Advisory Details

April 10th, 2014

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

CVE ID	CVE-2014-0767
CVSS SCORE	7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P
AFFECTED VENDORS	Advantech
AFFECTED PRODUCTS	Advantech WebAccess
VULNERABILITY DETAILS	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 AccessCode 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.
ADDITIONAL DETAILS	Advantech has issued an update to correct this vulnerability. More details can be found at: https://ics-cert.us-cert.gov/advisories/ICSA-14-079-03
DISCLOSURE TIMELINE	2014-01-05 - Vulnerability reported to vendor 2014-04-10 - Coordinated public release of advisory
CREDIT	Tom Gallagher

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