Advisory Details

February 24th, 2021

Siemens JT2Go PAR File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-21-228
ZDI-CAN-12043

CVE ID CVE-2020-27002
CVSS SCORE 3.3, (AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
AFFECTED VENDORS Siemens
AFFECTED PRODUCTS JT2Go
VULNERABILITY DETAILS

This vulnerability allows remote attackers to disclose sensitive information 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 user-supplied data, which can result in a read before the start of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process.

ADDITIONAL DETAILS Siemens has issued an update to correct this vulnerability. More details can be found at:
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-06
DISCLOSURE TIMELINE
  • 2020-12-02 - Vulnerability reported to vendor
  • 2021-02-24 - Coordinated public release of advisory
CREDIT rgod
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