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CVE-2021-31802

Status Candidate

Overview

NETGEAR R7000 1.0.11.116 devices have a heap-based Buffer Overflow that is exploitable from the local network without authentication. The vulnerability exists within the handling of an HTTP request. An attacker can leverage this to execute code as root. The problem is that a user-provided length value is trusted during a backup.cgi file upload. The attacker must add a \n before the Content-Length header.

Related Files

Netgear R7000 Backup.cgi Heap Overflow Remote Code Execution
Posted Aug 31, 2024
Authored by Grant Willcox, colorlight2019, SSD Disclosure | Site metasploit.com

This Metasploit module exploits a heap buffer overflow in the genie.cgi?backup.cgi page of Netgear R7000 routers running firmware version 1.0.11.116. Successful exploitation results in unauthenticated attackers gaining code execution as the root user. The exploit utilizes these privileges to enable the telnet server which allows attackers to connect to the target and execute commands as the admin user from within a BusyBox shell. Users can connect to this telnet server by running the command "telnet *target IP*".

tags | exploit, overflow, shell, cgi, root, code execution
advisories | CVE-2021-31802
SHA-256 | 042eaa7026a5227a1b186fee630ffdae53cf707f495f6cf7879c9d6f44e1ac01
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