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A number of Horner PLC Software program Vulnerabilities Permit Code Execution through Malicious Font Information

By Eduard Kovacs on October 10, 2022

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A cybersecurity researcher has found a complete of seven high-severity distant code execution vulnerabilities in Horner Automation’s Cscape product and so they can all be exploited utilizing malicious font recordsdata.

Horner Automation is a US-based firm that gives options for industrial course of and constructing automation. Its Cscape programmable logic controller (PLC) software program supplies ladder diagram programming and operator interface growth capabilities. In response to the US Cybersecurity and Infrastructure Safety Company (CISA), Cscape is used worldwide, together with within the important manufacturing sector.

Researcher Michael Heinzl has found seven vulnerabilities in Cscape: 4 in 2021 and three in 2022. The primary spherical of vulnerabilities was disclosed in Might 2022, and CISA and the researcher revealed advisories for the second spherical of vulnerabilities in early October. In response to CISA, the seller has launched updates that ought to patch all of those safety holes.

Heinzl described the vulnerabilities as heap-based buffer overflow, out-of-bounds learn/write, and uninitialized pointer points associated to improper validation of user-supplied knowledge when the appliance parses fonts.

An attacker can exploit the failings to execute arbitrary code within the context of the present course of by getting a person to open a specifically crafted font file. The researcher instructed SecurityWeek that the appliance does embrace particular options for coping with fonts. This will improve an attacker’s probabilities of getting a person to open the malicious recordsdata utilizing social engineering methods.

Opening a malicious font file can lead to the attacker’s code getting executed with the privileges of the person who launched the appliance.

These aren’t the one industrial management system (ICS) vulnerabilities recognized by Heinzl. Prior to now two years, the researcher disclosed flaws present in industrial merchandise made by Elcomplus, the CX-Programmer PLC programming software program from Omron, Fuji Electrical’s Tellus manufacturing facility monitoring and working product, Delta Electronics’ DIAEnergie industrial power administration system, and the myPRO HMI/SCADA product of mySCADA.

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