CVE-2018-21173 : Security Advisory and Response

A stack-based buffer overflow vulnerability has been identified in various NETGEAR devices, allowing exploitation by authenticated users.

Understanding CVE-2018-21173

What is CVE-2018-21173?

Certain NETGEAR devices are susceptible to a stack-based buffer overflow, impacting models such as R7500, R7800, R9000, WNDR3700v4, WNDR4300, WNDR4300v2, WNDR4500v3, and WNR2000v5.

The Impact of CVE-2018-21173

The vulnerability has a CVSS base score of 6.8, with high impacts on confidentiality, integrity, and availability. An attacker with high privileges can exploit this issue.

Technical Details of CVE-2018-21173

Vulnerability Description

The vulnerability allows authenticated users to trigger a stack-based buffer overflow on affected NETGEAR devices.

Affected Systems and Versions

R7500 (version prior to 1.0.0.122)
R7800 (version prior to 1.0.2.40)
R9000 (version prior to 1.0.2.52)
WNDR3700v4 (version prior to 1.0.2.92)
WNDR4300 (version prior to 1.0.2.94)
WNDR4300v2 (version prior to 1.0.0.50)
WNDR4500v3 (version prior to 1.0.0.50)
WNR2000v5 (version prior to 1.0.0.62)

Exploitation Mechanism

The vulnerability can be exploited by authenticated users to execute arbitrary code on the affected devices.

Mitigation and Prevention

Immediate Steps to Take

Update the firmware of the affected devices to the latest patched versions.
Restrict network access to vulnerable devices.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update and patch all network devices.
Implement strong authentication mechanisms.
Conduct regular security audits and assessments.

Patching and Updates

Apply the security patches provided by NETGEAR to address the stack-based buffer overflow vulnerability.