Advisory Details

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

The specific flaw exists within the processing of requests to the Wemo SetSmartDevURL API. A crafted request can trigger execution of a system call composed from a user-supplied string. An attacker can leverage this vulnerability to execute code under the context of root.

This vulnerability is being disclosed publicly without a patch in accordance with the ZDI 120 day deadline.

07/11/17 - ZDI reported vulnerability to vendor
07/11/17 - Vendor acknowledged
11/22/17 - ZDI contacted vendor requesting an status update
01/18/18 - ZDI notified the vendor the intention to 0-day the case

-- Mitigation:
Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the service to trusted machines. Only the clients and servers that have a legitimate procedural relationship with the service should be permitted to communicate with it. This could be accomplished in a number of ways, most notably with firewall rules/whitelisting.

• 2017-07-11 - Vulnerability reported to vendor
• 2018-01-23 - Coordinated public release of advisory