Race condition in RunC - CVE-2016-9962

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Main Vulnerability Database Vulnerabilities #VU12804

Race condition in RunC - CVE-2016-9962

Published: May 17, 2018 / Updated: July 15, 2020


Vulnerability identifier: #VU12804
CSH Severity: Low
CVSS v4: 9.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H]
CVE-ID: CVE-2016-9962
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists due to allowing 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 during the initialization and can lead to container escapes or modification of runC state before the process is fully placed inside the container. A local attacker can execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in system compromise.

Affected software

RunC
Arch Linux
Gentoo Linux
Amazon Linux AMI
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Fedora
docker (Alpine package)
runc
docker-latest
docker

How to mitigate CVE-2016-9962

Install update from vendor's website.

docker (Alpine package) - update to 1.12.6-r0
runc - addressed in versions 1.0.0-3.rc2.gitc91b5be.fc24, 1.0.0-3.rc2.gitc91b5be.fc25, 1.0.0-5.rc2.gitc91b5be.fc24, 1.0.0-6.git75f8da7.fc25.2, 1.0.0-7.git6394544.fc25.2, 1.0.1-1.gitc5ec254.fc25
docker-latest - addressed in versions 1.12.6-1.git51ef5a8.fc24, 1.12.6-2.git51ef5a8.fc25
docker - update to 1.12.6-3.git51ef5a8.fc25

External References

Related Security Bulletins