CVE-2020-8864

D-Link Multiple Routers HNAP strncmp Incorrect Comparison Authentication Bypass Vulnerability

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.10B04. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of HNAP login requests. The issue results from the lack of proper handling of empty passwords. An attacker can leverage this vulnerability to execute arbitrary code on the router. Was ZDI-CAN-9471.

Esta vulnerabilidad permite a atacantes adyacentes a la red omitir la autenticación sobre las instalaciones afectadas de los enrutadores D-Link DIR-867, DIR-878 y DIR-882 con versión de firmware 1.10B04. No es requerida una autenticación para explotar esta vulnerabilidad. El fallo específico se presenta en el manejo de las peticiones de inicio de sesión de HNAP. El problema es debido a la falta de un manejo adecuado de las contraseñas vacías. Un atacante puede aprovechar esta vulnerabilidad para ejecutar código arbitrario en el enrutador. Fue ZDI-CAN-9471.

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of HNAP login requests. The issue results from the lack of proper handling of empty passwords. An attacker can leverage this vulnerability to execute arbitrary code on the router.

*Credits: chung96vn - Security Researcher of VinCSS (Member of Vingroup)

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-02-11 CVE Reserved
2020-02-24 CVE Published
2023-03-07 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-697: Incorrect Comparison

CAPEC

References (2)

URL	Tag	Source
https://www.zerodayinitiative.com/advisories/ZDI-20-268	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10157	2021-04-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Dlink Search vendor "Dlink"	Dir-878 Firmware Search vendor "Dlink" for product "Dir-878 Firmware"	<= 1.20b03 Search vendor "Dlink" for product "Dir-878 Firmware" and version " <= 1.20b03"	-	Affected	in	Dlink Search vendor "Dlink"	Dir-878 Search vendor "Dlink" for product "Dir-878"	-	-	Safe
Dlink Search vendor "Dlink"	Dir-882 Firmware Search vendor "Dlink" for product "Dir-882 Firmware"	<= 1.10b04 Search vendor "Dlink" for product "Dir-882 Firmware" and version " <= 1.10b04"	-	Affected	in	Dlink Search vendor "Dlink"	Dir-882 Search vendor "Dlink" for product "Dir-882"	-	-	Safe
Dlink Search vendor "Dlink"	Dir-867 Firmware Search vendor "Dlink" for product "Dir-867 Firmware"	<= 1.10b04 Search vendor "Dlink" for product "Dir-867 Firmware" and version " <= 1.10b04"	-	Affected	in	Dlink Search vendor "Dlink"	Dir-867 Search vendor "Dlink" for product "Dir-867"	-	-	Safe