TippingPoint Zero Day Initiative

Advantech WebAccess webvrpcs drawsrv Arbitrary Free Remote Code Execution Vulnerability

ZDI-18-063: January 5th, 2018

CVSS Score

Affected Vendors

Affected Products

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Advantech WebAccess. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of the 0x2721 IOCTL in the webvrpcs process. The issue results from the lack of proper validation of a user-supplied value prior to using it as a memory address in a free operation. An attacker can leverage this functionality to execute code under the context of Administrator.

Vendor Response

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

Disclosure Timeline

    2017-07-28 - Vulnerability reported to vendor
    2018-01-05 - Coordinated public release of advisory


This vulnerability was discovered by:
    Steven Seeley (mr_me) of Offensive Security