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How the CVE Works:
The vulnerability in containerd arises due to an integer overflow in the User ID (UID) and Group ID (GID) handling mechanism. When a container is launched with a UID or GID larger than the maximum 32-bit signed integer value (2,147,483,647), an overflow occurs. This overflow causes the container to run with an effective UID of 0, which is the root user. This unintended elevation of privileges can lead to unauthorized access and unexpected behavior, especially in environments where containers are required to run as non-root users for security reasons. The issue is particularly critical in multi-tenant environments where strict user isolation is necessary.
DailyCVE Form:
Platform: containerd
Version: < 1.7.0, 1.6.0
Vulnerability: Integer Overflow
Severity: Moderate
Date: Mar 17, 2025
What Undercode Say:
Exploitation:
1. Exploit Code Example:
docker run --user 2147483648:2147483648 -it vulnerable_image
This command triggers the overflow by setting a UID/GID beyond the 32-bit signed integer limit.
2. Impact:
- The container runs as root, bypassing non-root user restrictions.
- Potential privilege escalation in shared environments.
3. Exploit Mitigation:
- Restrict untrusted users from launching containers with custom UID/GID.
- Monitor container runtime logs for unusual UID/GID values.
Protection:
1. Update containerd:
sudo apt-get update && sudo apt-get install containerd
Ensure the version is patched (>= 1.7.0 or >= 1.6.0 with fixes).
2. Runtime Protection:
- Use seccomp profiles to restrict syscalls related to UID/GID manipulation.
- Implement AppArmor or SELinux policies to enforce non-root container execution.
3. Audit Script:
Check for vulnerable containerd versions containerd --version | grep -E '1.6.|1.5.|1.4.'
If output matches, the system is vulnerable.
4. Workarounds:
- Restrict image sources to trusted registries.
- Use Kubernetes admission controllers to enforce UID/GID limits.
5. Monitoring:
- Set up alerts for containers running as root.
- Use Falco or similar tools to detect UID/GID anomalies.
6. References:
- bash
- bash
By following these steps, organizations can mitigate the risks associated with this vulnerability and ensure secure container runtime environments.
References:
Reported By: https://github.com/advisories/GHSA-265r-hfxg-fhmg
Extra Source Hub:
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