CVE-2020-8864 : Exploit Details and Defense Strategies

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link routers with firmware 1.10B04, potentially leading to arbitrary code execution.

Understanding CVE-2020-8864

This CVE identifies a critical security flaw in D-Link routers that could be exploited by attackers without the need for authentication.

What is CVE-2020-8864?

The vulnerability in D-Link routers allows network-adjacent attackers to bypass authentication, specifically affecting models DIR-867, DIR-878, and DIR-882 with firmware 1.10B04. The issue arises from improper handling of HNAP login requests, enabling the execution of arbitrary code on the router.

The Impact of CVE-2020-8864

The impact of this vulnerability is rated as high, with a CVSS base score of 8.8. It poses a significant risk to confidentiality, integrity, and availability of the affected systems.

Technical Details of CVE-2020-8864

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability stems from the inadequate handling of empty passwords in HNAP login requests, allowing attackers to execute arbitrary code on the router.

Affected Systems and Versions

Product: Multiple Routers
Vendor: D-Link
Versions Affected: 1.10B04

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Adjacent Network
Privileges Required: None
User Interaction: None
Scope: Unchanged
Vector String: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and Prevention

To address CVE-2020-8864, follow these mitigation strategies:

Immediate Steps to Take

Update the firmware of D-Link routers to the latest version.
Implement strong, unique passwords for router access.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly check for firmware updates and apply them promptly.
Conduct security audits to identify and address vulnerabilities proactively.

Patching and Updates

Stay informed about security advisories from D-Link and apply patches as soon as they are released.