BrightSign Digital Signage Diagnostic Web Server 8.2.26 Unauthenticated SSRF Vendor: BrightSign, LLC Product web page: https://www.brightsign.biz Affected version: Model: XT, XD, HD, LS Firmware / OS version: <=8.2.26 Summary: BrightSign designs media players and provides free software and cloud networking solutions for the commercial digital signage market worldwide, serving all vertical segments of the marketplace. Desc: Unauthenticated Server-Side Request Forgery (SSRF) vulnerability exists in the BrightSign digital signage media player affecting the Diagnostic Web Server (DWS). The application parses user supplied data in the 'url' GET parameter to construct a diagnostics request to the Download Speed Test service. Since no validation is carried out on the parameter, an attacker can specify an external domain and force the application to make an HTTP request to an arbitrary destination host. This can be used by an external attacker for example to bypass firewalls and initiate a service and network enumeration on the internal network through the affected application. Tested on: roNodeJS Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2020-5595 Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5595.php 01.08.2020 -- PoC: # curl http://10.0.0.17/speedtest?url=127.0.0.1:22