|2016-03-12|| RTU||Schneider Electric Telvent SAGE RTU||David Formby, Raheem Beyah||N/A||2015-6485||N/A||N/A||N/A|
# Schneider Electric Telvent RTU Improper Ethernet Frame Padding Vulnerability
David Formby and Raheem Beyah of Georgia Tech have identified a vulnerability caused by an Institute of Electrical and Electronics Engineers (IEEE) conformance issue involving improper frame padding in Schneider Electric's Telvent SAGE 2300 and 2400 remote terminal units (RTUs). Schneider Electric has already released a revision that eliminates this vulnerability. This advisory serves as a notification of a new vulnerability in the previous software version. The researchers have tested the revision to validate that it resolves the reported vulnerability.
### AFFECTED PRODUCTS
The following Schneider Electric Telvent RTUs are affected:
Sage 3030M, with firmware prior to C3414-500-S02J2;
Sage 1410, with firmware prior to C3414-500-S02J2;
Sage1430, with firmware prior to C3414-500-S02J2;
Sage 1450, with firmware prior to C3414-500-S02J2;
LANDAC II-2, with firmware prior to C3414-500-S02J2;
Sage 2300, with firmware prior to C3413-500-S01; and
Sage 2400, with firmware prior to C3414-500-S02J2 (released March 2015.)
IEEE 802 specifies that packets have a minimum size of 56 bytes. The Ethernet driver is expected to fill the data field with octets of zero for padding when packets are less than 56 bytes. Resident memory and other data are used for padding in some implementations that could cause information leakage. This attack is passive; the attacker can only see data that the affected device sent out as part of a packet.
Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Schneider Electric is a European-based company that maintains offices in 190 countries worldwide.
The affected products, Telvent Sage 2300/2400 RTUs, are industrial data communications devices. According to Schneider Electric, these products are deployed across several sectors including the Energy sector. Schneider Electric estimates that these products are used primarily in North America.
### VULNERABILITY CHARACTERIZATION
# VULNERABILITY OVERVIEW
IMPROPER ETHERNET FRAME PADDING
The data padding within the data field of the Ethernet pack should be all zeros. The previous implementation of firmware allowed other data from a known area of memory to be used in this field and could exfiltrate or leak data.
CVE-2015-6485 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 and a temporal score of 5.1 have been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C).
### VULNERABILITY DETAILS
The attacker would need to be the receiver of the packet (that contains leaked data) or along the path (e.g., on a local network that does not use encryption).
# EXISTENCE OF EXPLOIT
ICS-CERT is unaware of any exploits that target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability. This is a passive attack; the attacker can only access the data that are contained within the packet.
Schneider-Electric provides a customer web site for access to all Sage RTU vulnerability and update information at:
https://infrastructurecommunity.schneider-electric.com/community/products/infrastructure-products/sage (link is external)
The Telvent Sage 2300 is end of life for security patches, and customers are advised to move to the Sage 2400 platform.
The Telvent SAGE 2300 family is end of life and no longer supported by Schneider Electric. The Telvent SAGE 2400 family is still supported and maintained with patches. Schneider Electric may be contacted using the following:
Sage Support Office
Phone: (713) 920-6832