CVE-2019-16884 : Exploit Details and Defense Strategies
Learn about CVE-2019-16884, a vulnerability in 'runc' software allowing bypass of AppArmor restrictions in Docker. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
CVE-2019-16884 is a vulnerability found in version 1.0.0-rc8 of the software 'runc,' allowing the bypass of AppArmor restrictions. This flaw affects Docker version 19.03.2-ce and potentially other related products. The vulnerability stems from improper verification of mount targets in the file libcontainer/rootfs_linux.go, enabling a malicious Docker image to mount itself over a /proc directory.
Understanding CVE-2019-16884
This section provides insights into the nature and impact of the CVE-2019-16884 vulnerability.
What is CVE-2019-16884?
CVE-2019-16884 is a security vulnerability in the 'runc' software version 1.0.0-rc8, allowing the circumvention of AppArmor restrictions in Docker.
The Impact of CVE-2019-16884
The vulnerability enables a malicious Docker image to mount itself over a critical system directory, potentially leading to unauthorized access and manipulation of system resources.
Technical Details of CVE-2019-16884
Explore the technical aspects of the CVE-2019-16884 vulnerability.
Vulnerability Description
The vulnerability arises from the incorrect validation of mount targets in the file libcontainer/rootfs_linux.go within 'runc,' facilitating the exploitation of AppArmor restrictions.
Affected Systems and Versions
- Vendor: n/a
- Product: n/a
- Versions: All versions are affected.
Exploitation Mechanism
The flaw allows a malicious Docker image to mount itself over the /proc directory, potentially compromising system integrity and security.
Mitigation and Prevention
Discover the steps to mitigate and prevent the CVE-2019-16884 vulnerability.
Immediate Steps to Take
- Update 'runc' software to a patched version.
- Monitor for any unauthorized mount operations within Docker containers.
Long-Term Security Practices
- Implement container security best practices to prevent similar vulnerabilities.
- Regularly audit and review Docker images for security risks.
Patching and Updates
Ensure timely application of security patches and updates to 'runc' and related software to address the CVE-2019-16884 vulnerability.