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

July 19th, 2021
ZDI-21-853 ZDI-CAN-13402

CVE ID

CVE-2021-34317

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 PCX 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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