Container Breakout Vulnerability in runc of Docker and Other Products
CVE-2019-5736

8.6HIGH

Key Information:

Vendor

Docker

Status
Docker
Vendor
CVE Published:
11 February 2019

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 55%

What is CVE-2019-5736?

The vulnerability allows an attacker with root privileges in a container to overwrite the host runc binary, potentially gaining root access on the host system. This exploitation can occur through either the deployment of a malicious container image or via existing containers where the attacker had previous write access. The issue stems from improper handling of file descriptors related to /proc/self/exe, enabling a path for attackers to execute arbitrary commands with escalated privileges.

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-5736-PoC
Created by Frichetten

cve-2019-5736-poc
Created by q3k

Metasploit exploit module for CVE-2019-5736
Created by Rapid7

References

https://github.com/opencontainers/runc/commit/6635b4f0c6a...
https://access.redhat.com/errata/RHSA-2019:0408
vendor-advisory
https://github.com/rancher/runc-cve

EPSS Score

55% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.