Advisory Details

May 11th, 2021

Schneider Electric C-Bus Toolkit Incorrect Permission Assignment Privilege Escalation Vulnerability

CVE ID	CVE-2021-22716
CVSS SCORE	7.8, AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Schneider Electric
AFFECTED PRODUCTS	C-Bus Toolkit
VULNERABILITY DETAILS	This vulnerability allows local attackers to execute arbitrary code on affected installations of Schneider Electric C-Bus Toolkit. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the product installer. The issue results from incorrect permissions set on product folders created by the installer. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of SYSTEM.
ADDITIONAL DETAILS	Schneider Electric has issued an update to correct this vulnerability. More details can be found at: https://us-cert.cisa.gov/ics/advisories/icsa-21-105-01
DISCLOSURE TIMELINE	2020-12-22 - Vulnerability reported to vendor 2021-05-11 - Coordinated public release of advisory
CREDIT	Simon Zuckerbraun - Trend Micro Zero Day Initiative

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