TippingPoint Zero Day Initiative

(Pwn2Own) Mozilla Firefox resource: URL Remote Code Execution Vulnerability

ZDI-15-110: April 3rd, 2015


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 19609. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Mozilla Firefox. 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 the handling of documents loaded through the resource: URL. As the same flag was used for chrome: and resource: URLs, these pages were able to subsequently load privileged chrome pages. By combining this with a same-origin policy bypass, an attacker could execute arbitrary code in the context of the current user.

Vendor Response

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

Disclosure Timeline

    2015-03-18 - Vulnerability reported to vendor
    2015-04-03 - Coordinated public release of advisory


This vulnerability was discovered by:
    Mariusz Mlynski