TippingPoint Zero Day Initiative

BitTorrent Sync btsync: Protocol Command Injection Remote Code Execution Vulnerability

ZDI-15-115: 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 16990. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of BitTorrent Sync. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The vulnerability relates to how BitTorrent Sync handles URLs with the btsync protocol. By navigating the user to a specially formed link starting with btsync:, an attacker can inject arbitrary command line parameters that will be passed to BTSync.exe. An attacker can leverage this vulnerability to execute code under the context of the current user.

Vendor Response

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

Disclosure Timeline

    2014-11-06 - Vulnerability reported to vendor
    2015-04-03 - Coordinated public release of advisory


This vulnerability was discovered by:
    Andrea Micalizzi (rgod)