Arbitrary host file read via symlinked CRI log path during containerd checkpoint restore
containerd's CRI plugin restores the container.log path from a checkpoint image during container restore without properly validating whether the restored path is a symlink. By supplying a crafted checkpoint image in which container.log resolves to a symlinked path, an attacker can cause the runtime to follow that link and expose the contents of an arbitrary file on the host through normal log retrieval mechanisms such as kubectl logs. The issue is specifically tied to checkpoint/restore handling in the CRI plugin.
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