or, how I found multiple vulnerabilities on a lazy Sunday afternoon Earlier this year the NSA released Ghidra, a reverse engineering suite with support for a large number of CPU/MCU instruction sets. It may be sensible to connect directly to the switch rather than via any intermediate devices. CVE-2019-15803: Hidden Functionality for the diagnostics shell via CTRL-ALT-t. CVE-2019-15804: Hidden Functionality for the password recovery menu via SIGQUIT. A thorough investigation has confirmed that GS1900 series switches are Zyxel’s only affected models. CVE: CVE-2019-15799; CVE-2019-15800; CVE-2019-15801; CVE-2019-15802; CVE-2019-15803; CVE-2019-15804. The instructions were tested on a GS1900-24 model running firmware version … The Zyxel GS1900 Series of 8/10/16/24/48-port GbE Smart Managed Switch with Gigabit speed bring your business network more flexibility and connectivity. This document describes how to install a custom RSA key and X.509 certificate on a Zyxel GS1900 series switch. GS1900 Series switch pdf manual download. Also, the user-friendly wizard helps to walk through setup, configuration and even advanced settings quickly. The instructions were tested on a GS1900-24 model running firmware version “V2.00(AAHL.2)”. The GS1900 is a series of switches with full non-blocking bandwidth of up to 1 Gbps per port. CVE-2019-15801: Contains fixed encrypted passwords for accessing debug and diagnostic functions. View and Download ZyXEL Communications GS1900 Series user manual online. Instead files have to be written using cat. This document describes how to install a custom RSA key and X.509 certificate on a Zyxel GS1900 series switch. CVE-2019-15800: Improper input validation related to the functions of libclicmd.so library. Thanks to the following researchers for reporting the issues to us: כל הזכויות שמורות. Please contact your local service rep for further information or assistance. documented how to enable the Telnet daemon, Select “enabled” for Telnet and apply the changes. An ideal upgrade from an unmanaged switch, it’s a great choice for SMBs that want to enjoy high-speed business network applications at full wired non-blocking speed. As usual a configuration backup should be made before starting. The management side of the Zyxel's GS1900 Ethernet switch series uses a Linux kernel in combination with a Busybox-based userland. GS1900 Series GbE Smart Managed Switch. The latest firmware addressing the vulnerabilities are listed in the table below, and we urge users to install them immediately. It is ideal for your office environment. There are only few programs available in the userland. The key and certificate should be generated on a separate machine as the version on the switch is very old. The smart fan is designed to automatically adjust speed based on device temperature. I'm reproducing the important steps: The author used a variation of the command shown below to generate a new RSA key with a length of 4096 bits and a self-signed certificate with a validity of one year. Optional: If desired the plaintext HTTP protocol can be disabled once HTTPS works. It's imperative to ensure everything works as desired before proceeding further. In case anything goes wrong and all configuration interfaces become unavailable the switch has to be restored to factory defaults. Zyxel has released firmware updates for recently discovered vulnerabilities of the GS1900 switches and urges users to install them immediately for optimal protection. While I have some experience with Hopper and radare2 I wanted to play with Ghidra to poke around the firmware for my Zyxel GS1900 … Naturally a certificate signed by a certificate authority (CA) may also be used. CVE-2019-15799: Incorrect access control for the full administrative level access via SSH for unprivileged users. There is no text editor at all. By default only a Web interface is enabled for administration. The Smart Managed GS1900 Series switch feature with web-based interface to manage advanced functions such as VLAN, QoS, IGMP Snooping, Link Aggregation (LAG), IPv6 and DoS prevention easily. *All specifications are subject to change without notice. Allows an SSH session to be established without authentication, which by extension allows tunnelling and use of the affected device as a proxy. HTTP over TLS (often called HTTPS) can be enabled, but neither the key nor the certificate can be configured via the web interface. Quality Bytes היא נציגתה הבלעדית של Zyxel בישראל. Also for: Gs1900-8, Gs1900-8hp, Gs1900-16, Gs1900 … If you’ve found a vulnerability, we want to work with you to fix it—contact security@zyxel.com.tw and we’ll get right back to you. That means a single switch can power more APs, IP cameras and VoIP phones, ensuring a better ROI for your business. Speedy Gigabit performance—built for SMBs, Zyxel security advisory for NAS remote access vulnerability, Zyxel security advisory for the Fraunhofer Home Router Security Report 2020, Zyxel security advisory for vulnerabilities of CloudCNM SecuManager, Zyxel security advisory for the remote code execution vulnerability of NAS and firewall products, Safety, Health, Environment and Energy Policy. Zyxel GS1900 series switches running firmware version 2.40 and earlier have the following vulnerabilities: CVE-2019-15799: Incorrect access control for the full administrative level access via SSH for … The caveats of this approach is that the key as well as any passwords have to be transmitted via an unencrypted network connection. All of them support the IEEE 802.3at providing a maximum of 30W per port. PoE models (8HP/10HP/24EP/24HPv2/48HPv2) come with default PoE consumption mode which delivers only the actual power required by your networked devices, reserves the rest and optimizes its power budget. This document is provided as-is without any warranty. Zyxel security advisory for NAS remote access vulnerability, Zyxel security advisory for the Fraunhofer Home Router Security Report 2020, Zyxel security advisory for vulnerabilities of CloudCNM SecuManager, Zyxel security advisory for the remote code execution vulnerability of NAS and firewall products, https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html, Safety, Health, Environment and Energy Policy, Zyxel security advisory for GS1900 switch vulnerabilities. You can barely hear the sound while the switch is operating. Repeat the process for the X.509 certificate: Once the files have been written they can be moved in place: Disable and re-enable HTTPS for web interface: HTTPS should now use the custom key and certificate. Zyxel GS1900 series switches running firmware version 2.40 and earlier have the following vulnerabilities: However, an attacker cannot exploit CVE-2019-15799 to CVE-2019-15804 vulnerabilities unless he/she possesses a user’s privileged account and access via SSH. As of this writing the author is not aware of any other method, though. CVE-2019-15802: Use of hard-coded Cryptographic Key for password encryption. Jan Tore Morken has documented how to enable the Telnet daemon. Fortunately it can be enabled using stty. The GS1900 Series includes both fan-less and built-in smart fan models. When the root shell is opened as described before ^D (Ctrl-D; end of file) does not work. On the switch the key and certificate are stored in /mnt/ssh/ssl_key.pem and /mnt/ssh/ssl_cert.pem respectively. The author is and will not be responsible for any damages that may occur due to its use.

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