ZyNOS is the proprietary operating system used on network devices made by Zyxel Communications.[1] The name is a contraction of Zyxel and Network Operating System (NOS).
History
Zyxel first introduced ZyNOS in 1998.[2]
Versions
Zyxel released ZyNOS version 4.0 for their GS2200 series 24 and 48 port ethernet switches in April, 2012.[3] It appears that versions differ between Zyxel products.
Access methods
Web and/or command-line interface (CLI) depending on the device. Web access is accomplished by connecting an Ethernet cable between a PC and an open port on the device and entering the IP address of the device into the Web browser.[4] An RS-232 serial console port is provided on some devices for CLI access, which is accomplished by using SSH or telnet.[5]
CLI command types
Listed below are the categories that the CLI commands are grouped by.[6]
Web Configurator
The Web Configurator is divided into the following categories:[7][4]
- basic settings
- advanced application
- IP application
- management
Security advisories
As of January 2014 a ZyNOS ROM-0 vulnerability has been identified.[8] This vulnerability allowed attacker to download router's configuration (ROM-0 file) without any type of authentication required. Such configuration file can be later decompressed[9][10] to expose router's administrator password, ISP password, wireless password etc.
As of March 2014[update], Danish computer security company Secunia reports no unpatched advisories or vulnerabilities on ZyNOS version 4.x.[11]
As of March 2014[update], Secunia reports seven advisories and six vulnerabilities on ZyNOS version 3.x. Five advisories are unpatched; Secunia rates the most severe unpatched advisory as less critical.[12]
As of January 2015[update], a DNS vulnerability has been found in certain ZyNOS firmware versions. The versions that are affected have not been narrowed down. The attack can be done from a remote location regardless if the user interface is accessible from the outside of a LAN.[13]
References
- ^ Tseng, Mickey. "ZyNOS General FAQ". Zyxeltech.de. Retrieved 2014-03-07.
- ^ "Timeline". Archived from the original on 2012-05-31. Retrieved 2012-06-06.
- ^ "ZYXEL LAUNCHES IPv6 UPGRADE FOR BUSINESS SECURITY GATEWAYS AND ETHERNET SWITCHES". Archived from the original on 2012-05-12. Retrieved 2012-06-06.
- ^ a b "ZyBook2.book" (PDF). Retrieved 2014-03-07.
- ^ "Ethernet Switch Reference Guide V3.90 (Nov 2008)" (PDF). Retrieved 2014-03-07.
- ^ Tseng, Mickey. "ZyNOS CI Command List". Zyxeltech.de. Retrieved 2014-03-07.
- ^ ftp://ftp2.zyxel.com/GS2200-24P/user_guide/GS2200-24P_4.00_ed1.pdf
- ^ Nasro (2014-01-11). "How I saved your a** from the ZynOS (rom-0) attack !! ( Full disclosure )". root@Nasro. Retrieved 2019-08-18.
- ^ "ZyNOS ROM-0 DECODER".
- ^ Soo, Jacob (2015-05-12), GitHub - jacobsoo/ROM0_Decoder: Rom0 Decoder., retrieved 2019-08-18
- ^ "ZyXEL ZyNOS 4.x". Secunia. Retrieved 2014-03-07.
- ^ "ZyXEL ZyNOS 3.x". Secunia. Retrieved 2014-03-07.
- ^ "DNS hijacking flaw affects D-Link DSL router, possibly other devices". Lucian Constantin. Retrieved 2015-01-30.