TippingPoint Zero Day Initiative

QNAP QTS Web change_password Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-17-1006: December 20th, 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 29875. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of QNAP QTS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of the OLD_PASSWORD parameter provided to the change_password.cgi endpoint. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code under the context of root.

Vendor Response

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

Disclosure Timeline

    2017-10-09 - Vulnerability reported to vendor
    2017-12-20 - Coordinated public release of advisory


This vulnerability was discovered by: