CVE-2020-8863 : Security Advisory and Response
Learn about CVE-2020-8863, a high-severity vulnerability in D-Link routers allowing attackers to bypass authentication, escalate privileges, and execute code. Find mitigation steps and patching details.
A vulnerability in D-Link routers allows network-adjacent attackers to bypass authentication, potentially leading to privilege escalation and code execution.
Understanding CVE-2020-8863
This CVE involves a flaw in the authentication mechanism of certain D-Link routers, enabling attackers to exploit the issue without requiring authentication.
What is CVE-2020-8863?
This vulnerability permits network-adjacent attackers to bypass authentication on D-Link routers with firmware 1.10B04, including models DIR-867, DIR-878, and DIR-882. The flaw lies in the handling of HNAP login requests due to an incorrect implementation of the authentication algorithm.
The Impact of CVE-2020-8863
The vulnerability has a CVSS base score of 8.8, indicating a high severity level. Attackers can leverage this flaw to escalate privileges and execute code within the router's context, posing a significant risk to confidentiality, integrity, and availability.
Technical Details of CVE-2020-8863
This section provides detailed technical insights into the vulnerability.
Vulnerability Description
The vulnerability allows attackers to bypass authentication on affected D-Link routers by exploiting flaws in the handling of HNAP login requests due to an incorrect authentication algorithm implementation.
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
- Confidentiality, Integrity, and Availability Impact: High
Mitigation and Prevention
Protecting systems from CVE-2020-8863 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update affected D-Link routers to the latest firmware version.
- Monitor network traffic for any suspicious activities.
- Implement strong network segmentation to limit the attack surface.
Long-Term Security Practices
- Regularly review and update router configurations and access controls.
- Conduct security assessments and penetration testing to identify vulnerabilities.
- Educate users on secure password practices and the importance of firmware updates.
Patching and Updates
- Refer to D-Link's security advisory for specific patch details and instructions on securing the affected routers.