CVE-2018-3955

Severity Score

7.2

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An exploitable operating system command injection exists in the Linksys ESeries line of routers (Linksys E1200 Firmware Version 2.0.09 and Linksys E2500 Firmware Version 3.0.04). Specially crafted entries to network configuration information can cause execution of arbitrary system commands, resulting in full control of the device. An attacker can send an authenticated HTTP request to trigger this vulnerability. Data entered into the 'Domain Name' input field through the web portal is submitted to apply.cgi as the value to the 'wan_domain' POST parameter. The wan_domain data goes through the nvram_set process described above. When the 'preinit' binary receives the SIGHUP signal it enters a code path that calls a function named 'set_host_domain_name' from its libshared.so shared object.

Existe una inyección de comandos del sistema operativo explotable en la línea de routers Linksys ESeries (Linksys E1200 con versión del firmware 2.0.09 y Linksys E2500 con versión del firmware 3.0.04). Las entradas especialmente manipuladas en la información de configuración de red pueden provocar la ejecución de comandos arbitrarios del sistema, lo que resulta en el control total del dispositivo. Un atacante puede enviar una petición HTTP autenticada para provocar esta vulnerabilidad. Los datos introducidos en el campo de entrada "Domain Name" mediante el portal web se envían a apply.cgi como el valor del parámetro POST "wan_domain". Los datos de wan_domain pasan por el proceso nvram_set descrito anteriormente. Cuando el binario "preinit" recibe la señal SIGHUP, introduce una ruta de código que llama a una función denominada "set_host_domain_name" desde su objeto compartido en libshared.so.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-01-02 CVE Reserved
2018-10-17 CVE Published
2024-07-31 EPSS Updated
2024-09-16 CVE Updated
2024-09-16 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625	2024-09-16

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
Linksys Search vendor "Linksys"	E1200 Firmware Search vendor "Linksys" for product "E1200 Firmware"	2.0.09 Search vendor "Linksys" for product "E1200 Firmware" and version "2.0.09"	-	Affected	in	Linksys Search vendor "Linksys"	E1200 Search vendor "Linksys" for product "E1200"	-	-	Safe
Linksys Search vendor "Linksys"	E2500 Firmware Search vendor "Linksys" for product "E2500 Firmware"	3.0.04 Search vendor "Linksys" for product "E2500 Firmware" and version "3.0.04"	-	Affected	in	Linksys Search vendor "Linksys"	E2500 Search vendor "Linksys" for product "E2500"	-	-	Safe