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Vulnerability Note VU#308087VeriSign Managed PKI Configuration Checker ActiveX control stack buffer overflowOverviewThe VeriSign Configuration Checker ActiveX control contains a stack buffer overflow, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.I. DescriptionThe VeriSign Configuration Checker ActiveX control is provided by web-based digital certificate enrollment sites and also by the VeriSign Managed PKI OnSiteMSI package. This control is vulnerable to a stack buffer overflow in the VerCompare() method, which can allow an overwrite of the process Structured Exception Handler (SEH).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 Internet Explorer (or the program using the WebBrowser control) to crash.III. SolutionApply an updateVeriSign Japan has published a page to check if the vulnerable ActiveX control is installed. If the vulnerable control is found, a download link to an update is provided. This update removes the VSCnfChk.dll file, which provides the vulnerable ActiveX control. Please note that this update will not prevent the vulnerable control from being installed again in the future. Therefore, we recommend the following workarounds:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{08F04139-8DFC-11D2-80E9-006008B066EE}] "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 VeriSign Japan. This document was written by Will Dormann and Chris Taschner.
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