CVE-2021-31802 : Vulnerability Insights and Analysis

A heap-based Buffer Overflow vulnerability in NETGEAR R7000 1.0.11.116 devices allows attackers to execute code as root via a crafted HTTP request.

Understanding CVE-2021-31802

This CVE refers to a critical vulnerability in NETGEAR R7000 1.0.11.116 devices that enables an attacker to achieve code execution as root without authentication.

What is CVE-2021-31802?

NETGEAR R7000 1.0.11.116 is prone to a heap-based Buffer Overflow. An attacker can exploit this flaw locally via an HTTP request to execute malicious code with root privileges.

The Impact of CVE-2021-31802

The vulnerability allows threat actors to take complete control of affected devices, leading to potential data breaches, network compromise, and unauthorized access.

Technical Details of CVE-2021-31802

This section delves into the specifics of the vulnerability, including the affected systems, exploitation method, and preventive measures.

Vulnerability Description

The issue arises from a user-provided length value during a backup.cgi file upload, where the input is not properly validated, leading to a Buffer Overflow condition.

Affected Systems and Versions

NETGEAR R7000 1.0.11.116 devices are impacted by this vulnerability, leaving them susceptible to exploitation if not promptly addressed.

Exploitation Mechanism

Attackers can exploit this vulnerability by inserting a specific sequence before the Content-Length header in an HTTP request to trigger the Buffer Overflow.

Mitigation and Prevention

To safeguard against CVE-2021-31802, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Users should apply security patches provided by NETGEAR promptly, restrict network access to vulnerable devices, and monitor for any signs of unauthorized access.

Long-Term Security Practices

Regularly update firmware, implement network segmentation, use strong and unique passwords, and conduct security audits to fortify the overall security posture.