CVE-2021-29294 : Exploit Details and Defense Strategies
Learn about CVE-2021-29294, a Null Pointer Dereference vulnerability in D-Link DSL-2740R UK_1.01 that could allow remote attackers to trigger a denial of service attack. Find out the impact, affected versions, and mitigation steps.
A Null Pointer Dereference vulnerability has been identified in D-Link DSL-2740R UK_1.01, which could allow a remote malicious user to cause a denial of service by exploiting the send_hnap_unauthorized function through a crafted POST request to /HNAP1. Please note that the issue affects an End of Life product and will not be patched.
Understanding CVE-2021-29294
This section will provide insights into the nature and impact of the CVE-2021-29294 vulnerability.
What is CVE-2021-29294?
The CVE-2021-29294 is a Null Pointer Dereference vulnerability found in D-Link DSL-2740R UK_1.01, allowing a malicious remote user to trigger a denial of service attack through a specific crafted request.
The Impact of CVE-2021-29294
The vulnerability could enable an attacker to disrupt the services of the affected device, potentially causing significant downtime and service unavailability.
Technical Details of CVE-2021-29294
In this section, the technical aspects of the CVE-2021-29294 vulnerability will be explored.
Vulnerability Description
The vulnerability arises due to a Null Pointer Dereference issue in the send_hnap_unauthorized function of D-Link DSL-2740R UK_1.01, which can be exploited through a crafted POST request to /HNAP1.
Affected Systems and Versions
This vulnerability affects D-Link DSL-2740R UK_1.01, with all hardware revisions considered End of Life, thereby leaving them susceptible to exploitation.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending a specifically crafted POST request to the /HNAP1 endpoint, leveraging the Null Pointer Dereference to cause a denial of service.
Mitigation and Prevention
This section will outline strategies to mitigate the risks associated with CVE-2021-29294.
Immediate Steps to Take
As a proactive measure, users are advised to discontinue the use of the affected D-Link DSL-2740R UK_1.01 device and consider upgrading to a supported and secure alternative.
Long-Term Security Practices
Implementing robust network security measures, such as regular security audits, access control policies, and intrusion detection systems, can help in fortifying the overall security posture.
Patching and Updates
Given that the affected product is End of Life and will not receive patches, it is crucial to transition to a supported and actively maintained device to ensure ongoing protection against potential vulnerabilities.