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Vulnerability Note VU#184473Microgaming Download Helper ActiveX control stack buffer overflowOverviewThe Microgaming Download Helper ActiveX control contains a stack buffer overflow, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.I. DescriptionMicrogaming provides software for online gaming, including online casinos. The Microgaming Download Helper ActiveX control, provided by dlhelper.dll, is vulnerable to stack buffer overflow. Older versions of the control are referred to as "WebHandler Class."II. ImpactBy convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user. The attacker could also cause the web browser to crash.III. SolutionApply an updateThis issue is addressed in version 7.2.0.19 of the Download Helper ActiveX control. Users of the Download Helper ActiveX control can perform the update by following these steps:
If the above steps did not succeed, or if the system has the older "WebHandler Class" control, please use the following workarounds Disable the Download Helper ActiveX control in Internet Explorer The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{AED98630-0251-4E83-917D-43A23D66D507}] "Compatibility Flags"=dword:00000400 Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document. Systems Affected
Referenceshttp://www.cert.org/tech_tips/securing_browser/#Internet_Explorer This vulnerability was reported by Will Dormann of CERT/CC. This document was written by Will Dormann.
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