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TITLE:
SmartCode VNC Manager VNC Viewer ActiveX Control Buffer Overflow

SECUNIA ADVISORY ID:
SA25203

VERIFY ADVISORY:
http://secunia.com/advisories/25203/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
SmartCode VNC Manager 3.x
http://secunia.com/product/10785/

DESCRIPTION:
shinnai has discovered a vulnerability in SmartCode VNC Manager,
which can be exploited by malicious people to compromise a user's
system.

The vulnerability is caused due to a boundary error within the VNC
Viewer ActiveX Control (scvncctrl.dll) when handling arguments passed
to the "ConnectAsyncEx()" method. This can be exploited to cause a
heap-based buffer overflow via an overly long string passed as the
first argument to the said method.

Successful exploitation allows execution of arbitrary code when a
user visits a malicious website.

The vulnerability is confirmed in version 3.6.18.0 Enterprise
Edition. Other versions may also be affected.

SOLUTION:
Set the kill-bit for the affected ActiveX control.

PROVIDED AND/OR DISCOVERED BY:
shinnai

ORIGINAL ADVISORY:
http://moaxb.blogspot.com/2007/05/moaxb-08-smartcode-vnc-manager-36.html

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