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Potential Container Escape via Kernel core_pattern Modification

The Linux kernel invokes the program named in "/proc/sys/kernel/core_pattern" whenever a process core-dumps. When that value begins with a pipe (|), the kernel runs the handler from the host's initial namespace as…

Description

The Linux kernel invokes the program named in "/proc/sys/kernel/core_pattern" whenever a process core-dumps. When that value begins with a pipe (|), the kernel runs the handler from the host's initial namespace as root, regardless of where the crashing process lived. Because the core-dump up-call is not namespaced, a process inside a container that can write core_pattern can register an attacker-controlled handler and then deliberately crash a process to have it execute on the host as root, resulting in a full container-to-host escape.

Detection logic

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Detection requirements

Platform
ContainersESXiLinuxWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
event_index

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