|
|
|
Vulnerability Note VU#507433Microsoft Speech API ActiveX controls contain buffer overflowsOverviewThe Microsoft Speech API ActiveListen and ActiveVoice ActiveX controls contain multiple buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.I. DescriptionMicrosoft Speech API is a software package that provides text-to-speech and speech recognition capabilities. The Microsoft Speech API includes ActiveX controls called ActiveListen and ActiveVoice, which are provided by Xlisten.dll and XVoice.dll, respectively. These ActiveX controls contain multiple buffer overflow vulnerabilities.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 updateThis issue is addressed by Microsoft Security Bulletin MS07-033. This update sets the kill bit for the vulnerable controls. Please also consider the following workarounds
{EEE78591-FE22-11D0-8BEF-0060081841DE}
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{4E3D9D1F-0C63-11D1-8BFB-0060081841DE}] "Compatibility Flags"=dword:00000400 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{EEE78591-FE22-11D0-8BEF-0060081841DE}] "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.
If you have feedback, comments, or additional information about this vulnerability, please send us
email. |
||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||