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Isaac Connor
093b24a530
GHSA-pxq8-5c8j-xf3r reports the event Name reaching a shell through
Event::GenerateVideo. That sink is already closed by "fix: run the event
video encoder without a shell" (GHSA-pfph-4j9j-7cv7), which runs ffmpeg as a
list. Reviewing the rest of the Perl video path turned up one more place an
event field reaches a shell: zmfilter's generateImage, used to attach frames
to filter emails and messages when no capture jpeg exists, built
ffmpeg -nostdin -ss <Delta> -i '<event path>/<DefaultVideo>' ...
and ran it with qx(). DefaultVideo is settable by an operator with
Events=Edit, so a single quote in it ends the quoted argument. The -r check
before it means the named file has to exist, but GenerateVideo itself will
create one whose name is the event Name, so the two fields together are
enough. Driving generateImage directly with DefaultVideo set to
"a';touch${IFS}<marker>;'.mp4" (and that file present) created the marker
before this change.
ffmpeg is now run through a list-form piped open, so there is no shell and
the path is one argument whatever it holds. stdout is still collected for the
debug log as qx() did; if ffmpeg cannot be started, status is reported as
127, as the shell did for a missing command. With the change the same input
passes the literal path to ffmpeg and creates no marker.
See GHSA-pxq8-5c8j-xf3r.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
(cherry picked from commit 0f700d30e8b5e67705243029b57005236ccbc3ff)