CVE-2019-5736 — runc through 1

runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host runc binary (and consequently obtain host root access) by leveraging the ability to execute a command as root within one of these types of containers: (1) a new conta

01What is this vulnerability?

runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows attackers to overwrite the host runc binary (and consequently obtain host root access) by leveraging the ability to execute a command as root within one of these types of containers: (1) a new container with an attacker-controlled image, or (2) an existing container, to which the attacker previously had write…

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-02-11T00:00:00.000Z
• Last modified: 2024-08-04T20:01:52.208Z

09References

• github.com — https://github.com/opencontainers/runc/commit/6635b4f0c6af3810594d2770f662f34ddc…
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:0408
• github.com — https://github.com/rancher/runc-cve
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:0401
• github.com — https://github.com/docker/docker-ce/releases/tag/v18.09.2
• www.synology.com — https://www.synology.com/security/advisory/Synology_SA_19_06
• security.netapp.com — https://security.netapp.com/advisory/ntap-20190307-0008/
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:0303
• tools.cisco.com — https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2…
• github.com — https://github.com/q3k/cve-2019-5736-poc
• www.exploit-db.com — https://www.exploit-db.com/exploits/46359/
• github.com — https://github.com/opencontainers/runc/commit/0a8e4117e7f715d5fbeef398405813ce8e…
• aws.amazon.com — https://aws.amazon.com/security/security-bulletins/AWS-2019-002/
• www.openwall.com — https://www.openwall.com/lists/oss-security/2019/02/11/2
• kubernetes.io — https://kubernetes.io/blog/2019/02/11/runc-and-cve-2019-5736/
• access.redhat.com — https://access.redhat.com/security/cve/cve-2019-5736
• www.exploit-db.com — https://www.exploit-db.com/exploits/46369/
• access.redhat.com — https://access.redhat.com/errata/RHSA-2019:0304
• github.com — https://github.com/Frichetten/CVE-2019-5736-PoC
• support.hpe.com — https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpe…
• brauner.github.io — https://brauner.github.io/2019/02/12/privileged-containers.html
• www.twistlock.com — https://www.twistlock.com/2019/02/11/how-to-mitigate-cve-2019-5736-in-runc-and-d…
• cloud.google.com — https://cloud.google.com/kubernetes-engine/docs/security-bulletins#february-11-2…
• www.securityfocus.com — http://www.securityfocus.com/bid/106976
• access.redhat.com — https://access.redhat.com/security/vulnerabilities/runcescape
• blog.dragonsector.pl — https://blog.dragonsector.pl/2019/02/cve-2019-5736-escape-from-docker-and.html
• bugzilla.suse.com — https://bugzilla.suse.com/show_bug.cgi?id=1121967
• lists.apache.org — https://lists.apache.org/thread.html/b162dd624dc088cd634292f0402282a1d1d0ce853ba…
• lists.apache.org — https://lists.apache.org/thread.html/a258757af84c5074dc7bf932622020fd4f60cef65a8…
• www.openwall.com — http://www.openwall.com/lists/oss-security/2019/03/23/1