TippingPoint Zero Day Initiative

Symantec Web Gateway Arbitrary PHP File Upload Remote Code Execution Vulnerability

ZDI-15-443: September 16th, 2015


CVSS Score

Affected Vendors

Affected Products

    Web Gateway

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 19858. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Symantec Web Gateway. Authentication is required to exploit this vulnerability, however it can be bypassed via reflected cross-site scripting.

The specific flaw exists within the admin_messages.php file which relies on mimetypes and file extensions to block potentially dangerous file uploads. An attacker can exploit this condition to upload arbitrary files as the apache user. Due to loose sudo restrictions, an attacker can add the setuid attribute and execute arbitrary code under the context of root.

Vendor Response

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

Disclosure Timeline

    2015-05-06 - Vulnerability reported to vendor
    2015-09-16 - Coordinated public release of advisory


This vulnerability was discovered by:
    Jos Wetzels - LeakFree Security