CVE-2019-9949

Severity Score

8.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Western Digital My Cloud Cloud, Mirror Gen2, EX2 Ultra, EX2100, EX4100, DL2100, DL4100, PR2100 and PR4100 before firmware 2.31.183 are affected by a code execution (as root, starting from a low-privilege user session) vulnerability. The cgi-bin/webfile_mgr.cgi file allows arbitrary file write by abusing symlinks. Specifically, this occurs by uploading a tar archive that contains a symbolic link, then uploading another archive that writes a file to the link using the "cgi_untar" command. Other commands might also be susceptible. Code can be executed because the "name" parameter passed to the cgi_unzip command is not sanitized.

Western Digital My Cloud Cloud, Mirror Gen2, EX2 Ultra, EX2100, EX4100, DL2100, DL4100, PR2100 y PR4100 antes del firmware versión 2.31.183 se ven afectados por una ejecución de código (as root, starting from a low-privilege user session). El archivo cgi-bin/webfile_mgr.cgi permite la escritura arbitraria de archivos al abusar de los symlinks. Específicamente, esto ocurre al cargar un archivo "tar" que contiene un enlace simbólico, y después cargar otro archivo que escribe un archivo en el enlace usando el comando "cgi_untar". Otros comandos también pueden ser susceptibles. El código puede ser ejecutado porque el parámetro "nombre" pasó hacia el comando cgi_unzip sin estar saneado.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

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

2019-03-23 CVE Reserved
2019-05-23 CVE Published
2024-05-16 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

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

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://bnbdr.github.io/posts/wd	2024-08-04
https://github.com/bnbdr/wd-rce	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717	2019-05-29

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Westerndigital Search vendor "Westerndigital"	My Cloud Firmware Search vendor "Westerndigital" for product "My Cloud Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Search vendor "Westerndigital" for product "My Cloud"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Mirror Gen2 Firmware Search vendor "Westerndigital" for product "My Cloud Mirror Gen2 Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Mirror Gen2 Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Mirror Gen2 Search vendor "Westerndigital" for product "My Cloud Mirror Gen2"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Ex2 Ultra Firmware Search vendor "Westerndigital" for product "My Cloud Ex2 Ultra Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Ex2 Ultra Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Ex2 Ultra Search vendor "Westerndigital" for product "My Cloud Ex2 Ultra"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Ex2100 Firmware Search vendor "Westerndigital" for product "My Cloud Ex2100 Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Ex2100 Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Ex2100 Search vendor "Westerndigital" for product "My Cloud Ex2100"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Ex4100 Firmware Search vendor "Westerndigital" for product "My Cloud Ex4100 Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Ex4100 Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Ex4100 Search vendor "Westerndigital" for product "My Cloud Ex4100"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Dl2100 Firmware Search vendor "Westerndigital" for product "My Cloud Dl2100 Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Dl2100 Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Dl2100 Search vendor "Westerndigital" for product "My Cloud Dl2100"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Dl4100 Firmware Search vendor "Westerndigital" for product "My Cloud Dl4100 Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Dl4100 Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Dl4100 Search vendor "Westerndigital" for product "My Cloud Dl4100"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Pr2100 Firmware Search vendor "Westerndigital" for product "My Cloud Pr2100 Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Pr2100 Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Pr2100 Search vendor "Westerndigital" for product "My Cloud Pr2100"	-	-	Safe
Westerndigital Search vendor "Westerndigital"	My Cloud Pr4100 Firmware Search vendor "Westerndigital" for product "My Cloud Pr4100 Firmware"	< 2.31.183 Search vendor "Westerndigital" for product "My Cloud Pr4100 Firmware" and version " < 2.31.183"	-	Affected	in	Westerndigital Search vendor "Westerndigital"	My Cloud Pr4100 Search vendor "Westerndigital" for product "My Cloud Pr4100"	-	-	Safe