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AUSCERT External Security Bulletin Redistribution
ESB-2020.4088
Advisory (icsa-20-324-04) Schneider Electric Interactive
Graphical SCADA System (IGSS)
18 November 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Schneider Electric Interactive Graphical SCADA System (IGSS)
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7558 CVE-2020-7557 CVE-2020-7556
CVE-2020-7555 CVE-2020-7554 CVE-2020-7553
CVE-2020-7552 CVE-2020-7551 CVE-2020-7550
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-324-04
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ICS Advisory (ICSA-20-324-04)
Schneider Electric Interactive Graphical SCADA System (IGSS)
Original release date: November 17, 2020
Legal Notice
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service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low skill level to exploit
o Vendor: Schneider Electric
o Equipment: Interactive Graphical SCADA System (IGSS)
o Vulnerabilities: Improper Restriction of Operations within the Bounds of a
Memory Buffer, Out-of-bounds Write, Out-of-bounds Read
2. RISK EVALUATION
Successful exploitation of these vulnerabilities may result in remote code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of IGSS are affected:
o IGSS Definition (Def.exe) Version 14.0.0.20247 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
An improper restriction of operations within the bounds of a memory buffer
vulnerability could cause remote code execution when a malicious CGF
(Configuration Group File) is imported to IGSS Definition.
CVE-2020-7550 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
An improper restriction of operations within the bounds of a memory buffer
vulnerability could cause remote code execution when a malicious CGF
(Configuration Group File) is imported to IGSS Definition.
CVE-2020-7551 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.3 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
An improper restriction of operations within the bounds of a memory buffer
vulnerability could cause remote code execution when a malicious CGF
(Configuration Group File) is imported to IGSS Definition.
CVE-2020-7552 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.4 OUT-OF-BOUNDS WRITE CWE-787
An out-of-bounds write vulnerability could cause remote code execution when a
malicious CGF (Configuration Group File) is imported to IGSS Definition.
CVE-2020-7553 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.5 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
An improper restriction of operations within the bounds of a memory buffer
vulnerability could cause remote code execution when a malicious CGF
(Configuration Group File) is imported to IGSS Definition.
CVE-2020-7554 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.6 OUT-OF-BOUNDS WRITE CWE-787
An out-of-bounds write vulnerability could cause remote code execution when a
malicious CGF (Configuration Group File) file is imported to IGSS Definition.
CVE-2020-7555 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.7 OUT-OF-BOUNDS WRITE CWE-787
An out-of-bounds write vulnerability could cause remote code execution when a
malicious CGF (Configuration Group File) is imported to IGSS Definition.
CVE-2020-7556 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.8 OUT-OF-BOUNDS READ CWE-125
An out-of-bounds read vulnerability could cause remote code execution when a
malicious CGF (Configuration Group File) is imported to IGSS Definition.
CVE-2020-7557 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.9 OUT-OF-BOUNDS WRITE CWE-787
An out-of-bounds write vulnerability could cause remote code execution when a
malicious CGF (Configuration Group File) is imported to IGSS Definition.
CVE-2020-7558 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:N/UI:R/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical
Manufacturing, Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
Kimiya, working with Trend Micro's Zero Day Initiative, reported these
vulnerabilities to CISA.
4. MITIGATIONS
Schneider Electric has provided a new version of the IGSS Definition module to
address these vulnerabilities. Users are recommended to update to IGSS Version
14.0.0.20248
Alternatively, the following workarounds and mitigations can be applied to
reduce risk:
o Avoid importing CGF files from untrusted sources
o Users should also consider upgrading to the latest product offering IGSS
v15 to resolve this issue.
For more information, see Schneider Electric security notification
SEVD-2020-315-03
CISA recommends users take the following measures to protect themselves from
social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
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.cisa.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.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
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. These
vulnerabilities are not exploitable remotely.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
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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