SB2020032416 - Multiple vulnerabilities in Schneider Electric IGSS SCADA

Description

This security bulletin contains information about 2 vulnerabilities.

1) Missing Authentication for Critical Function (CVE-ID: CVE-2020-7479)

CWE-ID: CWE-306 - Missing Authentication for Critical Function

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to missing authentication for critical function within the IGSSupdateservice service, which listens on TCP port 12414 by default. A local user can send remote commands to IGSS Update Service without having proper privileges and execute processes.

2) Path traversal (CVE-ID: CVE-2020-7478)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote attacker can send a specially crafted request and read arbitrary files on the system.

Remediation

Install update from vendor's website.

References

• https://www.se.com/ww/en/download/document/SEVD-2020-070-01/
• https://ics-cert.us-cert.gov/advisories/icsa-20-084-02
• https://www.zerodayinitiative.com/advisories/ZDI-20-370/