Talos Vulnerability Report

TALOS-2019-0826

Schneider Electric Modicon M580 UMAS cleartext data transmission vulnerability

October 8, 2019
CVE Number

CVE-2019-6845

Summary

An exploitable information disclosure vulnerability exists in the UMAS functionality of the Schneider Electric Modicon M580 Programmable Automation Controller, firmware version SV2.80. An attacker can sniff network traffic to exploit this vulnerability.

Tested Versions

Schneider Electric Modicon M580 BMEP582040 SV2.80

Product URLs

https://www.schneider-electric.com/en/work/campaign/m580-epac/

CVSSv3 Score

5.9 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-319: Cleartext Transmission of Sensitive Information

Details

The Modicon M580 is the latest in Schneider Electric's Modicon line of Programmable Automation Controllers. The device boasts a Wurldtech Achilles Level 2 certification and global policy controls to quickly enforce various security configurations. Communication with the device is possible over FTP, TFTP, HTTP, SNMP, EtherNet/IP, Modbus, and a management protocol referred to as UMAS.

When transferring a new strategy or reading the existing strategy of the Modicon M580 via device programming software, the UMAS management protocol is used. This protocol sends and receives cleartext data, allowing anyone sniffing traffic to view any transmitted information. If the transfer of a new strategy by the device programming software is sniffed, it is possible to obtain sensitive information such as the device SNMP community strings.

Timeline

2019-05-08 - Vendor Disclosure
2019-05-09 - Vendor issued inquiry re: duplicate issue
2019-05-10 - Talos provided additional details to support issue not being a duplicate
2019-09-10 - Disclosure extension provided to vendor
2019-09-13 - Vendor assigned CVE
2019-10-08 - Public Release

Credit

Discovered by Jared Rittle of Cisco Talos.