CVE-2020-9535 : What You Need to Know

A stack-based buffer overflow vulnerability was discovered in fmwlan.c on D-Link DIR-615Jx10 devices, allowing attackers to exploit the formWlanSetup_Wizard webpage parameter.

Understanding CVE-2020-9535

This CVE involves a critical buffer overflow issue on specific D-Link devices.

What is CVE-2020-9535?

The vulnerability in fmwlan.c on D-Link DIR-615Jx10 devices enables a stack-based buffer overflow through the formWlanSetup_Wizard webpage parameter, particularly when f_radius_ip1 is malformed.

The Impact of CVE-2020-9535

This vulnerability could be exploited by malicious actors to execute arbitrary code or crash the affected device, potentially leading to a denial of service (DoS) condition.

Technical Details of CVE-2020-9535

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The flaw in fmwlan.c on D-Link DIR-615Jx10 devices allows for a stack-based buffer overflow via the formWlanSetup_Wizard webpage parameter when f_radius_ip1 is improperly formatted.

Affected Systems and Versions

Product: D-Link DIR-615Jx10 devices
Vendor: D-Link
Versions: All versions are affected

Exploitation Mechanism

Attackers can trigger the buffer overflow by sending a specifically crafted request to the formWlanSetup_Wizard webpage with a malformed f_radius_ip1 parameter.

Mitigation and Prevention

Protecting systems from CVE-2020-9535 requires immediate action and long-term security measures.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to mitigate the vulnerability.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update and patch all software and firmware on network devices.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.
Educate users and administrators about safe browsing habits and security best practices.

Patching and Updates

Ensure that all D-Link DIR-615Jx10 devices are updated with the latest firmware releases provided by the vendor to address the buffer overflow vulnerability.