Advisory Details

July 19th, 2021

Siemens JT2Go ASM File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2021-34327
CVSS SCORE	7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Siemens
AFFECTED PRODUCTS	JT2Go
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Siemens JT2Go. 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 ASM files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.
ADDITIONAL DETAILS	https://us-cert.cisa.gov/ics/advisories/icsa-21-194-15 https://cert-portal.siemens.com/productcert/pdf/ssa-483182.pdf
DISCLOSURE TIMELINE	2021-03-16 - Vulnerability reported to vendor 2021-07-19 - Coordinated public release of advisory
CREDIT	Mat Powell of Trend Micro Zero Day Initiative

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