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Parrot ANAFI Drone Denial of Service

Medium

Synopsis

Tenable has discovered Denial of Service vulnerabilities in Parrot's Anafi drone affecting firmware versions prior to 1.5.0.

CVE-2019-3944: Wi-Fi Deauthentication

This allows a remote and unauthenticated attacker to sever the drone-to-controller connection by sending Wi-Fi deauth frames, resulting in a Denial of Service. Fallback behavior for Anafi drone is to engage Smart Return to Home (RTH), which attempts to safely return back to take off point, avoiding crashes. 

 

CVE-2019-3945 : Web Server Invalid Memory Access

The “control” service listening for SDK commands can indirectly trigger a crash within the “webserver” running on Anafi drone. By sending a "g_arsdk_cmd_desc_Common_Common_CurrentDateTime" command with a larger than expected Date field, the webserver will crash when accessing SDK notification module due to an invalid memory access. This results in webserver service crashing and restarting.

Solution

Upgrade Anafi to firmware version 1.5.0 or later.

Disclosure Timeline

12/20/2018 - Tenable discovers vulnerabilities.
01/24/2019 - Tenable discloses to Parrot via email
01/30/2019 - Parrot asks followup on OS security questions
02/14/2019 - Tenable responds OS compromise was not achievable through vulns.
02/28/2019 - Tenable asks for update.
03/05/2019 - Parrot notifies that review of details are to come
03/14/2019 - Parrot confirms WebServer crash fix and mitigation for Wifi deauth attack are implemented in firmware version 1.5.0. Explains the effects of a Wi-Fi deauth attack should already be mitigated via "Smart Return to Home" feature.
03/18/2019 - Tenable responds that it did not witness Smart RTH activate in the way that was claimed after Wi-Fi deauth, asked for clarification. As per vulnerability policy, Tenable gives 2 week extension.
03/18/2019 - Parrot explains potential circumstances that may affect Smart RTH mitigation disastrous effects of a Wi-Fi deauth attack. Agrees to give concrete patch in April.
03/20/2019 - Tenable confirms potential circumstances occured that may affect Smart RTH.
04/24/2019 - Tenable confirms Smart RTH engages in flight test
04/29/2019 - Tenable asks for expected patch date
04/30/2019 - Parrot expects patch to be released May 6th

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

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