FiberHome Directory Traversal

### Vulnerability Summary The following advisory describes a directory traversal vulnerability found in FiberHome routers. FiberHome Technologies Group “was established in 1974. After continuous and intensive development for over 40 years, its business has been extended to R&D, manufacturing, marketing & sales, engineering service, in 4 major areas: fiber-optic communications, data networking communications, wireless communication, and intelligentizing applications. In particular, it has been providing end-to- end solutions integrated with opto-electronic devices, opticpreforms, fiber & cables, and optical communication systems to many countries around the world.” ### Credit An independent security researcher has reported this vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program. ### Vendor response We tried to contact FiberHome since September 6 2017, repeated attempts to establish contact went unanswered. At this time there is no solution or workaround for the vulnerability. ### Vulnerability details User controlled input is not sufficiently sanitized when passed to /cgi-bin/webproc. /cgi-bin/webproc receives getpage= as parameter input. When we pass the directory of a file as a parameter input with parameter var:page, we will get the file from the router. ### Proof of Concept  ``` http://+IP+ /cgi-bin/webproc?getpage=/etc/shadow&var:language=en_us&var:page=wizardfifth ```