CVE-2019-15802

Severity Score

5.9

*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. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in sal_util_str_encrypt() in libsal.so.0.0. The parameters (salt, IV, and key data) are used to encrypt and decrypt all passwords using AES256 in CBC mode. With the parameters known, all previously encrypted passwords can be decrypted. This includes the passwords that are part of configuration backups or otherwise embedded as part of the firmware.

Se descubrió un problema en los dispositivos Zyxel GS1900 con firmware anterior a la versión 2.50 (AAHH.0) C0. El firmware codifica y cifra las contraseñas con una clave criptográfica codificada en sal_util_str_encrypt () en libsal.so.0.0. Los parámetros (sal, IV y datos clave) se utilizan para cifrar y descifrar todas las contraseñas utilizando AES256 en modo CBC. Con los parámetros conocidos, se pueden descifrar todas las contraseñas previamente encriptadas. Esto incluye las contraseñas que forman parte de las copias de seguridad de la configuración o que están integradas como parte del firmware.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

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
2023-03-19 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-798: Use of Hard-coded Credentials

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	2019-11-22

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