Critical runC Container Escape Vulnerability (CVE-2019-5736) Threat Alert

Critical runC Container Escape Vulnerability (CVE-2019-5736) Threat Alert

fevereiro 18, 2019 | Adeline Zhang
  • Overview

RUNC is a CLI tool for spawning and running containers according to the Open Container Initiative (OCI) specification. As the core of the Docker, runC can be called for creating, running, and destructing containers.

Recently, runC, as used in Docker before 18.09.2, has been found to contain a critical vulnerability (CVE-2019-5736), which allows attackers to overwrite the runC binary on the host and consequently execute arbitrary commands on the host with root privileges. To exploit this vulnerability, there must be either of the following types of containers: (1) a new container with an attacker-controlled image; (2) an existing container, to which the attacker previously had write access, that can be attached with docker exec. Now, new versions to fix this vulnerability are available on GitHub.

Reference links:

  • Scope of Impact

Platform or Product Affected Version Unaffected Version
Docker Version < 18.09.2 Version = 18.09.2
runC Version <= 1.0-rc6 ——


  • Solution

To fix this vulnerability, it is recommended that all container images be audited and trusted and that runC technical developers develop their software versions as soon as possible.

To fix the runC vulnerability, visit the following GitHub link:

This vulnerability has been fixed in Docker 18.09.2. Users are advised to upgrade Docker to 18.09.2 by downloading the update from the following link:

For the Red Hat platform, visit the following link:

For the AWS platform, visit the following link:

For Kubernetes, visit the following link:

  • Statement

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  • About NSFOCUS

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