Vulnerability Note VU#167623
SHDesigns Resident Download Manager does not authenticate firmware downloads
Original Release date: 31 Jan 2017 | Last revised: 01 Feb 2017

Overview
SHDesigns’ Resident Download Manager (as well as the Ethernet Download Manager) does not authenticate firmware downloads before executing code and deploying them to devices.

Description
CWE-494: Download of Code Without Integrity CheckCVE-2016-6567
SHDesigns’ Resident Download Manager provides firmware update capabilities for Rabbit 2000/3000 CPU boards, which according to the reporter may be used in some industrial control and embedded applications.

The Resident Download Manager does not verify that the firmware is authentic before executing code and deploying the firmware to devices. A remote attacker with the ability to send UDP traffic to the device may be able to execute arbitrary code on the device.

According to SHDesigns’ website, the Resident Download Manager and other Rabbit Tools have been discontinued since June 2011.

Impact
A remote attacker with the ability to send UDP traffic to the device may be able to execute arbitrary code on the device.

Solution
The CERT/CC is currently unaware of a practical solution to this problem.

According to the reporter, affected users may disable the network update feature. It is also possible that developers of products using the Resident Download Manager may be able to write a download verification wrapper around the Resident Download Manager library, but may not be practical in all scenarios.
Affected users may also consider the following workaround:

Restrict network access

Restrict network access to the device containing the Rabbit CPU and Resident Download Manager to a secured LAN segment.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedAddOn TechnologiesAffected20 Jan 201701 Feb 2017
SHDesignsAffected13 Jan 201726 Jan 2017
Cobham plcUnknown05 Dec 201605 Dec 2016
Grass ValleyUnknown20 Jan 201720 Jan 2017
IDC CorporationUnknown20 Jan 201720 Jan 2017
MaguireUnknown20 Jan 201720 Jan 2017If you are a vendor and your product is affected, let
us know.

CVSS Metrics (Learn More)

Group
Score
Vector

Base
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal
8.0
E:POC/RL:U/RC:UR

Environmental
6.0
CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

http://shdesigns.org/rabbit/
https://www.digi.com/products/rabbitprocessor
https://www.digi.com/lp/rabbit
https://cwe.mitre.org/data/definitions/494.html

Credit

Thanks to Nolan Ray of NCC Group for reporting this vulnerability.
This document was written by Garret Wassermann.

Other Information

CVE IDs:
CVE-2016-6567

Date Public:
31 Jan 2017

Date First Published:
31 Jan 2017

Date Last Updated:
01 Feb 2017

Document Revision:
45

FeedbackIf you have feedback, comments, or additional information about this vulnerability, please send us email.

Leave a Reply