TippingPoint Zero Day Initiative

Unitronics VisiLogic OPLC IDE vlp File Parsing Stack Buffer Overflow Remote Code Execution Vulnerability

ZDI-16-375: June 24th, 2016


CVSS Score

Affected Vendors

Affected Products

    VisiLogic OPLC IDE

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Unitronics VisiLogic OPLC IDE. 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 parsing of a vlp file, which uses the zip file format. The software fails to validate the length of the filename field within the file before copying it to a stack buffer. This vulnerability can be leveraged by an attacker to achieve code execution within the context of the process.

Vendor Response

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

Disclosure Timeline

    2016-04-28 - Vulnerability reported to vendor
    2016-06-24 - Coordinated public release of advisory


This vulnerability was discovered by:
    Steven Seeley of Source Incite