GLSA 201701-34: runC: Privilege escalation

http://security.gentoo.org/

Severity:	normal
Title:	runC: Privilege escalation
Date:	01/12/2017
Bugs:	#605378
ID:	201701-34

Synopsis

A vulnerability in runC could lead to privilege escalation.

Background

RunC is a CLI tool for spawning and running containers according to the OCI specification.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
app-emulation/runc	< 1.0.0_rc2-r2	>= 1.0.0_rc2-r2	All supported architectures

Description

A vulnerability was discovered in runC that allows additional container processes via ‘runc exec’ to be ptraced by the pid 1 of the container. This allows the main processes of the container, if running as root, to gain access to file-descriptors of these new processes.

Impact

An attacker, who is able to successfully escape the container or modify runC’s state before process initialization, could escalate privileges.

Workaround

There is no known workaround at this time.

Resolution

All runC users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=app-emulation/runc-1.0.0_rc2-r2"

References

CVE-2016-9962

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201701-34.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.