CVE-2020-15892 : Vulnerability Insights and Analysis

An issue was discovered in apply.cgi on D-Link DAP-1520 devices before 1.10b04Beta02, leading to a stack-based buffer overflow vulnerability.

Understanding CVE-2020-15892

This CVE describes a security flaw in D-Link DAP-1520 devices that allows attackers to trigger a buffer overflow by manipulating login request parameters.

What is CVE-2020-15892?

The vulnerability in apply.cgi on D-Link DAP-1520 devices allows attackers to bypass client-side validation on the password input field, leading to a stack-based buffer overflow.

The Impact of CVE-2020-15892

The exploitation of this vulnerability can result in unauthorized access to the device, potential data leakage, and the execution of arbitrary code by attackers.

Technical Details of CVE-2020-15892

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

The issue arises from the forwarding of request values to the ssi binary during a login action from the web interface.
Client-side validation on the password input field can be bypassed by manipulating the login request parameters.
Manipulating the vulnerable parameters can lead to a stack-based buffer overflow.
Other POST variables like html_response_page and log_user are also vulnerable.

Affected Systems and Versions

Devices: D-Link DAP-1520
Versions Affected: Before 1.10b04Beta02

Exploitation Mechanism

Attackers intercept the login request and tamper with parameters like log_pass to trigger the buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2020-15892 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the firmware to the latest version that includes a patch for the vulnerability.
Monitor network traffic for any suspicious activity.
Implement strong password policies and multi-factor authentication.

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.
Educate users on cybersecurity best practices to prevent social engineering attacks.

Patching and Updates

D-Link has released firmware updates addressing the vulnerability. Ensure all affected devices are updated to the patched versions.