CVE-2021-43573 : Security Advisory and Response

A buffer overflow vulnerability was discovered on Realtek RTL8195AM devices, potentially allowing malicious actors to execute arbitrary code or trigger a denial of service attack.

Understanding CVE-2021-43573

What is CVE-2021-43573?

This CVE refers to a buffer overflow issue found in Realtek RTL8195AM devices before version 2.0.10, specifically in the client code handling malformed IE length of HT capability information in Beacon and Association response frames.

The Impact of CVE-2021-43573

The vulnerability could be exploited by attackers to execute arbitrary code or launch a denial of service attack on affected devices, compromising their integrity and availability.

Technical Details of CVE-2021-43573

Vulnerability Description

The buffer overflow occurs due to improper handling of malformed IE length in specific frames, leading to memory corruption and potentially allowing attackers to execute arbitrary code.

Affected Systems and Versions

Realtek RTL8195AM devices before version 2.0.10

Exploitation Mechanism

Attackers can craft malicious network packets with specially crafted IE length values to trigger the buffer overflow and potentially exploit the vulnerability.

Mitigation and Prevention

Immediate Steps to Take

Apply the latest firmware update provided by Realtek to patch the vulnerability.
Implement network segmentation to limit the exposure of vulnerable devices.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Realtek.
Conduct periodic security assessments and penetration testing to identify and address potential vulnerabilities.

Patching and Updates

Realtek has released version 2.0.10 as a patch addressing this vulnerability. Ensure all affected devices are updated to the latest version to mitigate the risk of exploitation.