Follow-up to 419846c87 (GHSA-g66m-77fq-79v9). The Device path check was
applied to all monitor Types in three places, but the Device column is
only passed to a shell for Type='Local'. Non-Local monitors (Ffmpeg,
Remote, Libvlc, cURL, VNC) may legitimately hold legacy values such as
an RTSP URL in that column and should not be rejected or warned about.
- scripts/ZoneMinder/lib/ZoneMinder/Monitor.pm: control() dropped the
spurious Warning for non-Local monitors that was flooding zmwatch
logs. The Error/early-return path is preserved for Local.
- web/includes/actions/monitor.php: save action only runs
validDevicePath() when Type=='Local'.
- web/api/app/Model/Monitor.php: replaced the unconditional regex rule
with a validDevicePath() method that checks Type before enforcing
the /dev/ pattern.
Also add client-side validation matching the server rule, so Local
monitors get immediate feedback instead of a round-trip error:
- web/skins/classic/views/monitor.php: HTML5 pattern attribute on the
Device input. Escaped for the v-flag regex engine used by pattern=.
- web/skins/classic/views/js/monitor.js.php: validateForm() now also
rejects Device values that don't match the /dev/ pattern.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
The Device field from the Monitors table was interpolated directly into
shell commands (qx(), backticks, exec()) without sanitization, allowing
authenticated users with monitor-edit permissions to execute arbitrary
commands as www-data via the Device Path field.
Defense in depth:
- Input validation: reject Device values not matching /^\/dev\/[\w\/.\-]+$/
at save time in both web UI and REST API
- Output sanitization: use escapeshellarg() in PHP and quote validated
values in Perl at every shell execution point
Affected locations:
- scripts/ZoneMinder/lib/ZoneMinder/Monitor.pm (control, zmcControl)
- scripts/zmpkg.pl.in (system startup)
- web/includes/Monitor.php (zmcControl)
- web/includes/functions.php (zmcStatus, zmcCheck, validDevicePath)
- web/includes/actions/monitor.php (save action)
- web/api/app/Model/Monitor.php (daemonControl, validation rules)
- web/api/app/Controller/MonitorsController.php (daemonStatus)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
