Advantech WebAccess webvact.ocx UserName Stack Buffer Overflow Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Advantech WebAccess. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the webvact.ocx ActiveX Control. The control does not check the length of an attacker-supplied UserName string before copying it into a fixed length buffer on the stack. This allows an attacker to execute arbitrary code in the context of the browser process.