Ubuntu has released urgent security patches for Docker vulnerabilities (CVE-2023-28840, CVE-2024-23651, etc.) affecting multiple LTS versions. Learn how to update Docker.io and secure your container environment against attacks, data leaks, and firewall bypass exploits.
Severe Docker Security Flaws Discovered
Recent security audits uncovered critical vulnerabilities in Docker, the leading containerization platform. These flaws could allow attackers to:
Inject malicious packets into active connections (CVE-2023-28840, CVE-2023-28841)
Expose sensitive data via BuildKit cache mishandling (CVE-2024-23651)
Delete arbitrary files due to path verification failures (CVE-2024-23652)
Trigger undefined behavior from parallel operation errors (CVE-2024-36621, CVE-2024-36623)
Affected Ubuntu Versions:
Ubuntu 24.04 LTS
Ubuntu 22.04 LTS
Ubuntu 20.04 ESM
Ubuntu 18.04 ESM
How These Docker Vulnerabilities Impact You
1. Network Exploits (CVE-2023-28840 Series)
Discovered by Cory Snider, these flaws let attackers bypass firewalls or launch denial-of-service (DoS) attacks by manipulating packet encapsulation. Ubuntu 22.04/20.04/18.04 users are at highest risk.
2. BuildKit Data Leaks (CVE-2024-23651)
Rory McNamara found that Docker’s BuildKit toolkit improperly cached data, potentially exposing API keys, credentials, or proprietary code.
3. Arbitrary File Deletion (CVE-2024-23652)
A separate BuildKit flaw allowed attackers to delete critical system files, leading to crashes or privilege escalation.
4. Undefined Behavior Risks (CVE-2024-36621/36623)
Race conditions in Docker’s parallel operations could cause crashes or memory corruption, destabilizing production environments.
How to Fix Docker Security Issues
Update Instructions
Run these commands based on your Ubuntu version:
Ubuntu 24.04 LTS:
sudo apt update && sudo apt install golang-github-docker-docker-dev=20.10.25+dfsg1-2ubuntu1+esm2 Ubuntu 22.04/20.04/18.04 LTS:
sudo apt update && sudo apt install docker.io=20.10.21-0ubuntu1~[VERSION].X+esmX (Replace [VERSION] with your OS release.)
Enterprise Users:
For extended security coverage, Ubuntu Pro offers 10-year patches for 25,000+ packages, free for up to 5 machines.
👉 Learn more about Ubuntu Pro
Why Immediate Patching is Critical
Prevent Zero-Day Exploits: Attackers actively target unpatched Docker instances.
Compliance Risks: GDPR, HIPAA, and PCI-DSS require timely vulnerability fixes.
Business Continuity: A single exploit can disrupt CI/CD pipelines or cloud deployments.
FAQs: Docker Security Patches
Q: Can I mitigate these flaws without updating?
A: No—these require patching. Isolate affected containers if immediate updates aren’t possible.
Q: Does Kubernetes use these vulnerable Docker components?
A: Only if configured with Docker as the runtime. Consider switching to containerd for reduced attack surfaces.
Q: Are Windows/macOS Docker installations affected?
A: These CVEs primarily impact Linux hosts. Check Docker Desktop release notes for unrelated fixes.
Final Recommendations
Update Docker immediately using the commands above.
Audit container logs for unusual network activity.
Enforce runtime protections (AppArmor, seccomp) to limit exploit impact.
Need Expert Help?
Consult a DevSecOps specialist or use vulnerability scanning tools like Trivy or Clair for deeper inspections.
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