poprhythm
9bf72f8e19
Written after the 2026-08-10/11 gitea internal-API log-poisoning attack that planted a malicious uploadpack.packObjectsHook backdoor. Catches both the planting (unexpected exec from a hooks/ path) and the firing (git-upload-pack/git-receive-pack spawning anything but its own pack-objects binary), independent of how the hook config got written.
30 lines
1.4 KiB
YAML
30 lines
1.4 KiB
YAML
# Custom rule: catch execution of any git hook file gitea didn't put there.
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# Added after the 2026-08-10/11 gitea internal-API log-poisoning attack, where
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# an attacker used /api/internal/manager/add-logger to write a malicious
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# uploadpack.packObjectsHook entry into the global .gitconfig, pointed at a
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# planted hooks/pre-applypatch.sample file under an unrelated repo. Gitea only
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# ever manages four hook names per repo (post-receive, pre-receive, update,
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# proc-receive), each delegating to a same-named script under hooks/*.d/gitea -
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# anything else executing from a hooks/ path is not something Gitea put there.
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- list: gitea_managed_hook_names
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items: [post-receive, pre-receive, update, proc-receive, gitea]
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- rule: Unexpected git hook execution
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desc: >
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A process executed from a path under a git repository's hooks/ directory
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whose name isn't one of Gitea's own managed hook scripts. Catches planted
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hooks used for persistence/RCE (e.g. a malicious uploadpack.packObjectsHook
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or receive hook), independent of how the file got written.
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condition: >
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spawned_process
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and container.name = "gitea"
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and proc.exepath contains "/hooks/"
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and not proc.name in (gitea_managed_hook_names)
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output: >
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Unexpected git hook executed
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(user=%user.name command=%proc.cmdline exepath=%proc.exepath
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parent=%proc.pname container=%container.name pid=%proc.pid)
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priority: CRITICAL
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tags: [git, persistence, mitre_persistence]
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