TippingPoint Zero Day Initiative

Advantech WebAccess Product Installation File Access Control Modification Privilege Escalation Vulnerability

ZDI-17-713: August 30th, 2017


CVSS Score

Affected Vendors

Affected Products

Vulnerability Details

This vulnerability allows local attackers to escalate privilege on vulnerable installations of Advantech WebAccess. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the access control that is set and modified during the installation of the product. The product installation weakens access control restrictions of pre-existing system files and sets weak access control restrictions on new files. An attacker can leverage this vulnerability to execute arbitrary code under the context of Administrator, the IUSR account, or SYSTEM.

Vendor Response

Advantech has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2017-06-16 - Vulnerability reported to vendor
    2017-08-30 - Coordinated public release of advisory


This vulnerability was discovered by:
    Fritz Sands - Trend Micro Zero Day Initiative