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TITLE:
AMX VNC ActiveX Control Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA25891

VERIFY ADVISORY:
http://secunia.com/advisories/25891/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

REVISION:
1.1 originally posted 2007-06-29

SOFTWARE:
AMX VNC ActiveX Control 1.x
http://secunia.com/product/14679/

DESCRIPTION:
rgod has discovered some vulnerabilities in AMX VNC ActiveX Control,
which can be exploited by malicious people to compromise a user's
system.

The vulnerabilities are caused due to boundary errors within the
Amx.AmxVncCtrl.1 (AmxVnc.dll) ActiveX control when handling certain
properties (e.g. "Host", "LogFile", and "Password" properties). These
can be exploited to cause a buffer overflow by assigning an overly
long string to the affected property.

Successful exploitation allows execution of arbitrary code.

The vulnerabilities are confirmed in version 1.0.13.0. Other versions
may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
rgod

CHANGELOG:
2007-06-29: Updated "Description" section.

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/4123

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