TippingPoint Zero Day Initiative

Trend Micro InterScan Web Security Virtual Appliance transparent_setting CRLF Injection Authentication Bypass Vulnerability

ZDI-17-233: March 30th, 2017

CVSS Score

Affected Vendors

Affected Products

    InterScan Web Security Virtual Appliance

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication on vulnerable installations of Trend Micro InterScan Web Security Virtual Appliance. Authentication is not required to exploit this vulnerability.

The specific flaw exists within transparent_setting. The issue results from the lack of proper validation of a user-supplied string before using it to modify a system configuration file. An attacker can leverage this vulnerability to bypass system authentication.

Vendor Response

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

Disclosure Timeline

    2017-01-19 - Vulnerability reported to vendor
    2017-03-30 - Coordinated public release of advisory


This vulnerability was discovered by:
    Steven Seeley of Source Incite