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CVE-2020-27864 : Exploit Details and Defense Strategies

Learn about CVE-2020-27864, a critical vulnerability in D-Link DAP-1860 WiFi extenders allowing attackers to execute arbitrary code. Find mitigation steps and patching details here.

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-1860 firmware version 1.04B03 WiFi extenders.

Understanding CVE-2020-27864

This CVE identifies a critical vulnerability in D-Link DAP-1860 WiFi extenders that can be exploited by attackers to run arbitrary code without authentication.

What is CVE-2020-27864?

The vulnerability in the HNAP service of D-Link DAP-1860 firmware version 1.04B03 allows attackers to execute code on the device without the need for authentication.

The Impact of CVE-2020-27864

        CVSS Base Score: 8.8 (High Severity)
        Attack Vector: Adjacent Network
        Confidentiality Impact: High
        Integrity Impact: High
        Availability Impact: High
        Privileges Required: None
        Scope: Unchanged
        This vulnerability poses a significant risk as it allows attackers to take full control of the affected device.

Technical Details of CVE-2020-27864

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw exists within the HNAP service of D-Link DAP-1860 firmware version 1.04B03, where user-supplied strings are not properly validated before executing system calls, enabling code execution by attackers.

Affected Systems and Versions

        Affected Product: D-Link DAP-1860
        Affected Version: Firmware version 1.04B03

Exploitation Mechanism

        Attackers exploit the vulnerability by sending malicious requests to the HNAP service on TCP port 80, allowing them to execute arbitrary code on the device.

Mitigation and Prevention

Protecting systems from CVE-2020-27864 requires immediate action and long-term security measures.

Immediate Steps to Take

        Update the firmware of D-Link DAP-1860 to the latest version.
        Monitor network traffic for any suspicious activity.

Long-Term Security Practices

        Implement network segmentation to limit the impact of potential attacks.
        Regularly audit and patch network devices to address security vulnerabilities.
        Educate users about phishing and social engineering tactics to prevent unauthorized access.

Patching and Updates

        D-Link has released patches to address this vulnerability. Ensure timely installation of these updates to secure the affected devices.

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