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RSLinx Classic Stack Buffer Overflow

Critical

Synopsis

Tenable discovered an unauthenticated remote stack buffer overflow vulnerability in RSLinx Classic. The vulnerability, located in ENGINE.dll, occurs when an unauthenticated, remote attacker specifies a large ClassAndInstance to TCP port 44818.

Solution

Rockwell has released patches and secure deployment guidelines. Visit their advisory for complete instructions.

Disclosure Timeline

12/06/2018 - Disclosed to [email protected] 90 day date is March 6, 2019.
12/06/2018 - Rockwell acknowledges receipt.
01/03/2019 - Tenable asks for an update.
01/04/2019 - Rockwell provides update and asks Tenable about future plans.
01/04/2019- Tenable replies and points out some details in Tenable's disclosure policy.
02/08/2019 - Rockwell updates Tenable on progress.
02/08/2019 - Tenable thanks Rockwell.
02/25/2019 - Rockwell sends Tenable a draft advisory.
02/25/2019 through 02/28/2019 - Tenable and Rockwell learn the limitations of Mailvelope.
02/28/2019 - Tenable acknowledges the draft advisory.
03/01/2019 - Tenable sends a draft advisory to Rockwell.
03/04/2019 - Rockwell acknowledges Tenable's draft and publishes.

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-2019-6553
Tenable Advisory ID
TRA-2019-11
CVSSv2 Base / Temporal Score
10.0 / 7.8
CVSSv2 Vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
Affected Products
RSLinx Classic, v4.10.00 and earlier
Risk Factor
Critical

Advisory Timeline

03/04/2019 - Initial Release
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