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CVE-2020-10924 is a stack buffer overflow vulnerability in the UPnP daemon (upnpd) 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 validate the length of user-supplied data in the NewBlockSiteName XML tag before copying it to a fixed-length stack buffer. Attackers on the LAN can exploit this by sending a specially crafted POST request to the UPnP HTTP server on TCP port 5000, bypassing authentication via multiple SOAPAction headers and triggering the overflow. Successful exploitation allows arbitrary code execution as root, enabling full device compromise, including admin password reset and telnet root shell access.
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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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