Advisory Details

October 14th, 2021

Fatek Automation Communication Server Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2021-38432
CVSS SCORE	9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Fatek Automation
AFFECTED PRODUCTS	Communication Server
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Fatek Automation Communication Server. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of data sent to the Facon Server, which listens on port 500 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the FaconSvr process.
ADDITIONAL DETAILS	Fatek Automation has issued an update to correct this vulnerability. More details can be found at: https://us-cert.cisa.gov/ics/advisories/icsa-21-280-07
DISCLOSURE TIMELINE	2021-06-11 - Vulnerability reported to vendor 2021-10-14 - Coordinated public release of advisory
CREDIT	Natnael Samson (@NattiSamson)

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