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Rockwell Automation EWEB SNMP Denial of Service

Medium
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Synopsis

While working with Rockwell Automation's 1756-EWEB, Tenable discovered an unauthenticated remote attacker could trigger a denial of service condition in the SNMP service by sending a zero length SNMP packet to the device. Note that the control functionality of the device is unaffected. This vulnerability can easily be recreated using hping3:

 hping3 -2 -p 161

Solution

Follow Rockwell Automation's suggested actions in their advisory.

Additional References

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1084268

Disclosure Timeline

09/28/2018 - Vulnerability found.
11/02/2018 - Rockwell notified via encrypted email. 90 day is Feb. 4, 2019
11/08/2018 - Rockwell reproduced the issue.
01/03/2019 - Tenable asks for an update.
01/04/2019 - Rockwell provides an update.
01/22/2019 - Rockwell assigned CVE-2018-19016 and contacted ICS-CERT. Indicates they will be ready for Feb. 4th.
01/23/2019 - Tenable acknowledges and promises a draft advisory.
01/25/2019 - Rockwell provides a draft advisory and the link where it will appear on Feb. 4th.
01/30/2019 - Rockwell asks for Tenable's draft advisory.
01/31/2019 - Tenable provides a draft advisory.
02/01/2019 - Rockwell provides feedback.
02/04/2019 - Rockwell informs Tenable that their advisory has been published.

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]

Risk Information

CVE ID: CVE-2018-19016
Tenable Advisory ID: TRA-2019-06
Credit:
John Lampe
Ben Smith
Cesar Navas
Stephen Jungck
Dan Coppock
Dimitriy Dade
Aleks McKinney
Aaron Luft
Kyle Kelley
Stephen Baronowsky
Iain Kyte
Ron Erdman
Scott Clement
CVSSv2 Base / Temporal Score:
5.0 / 4.8
CVSSv2 Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P
Affected Products:
1756-EWEB v5.001 and below
1768-EWEB, v2.005 and below
Risk Factor:
Medium

Advisory Timeline

02/04/2019 - Initial Release
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