Who Contains the Containers?
Summary: Google Project Zero's James Forshaw researched Windows Server Containers and found four privilege escalations that Microsoft fixed in March 2021. The work followed Palo Alto Networks researcher Daniel Prizmant's discovery that global symbolic links could escape a server silo, an issue Microsoft declined to patch because it does not treat Windows Server Containers as a security boundary.
What's compelling: Microsoft's servicing criteria means silo escapes in Windows Server Containers draw no security bulletin, so a single kernel or silo flaw can take an attacker from a container to the host - and GKE was running Kubernetes on exactly this configuration while the issue remained unpatched.
Read the original at Google Project Zero ↗
- Topics
- Vulnerabilities & Patching
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