileges. (CVE-2023-25809)

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory security update privilege escalation access control ubuntu container security runC

Update Instructions

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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   runc 1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4

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

References

  https://ubuntu.com/security/notices/USN-6088-2

  https://ubuntu.com/security/notices/USN-6088-1

  CVE-2019-19921, CVE-2021-43784, CVE-2022-29162, CVE-2023-25809,

  CVE-2023-27561, CVE-2023-28642

Severity
important
Lowest
Low
Medium
High
Critical

May 23, 2023

Topics%20covered

Topics Covered

security advisory security update privilege escalation access control ubuntu container security runC

Package Information

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