poprhythm 33868ee9bb falco: tune out gitea SSH and firefly-iii wait-for-it.sh stdio redirects
"Redirect STDOUT/STDIN to Network Connection in Container" (a reverse-shell
detector) was firing legitimately: gitea's sshd/sshd-session dup2 the
accepted SSH socket onto stdio for every session (4x per connection), and
firefly-iii's wait-for-it.sh does the same TCP-readiness-check dance while
waiting for postgres. Both confirmed recurring via netdata's alert history,
not one-off. Scoped exceptions added to each's specific binary/cmdline,
not the whole container/image.

Verified: a gitea SSH login no longer alerts, while a real dup2-based
redirect (bash's /dev/tcp exec pattern) from an unrelated container still
fires - the exception is narrow, not a blanket disable.

"Run shell untrusted" was also flagged as noisy, but investigation showed
it fired exactly once, during my own rule-testing window, and never
before or since - left alone rather than building a permanent exception
for a self-caused test artifact.
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2025-08-06 18:55:15 +00:00
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