// For flags

CVE-2020-10885

TP-Link Archer A7 DNS Response Improper Input Validation Remote Code Execution Vulnerability

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-Link Archer A7 Firmware Ver: 190726 AC1750 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of DNS responses. The issue results from the lack of proper validation of DNS reponses prior to further processing. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the root user. Was ZDI-CAN-9661.

Esta vulnerabilidad permite a atacantes remotos ejecutar código arbitrario sobre las instalaciones afectadas de enrutadores AC1750 TP-Link Archer A7 Versión de Firmware: 190726. No es requerida una autenticación para explotar esta vulnerabilidad. El fallo específico se presenta en el manejo de las respuestas DNS. El problema resulta de la falta de una comprobación apropiada de las respuestas de DNS antes del procesamiento posterior. Un atacante puede aprovechar esto conjunto con otras vulnerabilidades para ejecutar código en el contexto del usuario root. Fue ZDI-CAN-9661.

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-Link Archer A7 AC1750 routers. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the handling of DNS responses. The issue results from the lack of proper validation of DNS reponses prior to further processing. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the root user.

*Credits: Pedro Ribeiro and Radek Domanski of Team Flashback
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-03-24 CVE Reserved
  • 2020-03-25 CVE Published
  • 2024-08-04 CVE Updated
  • 2024-09-21 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
CAPEC
References (1)
URL Tag Source
https://www.zerodayinitiative.com/advisories/ZDI-20-337 Third Party Advisory
URL Date SRC
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Tp-link
Search vendor "Tp-link"
 Ac1750 Firmware
Search vendor "Tp-link" for product "Ac1750 Firmware"
 190726
Search vendor "Tp-link" for product "Ac1750 Firmware" and version "190726"
-
Affected
in Tp-link
Search vendor "Tp-link"
 Ac1750
Search vendor "Tp-link" for product "Ac1750"
--
Safe