ICQ 6.5 HTML-injection vulnerability

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ShineShadow Security Report  14082009-08

TITLE 

ICQ 6.5 HTML-injection vulnerability

BACKGROUND 

With more than 700 million instant messages sent and received every day, ICQ 
has been known to the online community as a messaging service. Today, a little 
more than a decade after the first ICQ instant messaging service was launched 
it has become much more than just that. 
ICQ is a personal communication tool that allows users to meet and interact 
through instant messaging services such as text, voice, video and VoIP as well 
as various entertainment and community products. 

Source: http://www.icq.com

VULNERABLE PRODUCTS 

ICQ 6.5 build 1042 (latest build)
Previous versions and localized distributions may also be affected

DETAILS 

HTML-injection vulnerability exists in official ICQ client software. Incoming 
message window in the vulnerable ICQ client has a web browser nature. An 
attacker can try to exploit the vulnerability by sending specially crafted 
message to the remote ICQ client. The malicious message can contain text data 
which will be interpreted and displayed in the incoming message window as a 
HTML code. Potentially an arbitrary HTML code could be injected.
There are two impacts of the vulnerability has been detected:
1.Information disclosure
For example, an attacker can inject <IMG> tag that could lead information 
disclosure (such as remote client?s IP address, browser version, OS version, 
etc.)
2.Spoofing
An attacker can spoof ICQ client software?s system messages, interface elements 
(buttons, links) in the message window, etc. For example, it could be used for 
forcing of the ICQ users to click on attacker?s malicious link.
Maybe other impacts are possible.

EXPLOITATION 

Remote attacker can exploit this vulnerability using any instant messenger 
software with OSCAR (ICQ) protocol support by sending specially crafted message.
Example of exploit message:
file://1"></a>[HTML CODE]
Notice that internal ICQ antispam engine will blocked some text/html data if 
attacker?s ICQ UIN not in user?s ICQ contact list.

DISCLOSURE POLICY

The ?Full disclosure? policy has been applied. Vendor has not been contacted.

CREDITS 

Maxim A. Kulakov (aka ShineShadow)
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