TippingPoint Zero Day Initiative

Mozilla Firefox ClearKeyDecryptor Integer Overflow Remote Code Execution Vulnerability

ZDI-17-320: May 3rd, 2017


CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 24745. 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 ClearKey encrypted media. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before writing to memory. An attacker can leverage this vulnerability to execute arbitrary code under the context of the plugin-container container process.

Vendor Response

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

Disclosure Timeline

    2017-03-01 - Vulnerability reported to vendor
    2017-05-03 - Coordinated public release of advisory


This vulnerability was discovered by: