CVE-2021-27253 – NETGEAR Nighthawk R7800 Heap-based Buffer Overflow Remote Code Execution Vulnerability

https://notcve.org/view.php?id=CVE-2021-27253

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_bind.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. • https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders https://www.zerodayinitiative.com/advisories/ZDI-21-249 • CWE-122: Heap-based Buffer Overflow CWE-787: Out-of-bounds Write •