1. EXECUTIVE SUMMARY

  • CVSS v3 7.8
  • ATTENTION: Low skill level to exploit
  • Vendor: Schneider Electric
  • Equipment: Interactive Graphical SCADA System (IGSS)
  • 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:

  • 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

  • CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical Manufacturing, Energy
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • 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:

  • Avoid importing CGF files from untrusted sources
  • Users should also consider upgrading to the latest product offering IGSS v15 to resolve this issue.

CISA recommends users take the following measures to protect themselves from 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.

Source:

https://us-cert.cisa.gov/ics/advisories/icsa-20-324-04