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Container Escape
2 posts
Nimbus — SSRF to IMDS Credential Theft, YAML Deserialization RCE, and Privileged Container Escape via core_pattern
An SSRF on a job scheduler leaks AWS IAM credentials from the instance metadata service. The stolen credentials give access to an SQS queue consumed by a worker doing unsafe YAML deserialization — yielding RCE inside a container. From there, a privileged CodeBuild container built with LocalStack is used to overwrite kernel's core_pattern and escape to root on the host.
HTB MonitorsFour: IDOR to RCE to Docker Escape
An unauthenticated IDOR on an internal API leaks user credentials. Cracking an MD5 hash grants access to a Cacti instance vulnerable to CVE-2025-24367 (authenticated RCE). From a www-data shell inside a Docker container, an exposed Docker Engine API (port 2375) enables container escape and host compromise.