Hard-coded credentials and command-injection vulnerabilities on BigPond 3G21WB

Title:           Hard-coded credentials and command-injection vulnerabilities 
     on BigPond 3G21WB
Discovery date:  17/09/2012
Release date:    11/10/2012
Credits:         Roberto Paleari (roberto@greyhats.it, @rpaleari)

Class:           Authentication bypass, command-injection

We confirm the following device models to be affected:
   * BigPond 3G21WB

Similar routers are probably vulnerable to these very same issues.

The firmware running on the affected routers is subject to multiple security
issues that allow an unauthenticated attacker to gain administrative access to
the device and execute arbitrary commands. In the following paragraphs we
describe the details of the vulnerabilities we identified.

a) Hard-coded credentials
   A user can authenticate to the web server running on the device using the
   credentials "Monitor:bigpond1". These credentials are hard-coded, and cannot
   be changed by a normal user.

b) Command-injection vulnerability
   The "ping.cgi" web page is subject to a command-injection vulnerability, as
   the server-side script does not properly validate user-supplied input.

   The following URL exploits this issue, executing the "ls /" command:
   http://<device IP address>/ping.cgi?DIA_IPADDRESS=;%20cat%20/etc/passwd

We are not aware of an updated firmware that corrects the issues described in
this advisory. We suggest users to disable web access on the WAN side.

    * 17/09/2012 - Initial vendor contact.

    * 18/09/2012 - Vendor replied asking for details.

    * 19/09/2012 - The author replied and asked for a technical
                   contact. Disclosure date set to October 10th, 2012 (3

    * 19/09/2012 - Vendor replied, providing the phone contact number of the
                   Technical Support Department.

    * 20/09/2012 - The author replied, asking to keep all the communication
                   through e-mail, in order to keep track of the whole

    * 24/09/2012 - No response from the vendor. The author re-sent the last

    * 04/10/2012 - No response from the vendor. The author re-sent the last
                   e-mail (again).

    * 11/10/2012 - Still no response from the vendor. Disclosure.

The author is not responsible for the misuse of the information provided in
this security advisory. The advisory is a service to the professional security
community. There are NO WARRANTIES with regard to this information. Any
application or distribution of this information constitutes acceptance AS IS,
at the user's own risk. This information is subject to change without notice.
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BigPond 3G21WB Multiple Vulnerabilities

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