CVE-2021-27253 : Security Advisory and Response
Learn about CVE-2021-27253, a critical vulnerability in NETGEAR Nighthawk R7800 firmware version 1.0.2.76 allowing attackers to execute arbitrary code. Find out the impact, affected systems, and mitigation steps.
This CVE-2021-27253 article provides insights into a critical vulnerability found in NETGEAR Nighthawk R7800 firmware version 1.0.2.76, allowing attackers to execute arbitrary code.
Understanding CVE-2021-27253
This section will delve into the vulnerability's nature, impact, affected systems, and mitigation strategies.
What is CVE-2021-27253?
CVE-2021-27253 is a high-severity vulnerability in NETGEAR Nighthawk R7800. It enables network-adjacent attackers to run arbitrary code by exploiting the rc_service parameter in apply_bind.cgi.
The Impact of CVE-2021-27253
The vulnerability's impact is significant, with a CVSS base score of 8.8, indicating high confidentiality, integrity, and availability impacts. The flaw could be leveraged to execute code as root.
Technical Details of CVE-2021-27253
This section will provide a detailed overview of the vulnerability, including its description, affected systems, and exploitation mechanism.
Vulnerability Description
The vulnerability stems from the lack of proper validation of user-supplied input before utilizing it to execute system calls, leading to a heap-based buffer overflow (CWE-122).
Affected Systems and Versions
NETGEAR Nighthawk R7800 with firmware version 1.0.2.76 is affected by this vulnerability, putting these installations at risk of exploitation.
Exploitation Mechanism
Attackers can bypass the authentication mechanism to exploit the rc_service parameter in apply_bind.cgi, allowing the execution of arbitrary code in the context of root.
Mitigation and Prevention
This section outlines the necessary steps to mitigate the CVE-2021-27253 vulnerability and enhance overall system security.
Immediate Steps to Take
Users should update their NETGEAR Nighthawk R7800 firmware to a patched version to prevent exploitation of this vulnerability. Implement network security best practices.
Long-Term Security Practices
Regularly update firmware, conduct security assessments, monitor for unusual activities, and restrict network access to minimize the attack surface.
Patching and Updates
Stay informed about security advisories from NETGEAR and other relevant sources. Promptly apply patches and updates to address known vulnerabilities.