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Vulnerability Note VU#221700Acer LunchApp ActiveX Control fails to properly restrict access to methodsOverviewThe Acer LunchApp ActiveX control contains methods that can allow a remote, unauthenticated attacker to run arbitrary commands on a vulnerable system.I. DescriptionThe Acer LunchApp ActiveX control is provided by LunchApp.ocx. It contains a method called Run(), which takes three parameters: Drive, FileName, and CmdLine. Although the control is not inherently marked as safe for scripting via the IObjectSafety interface, it may be distributed with the appropriate Implemented Categories registry key to make it safe for scripting. This means that a web page in Internet Explorer can call the Run() method of the control.II. ImpactBy convincing a victim to view an HTML document (web page, HTML email, or email attachment), an attacker could run arbitrary commands with the privileges of the user running IE.III. SolutionApply an updateAcer has provided an update called Acer Preload Security Patch for Windows XP. This update unregisters and deletes the LunchApp.ocx file if it is present in the Windows System directory.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{D9998BD0-7957-11D2-8FED-00606730D3AA}] "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 publicly disclosed by Tan Chew Keong. This document was written by Will Dormann.
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