Advisory Details

January 27th, 2022

WECON LeviStudioU UMP File Parsing XY Tag WordAddr2 Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2021-23138
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	LeviStudioU
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of WECON LeviStudioU. 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 XY tags within UMP files. When parsing the WordAddr2 attribute, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length 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://www.cisa.gov/uscert/ics/advisories/icsa-21-355-03
DISCLOSURE TIMELINE	2021-08-20 - Vulnerability reported to vendor 2022-01-27 - Coordinated public release of advisory
CREDIT	Natnael Samson (@NattiSamson)

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