CVE-2019-18837 : Vulnerability Insights and Analysis
Learn about CVE-2019-18837, a vulnerability in crun versions prior to 0.10.5 allowing unauthorized access to files outside the container. Find mitigation steps and prevention measures here.
A vulnerability has been identified in crun versions prior to 0.10.5. The issue allows unauthorized access to files outside of the container due to inadequate verification of symbolic links.
Understanding CVE-2019-18837
This CVE pertains to a security vulnerability in crun versions before 0.10.5 that could lead to unauthorized access to files outside the container.
What is CVE-2019-18837?
CVE-2019-18837 is a vulnerability in crun versions prior to 0.10.5 that arises from a failure to properly verify if a target is a symbolic link when a specially crafted image is used. This flaw can result in unauthorized access to files located outside of the container.
The Impact of CVE-2019-18837
The vulnerability in CVE-2019-18837 could potentially allow malicious actors to access sensitive files outside of the container, compromising the security and integrity of the system.
Technical Details of CVE-2019-18837
This section provides technical details regarding the vulnerability.
Vulnerability Description
The vulnerability in crun before version 0.10.5 arises from the software's failure to adequately verify if a target is a symbolic link when a specially crafted image is used. The issue is present in the code files libcrun/linux.c and libcrun/chroot_realpath.c.
Affected Systems and Versions
- Product: crun
- Vendor: crun
- Versions Affected: before 0.10.5
Exploitation Mechanism
The vulnerability can be exploited by using a specially crafted image to trick the software into accessing files outside of the container through symbolic links.
Mitigation and Prevention
To address CVE-2019-18837, follow these mitigation and prevention steps:
Immediate Steps to Take
- Update crun to version 0.10.5 or later to mitigate the vulnerability.
- Avoid using untrusted or unknown container images.
Long-Term Security Practices
- Regularly update container software to the latest versions.
- Implement container security best practices to prevent similar vulnerabilities.
Patching and Updates
Ensure timely patching and updates for crun to address security vulnerabilities and protect the containerized environment.