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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-20-084-02) Schneider Electric IGSS SCADA Software
27 March 2020
AusCERT Security Bulletin Summary
Product: Schneider Electric IGSS SCADA Software
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Increased Privileges -- Existing Account
CVE Names: CVE-2020-7479 CVE-2020-7478
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ICS Advisory (ICSA-20-084-02)
Schneider Electric IGSS SCADA Software
Original release date: March 24, 2020
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1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Schneider Electric
o Equipment: IGSS (Interactive Graphical SCADA System)
o Vulnerabilities: Path Traversal, Missing Authentication for Critical
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in unauthorized
access to sensitive data and functions.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of IGSS are affected:
o Versions 14 and prior using the service IGSSupdate
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
The affected product could allow a remote unauthenticated attacker to read
arbitrary files on the device.
CVE-2020-7478 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
3.2.2 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306
The affected product could allow a local user to execute processes that
otherwise require escalation privileges when sending local network commands to
the IGSS update service.
CVE-2020-7479 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
Trend Micro's Zero Day Initiative (ZDI) reported these vulnerabilities to CISA.
Schneider Electric has provided IGSS14 Version 184.108.40.20609 to address these
vulnerabilities. Users are recommended to update to IGSS Version 14 .
Alternatively, the following workarounds and mitigations can be applied to
o Disable the IGSS Update service when it is not required installing updates
using the service.
o Keep the infrastructure offline and do not allow Windows login and network
access for untrusted people and sources.
For more information, see the Schneider Electric security notification .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
o Ensure the least-privilege user principle is followed.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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