ZyXEL GS1900 Input Validation Error Vulnerability

ZyXEL GS1900 is a managed switch from ZyXEL Taiwan, China. A security vulnerability exists in the Zyxel GS1900 using firmware prior to version 2.50AAHH.0C0. The vulnerability can be exploited by an attacker to access the password recovery menu via the serial console...

CVE-2019-15801

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware,...

CVE-2019-15802

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in salutilstrencrypt in libsal.so.0.0. The parameters salt, IV, and key data are used to encrypt and decrypt all passwords using AES256...

CVE-2019-15804

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. 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...

CVE-2019-15800

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Due to lack of input validation in the cmdsystracerouteexec, cmdsysarpclear, and cmdsyspingexec functions in the libclicmd.so library contained in the firmware, an attacker could leverage these functions to call...

CVE-2019-15799

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH while their...

CVE-2019-15800

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Due to lack of input validation in the cmdsystracerouteexec, cmdsysarpclear, and cmdsyspingexec functions in the libclicmd.so library contained in the firmware, an attacker could leverage these functions to call...

CVE-2019-15803

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fdssyspassDebugPasswdret. The...

CVE-2019-15803

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fdssyspassDebugPasswdret. The...

CVE-2019-15804

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. 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...

CVE-2019-15799

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH while their...

CVE-2019-15801

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware,...

CVE-2019-15802

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in salutilstrencrypt in libsal.so.0.0. The parameters salt, IV, and key data are used to encrypt and decrypt all passwords using AES256...

Hardcoded credentials

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. The firmware hashes and encrypts passwords using a hardcoded cryptographic key in salutilstrencrypt in libsal.so.0.0. The parameters salt, IV, and key data are used to encrypt and decrypt all passwords using AES256...

Hardcoded credentials

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware,...

Improper access control

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fdssyspassDebugPasswdret. The...

Input validation

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. Due to lack of input validation in the cmdsystracerouteexec, cmdsysarpclear, and cmdsyspingexec functions in the libclicmd.so library contained in the firmware, an attacker could leverage these functions to call...

Memory corruption

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. 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...

Default credentials

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50AAHH.0C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH while their...

CVE-2019-15799

The CVE-2019-15799 issue affects Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Web-interface accounts with non-admin privileges can, when connected via SSH, obtain administrator-level access identical to their web permissions. This allows normal users to run the tech-support command i...