Clever Attack Allows Theft Of Names & Addresses From IE & Safari

The New Acunetix V12 Engine


There has been some very clever attacks lately, especially involving browsers and the kind of data they can leak when probed the right way. The biggest press recently was generated by the history leak that occurs in most browsers.

Another clever attack that got some coverage lately was tabnapping and the latest is another fascinating way to lift information from browsers using the auto-complete feature.

It’s good to see these kind of attacks, when you think about technically how they operate – they are fairly simple. But in saying that it takes a leap in logic to even get to the point where you can start coding for something like this.

The Internet Explorer, Firefox, Chrome, and Safari browsers are susceptible to attacks that allow webmasters to glean highly sensitive information about the people visiting their sites, including their full names, email addresses, location, and even stored passwords, a security researcher says.

In a talk scheduled for next week’s Black Hat security conference in Las Vegas, Jeremiah Grossman, CTO of White Hat Security, plans to detail critical weaknesses that are enabled by default in the browsers, which are the four biggest by market share. The vulnerabilities have yet to be purged by the respective browser makers despite months, and in some cases, years of notice.

Among the most serious is a vulnerability in Apple’s Safari and earlier versions of Microsoft’s IE that exposes names, email addresses, and other sensitive information when a user visits a booby-trapped website. The attack exploits the browsers’ autocomplete feature used to automatically enter commonly typed text into websites. It works by creating a webpage with fields carrying titles such as “First Name,” “Last Name,” “Email Address,” and “Credit Card Number” and then adding javascript that simulates the user entering various letters, numbers or keystrokes into each one.

It seems all 4 of the main browsers are susceptible to this, although the implementation varies slightly for each browser. Hacking wise that’s not a big problem as you can just do a user agent string identification when the user lands on the malicious page and serve them up with the relevant info grabbing script for their browser type.

The worst case scenario is if this flaw allows malicious pages to gather user passwords that are stored in the browser, combined with the ability to probe the browser to see which sites they have visited..it could multiply into a quite accurate and potentially dangerous attack.

The worst effected is the Safari and older versions of Internet Explorer.


Users who in the past have used the autocomplete features to store that information in versions 6 and 7 of IE or versions 4 and 5 of Safari will find that the information will be automatically zapped to the rogue website. No interaction is necessary other than to visit the page. Webmasters can set the input fields to be invisible to better conceal the attack.

In the case of Safari, Grossman’s proof-of-concept attack simulates a user entering various letters or numbers into the fields. In a demonstration, when the script entered the letter J under a field titled “Name,” the browser automatically exposed “Jeremiah Grossman” to the web server. Grossman said he alerted Apple to the vulnerability on June 17, but received no reply other than an automatic response saying his message had been received.

“I would never have talked about this publicly if Apple had taken this seriously,” he told The Register. “I figured somebody else must have found this before because it’s so brain-dead simple.” When he sent a follow up query “I never heard anything back, human or robotic.”

Tricking IE 6 and 7 into coughing up the autocomplete details works in a similar fashion, but instead of simulating the entering of numbers or letters into a field, Grossman enters a user’s down arrow twice and then the enter key to extract the stored information. If more than one record is stored in that field, the script will repeat the process so they can be lifted as well.

Apart from the above flaws he seems to have uncovered a whole lot of bugs in all the major browsers including ways to steal passwords from Firefox and Chrome by using bugs + XSS attacks.

Another neat trick is the ability to erase all cookies on a users computer, not really dangerous but certainly annoying. The trick is to spawn more cookies than the browser can handle (about 3000 for Firefox) so the browser will delete all older cookies. The PoC for this takes about 2.5 seconds!

It’ll be interesting to see the whole talk at BlackHat.

Source: The Register

Posted in: Exploits/Vulnerabilities, Privacy, Web Hacking

, , , , , , ,


Latest Posts:


Domained - Multi Tool Subdomain Enumeration Domained – Multi Tool Subdomain Enumeration
Domained is a multi tool subdomain enumeration tool that uses several subdomain enumeration tools and wordlists to create a unique list of subdomains.
Acunetix Vulnerability Scanner For Linux Now Available Acunetix Vulnerability Scanner For Linux Now Available
Acunetix Vulnerability Scanner For Linux is now available, now you get all of the functionality of Acunetix, with all of the dependability of Linux.
Gerix WiFi Cracker - Wireless 802.11 Hacking Tool With GUI Gerix WiFi Cracker – Wireless 802.11 Hacking Tool With GUI
Gerix WiFi cracker is an easy to use Wireless 802.11 Hacking Tool with a GUI, it was originally made to run on BackTrack and this version has been updated for Kali (2018.1).
Malcom - Malware Communication Analyzer Malcom – Malware Communication Analyzer
Malcom is a Malware Communication Analyzer designed to analyze a system's network communication using graphical representations of network traffic.
WepAttack - WLAN 802.11 WEP Key Hacking Tool WepAttack – WLAN 802.11 WEP Key Hacking Tool
WepAttack is a WLAN open source Linux WEP key hacking tool for breaking 802.11 WEP keys using a wordlist based dictionary attack.
Eraser - Windows Secure Erase Hard Drive Wiper Eraser – Windows Secure Erase Hard Drive Wiper
Eraser is a hard drive wiper for Windows which allows you to run a secure erase and completely remove sensitive data from your hard drive by overwriting it several times with carefully selected patterns.


One Response to Clever Attack Allows Theft Of Names & Addresses From IE & Safari

  1. alex2308 July 21, 2010 at 11:04 am #

    Well, it is not THAT new. You can even read about similar attacks in printed books (at least one – Hacking – The new generation).