CVE-2021-26810 : What You Need to Know

D-link DIR-816 A2 v1.10 is affected by a remote code injection vulnerability that can be exploited through an HTTP request parameter. This can allow attackers to inject and execute malicious commands via shell metacharacters.

Understanding CVE-2021-26810

This section will discuss the impact, technical details, and mitigation strategies related to CVE-2021-26810.

What is CVE-2021-26810?

CVE-2021-26810 refers to a remote code injection vulnerability in D-link DIR-816 A2 v1.10. Attackers can manipulate the statuscheckpppoeuser parameter to execute arbitrary commands on the affected system.

The Impact of CVE-2021-26810

The vulnerability poses a severe risk as threat actors can remotely execute unauthorized commands on the target system. This can lead to complete control over the device, data theft, or disruption of services.

Technical Details of CVE-2021-26810

Let's delve into the specifics of the vulnerability including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw resides in the handler function of /goform/dir_setWanWifi, where an HTTP request parameter is not properly sanitized. This allows an attacker to inject and execute commands using shell metacharacters.

Affected Systems and Versions

D-link DIR-816 A2 v1.10 is confirmed to be impacted by this vulnerability. Other versions or products may also be susceptible, although specific details are not provided.

Exploitation Mechanism

By crafting a malicious HTTP request with a specially-crafted statuscheckpppoeuser parameter, an attacker can insert shell metacharacters to execute arbitrary commands on the target device.

Mitigation and Prevention

Discover the immediate steps and long-term practices to safeguard systems against CVE-2021-26810.

Immediate Steps to Take

Users should apply security patches provided by D-link promptly. It is advisable to restrict network access to vulnerable devices and monitor for any suspicious activities.

Long-Term Security Practices

Incorporate robust network segmentation, strong access controls, and regular security assessments to fortify the overall security posture. Educating users about phishing and social engineering threats can also prevent successful exploits.

Patching and Updates

Stay informed about security advisories from D-link and promptly install firmware updates and security patches to eliminate the vulnerability.