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

March 30th, 2017
ZDI-17-233 ZDI-CAN-4437

CVE ID

CVSS Score

7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected Vendors

Trend Micro

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.

Additional Details

Trend Micro has issued an update to correct this vulnerability. More details can be found at:
https://success.trendmicro.com/solution/1116960

Disclosure Timeline

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

Credit

Steven Seeley of Source Incite

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