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CVE-2020-10923 is a stack buffer overflow vulnerability in the upnpd daemon of NETGEAR R6700 routers (firmware V1.0.4.82_10.0.57 and V1.0.4.84_10.0.58). The flaw resides in the sa_setBlockName() function, which fails to properly check the length of input parsed from the NewBlockSiteName XML tag in a POST request to the UPnP HTTP server on TCP port 5000. Authentication can be bypassed by sending multiple SOAPAction headers, exploiting poor parsing logic. Successful exploitation allows an unauthenticated LAN attacker to reset the router's admin password and enable a root telnet shell, leading to full device compromise. The vulnerability was publicly disclosed after NETGEAR failed to patch it, and a Metasploit module is available for exploitation.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit auxiliary module targeting Netgear R6700v3 routers (firmware V1.0.0.4.82_10.0.57 and V1.0.0.4.84_10.0.58) vulnerable to CVE-2020-10923 (authentication bypass) and CVE-2020-10924 (buffer overflow in upnpd). The exploit works by sending a specially crafted SOAP/XML payload via HTTP POST to the /soap/server_sa endpoint on port 5000, exploiting the buffer overflow to reset the 'admin' password to its factory default ('password'). This allows an attacker with LAN access to subsequently enable telnet and obtain a root shell using additional Metasploit modules. The exploit is operational, but not fully weaponized, as it requires manual steps to achieve full code execution. The module will crash the upnpd service, so it can only be used once per router reboot. The code is written in Ruby and is structured as a standard Metasploit module.
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