CVE-2019-15804

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. By sending a signal to the CLI process, undocumented functionality is triggered. Specifically, a menu can be triggered by sending the SIGQUIT signal to the CLI application (e.g., through CTRL+\ via SSH). The access control check for this menu does work and prohibits accessing the menu, which contains "Password recovery for specific user" options. The menu is believed to be accessible using a serial console.

Se descubrió un problema en los dispositivos Zyxel GS1900 con firmware anterior a 2.50(AAHH.0)C0. Mediante el envió de una señal al proceso de la CLI, una funcionalidad no documentada es activada. Específicamente, se puede activar un menú mediante el envío de la señal SIGQUIT a la aplicación de la CLI (por ejemplo, por medio de CTRL+\ vía SSH). La comprobación del control de acceso para este menú opera y prohíbe acceder al menú, que contiene las opciones de "Password recovery for specific user". Se cree que es posible acceder al menú usando una consola en serie.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-08-29 CVE Reserved
2019-11-14 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html	2024-08-05

URL	Date	SRC

URL	Date	SRC
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml	2020-08-24

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zyxel Search vendor "Zyxel"	Gs1900-8 Firmware Search vendor "Zyxel" for product "Gs1900-8 Firmware"	< 2.50\(aahh.0\)c0 Search vendor "Zyxel" for product "Gs1900-8 Firmware" and version " < 2.50\(aahh.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-8 Search vendor "Zyxel" for product "Gs1900-8"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-8hp Firmware Search vendor "Zyxel" for product "Gs1900-8hp Firmware"	< 2.50\(aahi.0\)c0 Search vendor "Zyxel" for product "Gs1900-8hp Firmware" and version " < 2.50\(aahi.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-8hp Search vendor "Zyxel" for product "Gs1900-8hp"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-10hp Firmware Search vendor "Zyxel" for product "Gs1900-10hp Firmware"	< 2.50\(aazi.0\)c0 Search vendor "Zyxel" for product "Gs1900-10hp Firmware" and version " < 2.50\(aazi.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-10hp Search vendor "Zyxel" for product "Gs1900-10hp"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-16 Firmware Search vendor "Zyxel" for product "Gs1900-16 Firmware"	< 2.50\(aahj.0\)c0 Search vendor "Zyxel" for product "Gs1900-16 Firmware" and version " < 2.50\(aahj.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-16 Search vendor "Zyxel" for product "Gs1900-16"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24e Firmware Search vendor "Zyxel" for product "Gs1900-24e Firmware"	< 2.50\(aahk.0\)c0 Search vendor "Zyxel" for product "Gs1900-24e Firmware" and version " < 2.50\(aahk.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24e Search vendor "Zyxel" for product "Gs1900-24e"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24 Firmware Search vendor "Zyxel" for product "Gs1900-24 Firmware"	< 2.50\(aahl.0\)c0 Search vendor "Zyxel" for product "Gs1900-24 Firmware" and version " < 2.50\(aahl.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24 Search vendor "Zyxel" for product "Gs1900-24"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-24hp Firmware Search vendor "Zyxel" for product "Gs1900-24hp Firmware"	< 2.50\(aahm.0\)c0 Search vendor "Zyxel" for product "Gs1900-24hp Firmware" and version " < 2.50\(aahm.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-24hp Search vendor "Zyxel" for product "Gs1900-24hp"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-48 Firmware Search vendor "Zyxel" for product "Gs1900-48 Firmware"	< 2.50\(aahn.0\)c0 Search vendor "Zyxel" for product "Gs1900-48 Firmware" and version " < 2.50\(aahn.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-48 Search vendor "Zyxel" for product "Gs1900-48"	-	-	Safe
Zyxel Search vendor "Zyxel"	Gs1900-48hp Firmware Search vendor "Zyxel" for product "Gs1900-48hp Firmware"	< 2.50\(aaho.0\)c0 Search vendor "Zyxel" for product "Gs1900-48hp Firmware" and version " < 2.50\(aaho.0\)c0"	-	Affected	in	Zyxel Search vendor "Zyxel"	Gs1900-48hp Search vendor "Zyxel" for product "Gs1900-48hp"	-	-	Safe