Advisory Details

July 19th, 2021

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

ZDI-21-864
ZDI-CAN-13422

CVE ID CVE-2021-34326
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 PAR 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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