CVE-2021-27114 : Exploit Details and Defense Strategies

A Stack-Based Buffer Overflow vulnerability was found in D-Link DIR-816 A2 1.10 B05 devices, specifically within the handler function of the /goform/addassignment route. This could allow an attacker to trigger the vulnerability by submitting a very long text to certain fields, leading to potentially malicious consequences.

Understanding CVE-2021-27114

This section provides insights into the nature of the vulnerability and its potential impact.

What is CVE-2021-27114?

CVE-2021-27114 is a security flaw identified in D-Link DIR-816 A2 1.10 B05 devices, where an attacker could exploit a Stack-Based Buffer Overflow by submitting an excessively long text to specific fields. This overflow may then enable unauthorized activities and jeopardize system stability.

The Impact of CVE-2021-27114

The exploitation of this vulnerability could result in a Stack-Based Buffer Overflow, compromising the integrity of the affected devices and potentially leading to arbitrary code execution or a system crash. Such unauthorized access can pose significant security risks to both individuals and organizations.

Technical Details of CVE-2021-27114

Explore in-depth technical information about the vulnerability.

Vulnerability Description

The vulnerability arises within the /goform/addassignment route handler function of D-Link DIR-816 A2 1.10 B05 devices. By injecting an excessively long text into certain fields like "s_ip" and "s_mac", an attacker can trigger a Stack-Based Buffer Overflow, potentially altering the return address and facilitating malicious activities.

Affected Systems and Versions

The Stack-Based Buffer Overflow vulnerability affects D-Link DIR-816 A2 1.10 B05 devices running the specific firmware version. Users of these devices should be vigilant and take necessary precautions to prevent exploitation.

Exploitation Mechanism

Exploiting CVE-2021-27114 involves crafting and submitting exceptionally long text entries to vulnerable fields, thereby causing a Stack-Based Buffer Overflow. This can be leveraged by threat actors to execute arbitrary code or disrupt system operations.

Mitigation and Prevention

Discover the steps to mitigate the risks associated with CVE-2021-27114.

Immediate Steps to Take

It is crucial for users of D-Link DIR-816 A2 1.10 B05 devices to apply security patches provided by the vendor promptly. Additionally, limiting access to vulnerable routes and implementing firewall rules can help reduce the likelihood of exploitation.

Long-Term Security Practices

In the long term, users should stay informed about security updates released by D-Link and other relevant authorities. Employing network segmentation, access controls, and regular security audits can enhance the overall security posture against potential threats.

Patching and Updates

Regularly check for firmware updates and security advisories from D-Link to ensure that your devices are protected against known vulnerabilities. Timely patching is essential to address security gaps and maintain a secure environment.