Google Chrome FTP PASV IP Malicious Port Scanning Vulnerability.

[Aditya K Sood <0kn0ck@xxxxxxxxxxxx>]

Advisory: Google Chrome FTP PASV IP Malicious Port Scanning Vulnerability.

Version Affected:
Google Chrome: 1.0.154.36

Description:
Google Chrome FTP Client is vulnerable to FTP PASV malicious port
scanning vulnerability. The username in the
FTP (ftp://username:password@xxxxxxxxxx) can be manipulated by tampering
it with certain IP address with
specification of port as
(ftp://xxx.xxx.xxx.xxx-22:password@xxxxxxxxxx).The Google Chrome FTP
client make
connection to the rogue FTP server which uses PASV commands to scan
network.Dynamic requests are issued to a
rogue FTP server which accepts connection with different usernames as
the IP address with specified ports to locate
the non existing object on the target domain.

Request 1 : ftp://xxx.xxx.xxx.xxx-21:password@xxxxxxxxxx
Request 2 : ftp://xxx.xxx.xxx.xxx-22:password@xxxxxxxxxx
Request 3 : ftp://xxx.xxx.xxx.xxx-23:password@xxxxxxxxxx
Request 4 : ftp://xxx.xxx.xxx.xxx-25:password@xxxxxxxxxx

JavaScript Port Scanning is used to exploit this issue. A malicious web
page hosted on a specially-coded FTP server
could use this feature to perform a generic port-scan of machines inside
the firewall of the victim.The generated
fraudulent request helps attacker to exhibit internal network
information through sustainable port scanning through
JavaScript.

Proof of Concept:
http://www.secniche.org/gcfpv

Links:
http://secniche.org/gcfps.html
http://evilfingers.com/advisory/index.php

Detection:
SecNiche confirmed this vulnerability affects Google Chrome on Microsoft
Windows XP SP2 platform.
The versions tested are:

Chrome: 1.0.154.36

Disclosure Timeline:
Disclosed: 1 January 2009
Release Date. 4 January 2009

Vendor Response:
Google acknowledges this vulnerability by reproducing the issue. Views
have been exchanged over the
 severity level of this flaw.The chrome ID of this issue is 5978.

Credit:
Aditya K Sood

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of publishing based on currently
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