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Added rule to detect CVE-2019-5736 #2188

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merged 2 commits into from
Sep 16, 2022
Merged

Added rule to detect CVE-2019-5736 #2188

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2edbd05
Added rule to detect CVE-2019-5736
darryk10 Sep 2, 2022
69e8f6c
Added disable by default option to reduce noise
darryk10 Sep 2, 2022
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16 changes: 16 additions & 0 deletions rules/falco_rules.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -3199,6 +3199,22 @@
priority: CRITICAL
tags: [mitre_initial_access]

- list: docker_binaries
items: [dockerd, containerd-shim, "runc:[1:CHILD]", pause]

- macro: docker_procs
condition: proc.name in (docker_binaries)

- rule: Modify Container Entrypoint
desc: This rule detect an attempt to write on container entrypoint symlink (/proc/self/exe). Possible CVE-2019-5736 Container Breakout exploitation attempt.
condition: >
open_write and container and (fd.name=/proc/self/exe or fd.name startswith /proc/self/fd/) and not docker_procs and not proc.cmdline = "runc:[1:CHILD] init"
enabled: false
output: >
Detect Potential Container Breakout Exploit (CVE-2019-5736) (user=%user.name process=%proc.name file=%fd.name cmdline=%proc.cmdline %container.info)
priority: WARNING
tags: [container, filesystem, mitre_initial_access]

# Application rules have moved to application_rules.yaml. Please look
# there if you want to enable them by adding to
# falco_rules.local.yaml.