CVE-2021-27246

TP-Link AC1750 sync-server Stack-based Buffer Overflow Remote Code Execution Vulnerability

Severity Score

8.0

*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 execute arbitrary code on affected installations of TP-Link Archer A7 AC1750 1.0.15 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of MAC addresses by the tdpServer endpoint. A crafted TCP message can write stack pointers to the stack. An attacker can leverage this vulnerability to execute code in the context of the root user. Was ZDI-CAN-12306.

Esta vulnerabilidad permite a atacantes adyacentes a la red ejecutar código arbitrario en las instalaciones afectadas de los enrutadores TP-Link Archer A7 AC1750 versión 1.0.15. No es requerida una autenticación para explotar esta vulnerabilidad. El fallo específico se presenta dentro del manejo de direcciones MAC por parte del endpoint tdpServer. Un mensaje TCP diseñado puede escribir punteros stack en la pila. Un atacante puede aprovechar esta vulnerabilidad para ejecutar código en el contexto del usuario root. Era ZDI-CAN-12306

This vulnerability allows network-adjacent 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 MAC addresses by the tdpServer endpoint. A crafted TCP message can write stack pointers to the stack. An attacker can leverage this vulnerability to execute code in the context of the root user.

*Credits: @0xMitsurugi (Synacktiv), @swapgs (Synacktiv)

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Adjacent

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-02-16 CVE Reserved
2021-02-24 CVE Published
2024-05-01 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-121: Stack-based Buffer Overflow

CAPEC

References (1)

URL	Tag	Source
https://www.zerodayinitiative.com/advisories/ZDI-21-215	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"	1.0.15 Search vendor "Tp-link" for product "Ac1750 Firmware" and version "1.0.15"	-	Affected	in	Tp-link Search vendor "Tp-link"	Ac1750 Search vendor "Tp-link" for product "Ac1750"	a7 Search vendor "Tp-link" for product "Ac1750" and version "a7"	-	Safe