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

April 10th, 2014
ZDI-14-074 ZDI-CAN-2012

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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