CVE-2021-20153

Severity Score

6.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Trendnet AC2600 TEW-827DRU version 2.08B01 contains a symlink vulnerability in the bittorrent functionality. If enabled, the bittorrent functionality is vulnerable to a symlink attack that could lead to remote code execution on the device. If an end user inserts a flash drive with a malicious symlink on it that the bittorrent client can write downloads to, then a user is able to download arbitrary files to any desired location on the devices filesystem, which could lead to remote code execution. Example directories vulnerable to this include "config", "downloads", and "torrents", though it should be noted that "downloads" is the only vector that allows for arbitrary files to be downloaded to arbitrary locations.

Trendnet AC2600 TEW-827DRU versión 2.08B01, contiene una vulnerabilidad de symlink en la funcionalidad bittorrent. Si está habilitada, la funcionalidad de bittorrent es vulnerable a un ataque de enlace simbólico que podría conllevar a una ejecución de código remota en el dispositivo. Si un usuario final inserta una unidad flash con un enlace simbólico malicioso en el que el cliente bittorrent puede escribir descargas, entonces un usuario es capaz de descargar archivos arbitrarios en cualquier ubicación deseada en el sistema de archivos del dispositivo, lo que podría conllevar a una ejecución de código remota. Ejemplos de directorios vulnerables a esto incluyen "config", "downloads", y "torrents", aunque debe notarse que "downloads" es el único vector que permite la descarga de archivos arbitrarios a ubicaciones arbitrarias.

*Credits: N/A

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

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

2020-12-17 CVE Reserved
2021-12-30 CVE Published
2024-08-03 CVE Updated
2024-09-14 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-59: Improper Link Resolution Before File Access ('Link Following')

CAPEC

References (1)

URL	Tag	Source
https://www.tenable.com/security/research/tra-2021-54	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
Trendnet Search vendor "Trendnet"	Tew-827dru Firmware Search vendor "Trendnet" for product "Tew-827dru Firmware"	2.08b01 Search vendor "Trendnet" for product "Tew-827dru Firmware" and version "2.08b01"	-	Affected	in	Trendnet Search vendor "Trendnet"	Tew-827dru Search vendor "Trendnet" for product "Tew-827dru"	2.0 Search vendor "Trendnet" for product "Tew-827dru" and version "2.0"	-	Safe