CVE-2021-34862 : Vulnerability Insights and Analysis
Learn about CVE-2021-34862, a high-severity vulnerability in D-Link DAP-2020 1.01rc001 routers allowing attackers to execute arbitrary code without authentication. Find out how to mitigate the risk.
This CVE-2021-34862 article provides insights into a vulnerability in D-Link DAP-2020 1.01rc001 routers that allows network-adjacent attackers to execute arbitrary code without authentication.
Understanding CVE-2021-34862
This section delves into the details of CVE-2021-34862.
What is CVE-2021-34862?
CVE-2021-34862 is a vulnerability that enables network-adjacent attackers to run arbitrary code on affected D-Link DAP-2020 1.01rc001 routers without needing authentication. The flaw is due to improper validation of user-supplied data length, leading to a stack-based buffer overflow.
The Impact of CVE-2021-34862
The impact of this vulnerability is rated high with a CVSS base score of 8.8. Attackers can exploit it to execute code in the context of root, jeopardizing confidentiality, integrity, and availability.
Technical Details of CVE-2021-34862
This section presents the technical aspects of CVE-2021-34862.
Vulnerability Description
The vulnerability arises from the mishandling of the var:menu parameter in the webproc endpoint, allowing attackers to execute arbitrary code as root.
Affected Systems and Versions
D-Link DAP-2020 routers running version 1.01rc001 are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit the lack of data validation in the var:menu parameter to trigger a stack-based buffer overflow and execute malicious code.
Mitigation and Prevention
Here, we discuss measures to mitigate and prevent exploitation of CVE-2021-34862.
Immediate Steps to Take
Users should apply security patches provided by D-Link promptly to mitigate the risk of exploitation. Network segmentation can also limit exposure to adjacent attackers.
Long-Term Security Practices
Implementing strong firewall rules, intrusion detection systems, and regular security audits can enhance long-term security posture.
Patching and Updates
Regularly check for firmware updates and security advisories from D-Link to stay protected against emerging threats.