Advisory Details

November 18th, 2021

WECON PLC Editor WCP File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2021-42705
CVSS SCORE	7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS	WECON
AFFECTED PRODUCTS	PLC Editor
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of WECON PLC Editor. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of WCP files. 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 current process.
ADDITIONAL DETAILS	WECON has issued an update to correct this vulnerability. More details can be found at: https://us-cert.cisa.gov/ics/advisories/icsa-21-315-01
DISCLOSURE TIMELINE	2021-06-24 - Vulnerability reported to vendor 2021-11-18 - Coordinated public release of advisory
CREDIT	Natnael Samson (@NattiSamson)

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