Advisory Details

December 8th, 2021

Bentley View DGN File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

ZDI-21-1502
ZDI-CAN-14892

CVE ID CVE-2021-34914
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS Bentley
AFFECTED PRODUCTS View
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Bentley View. 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 DGN files. Crafted data in a DGN file can trigger a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Bentley has issued an update to correct this vulnerability. More details can be found at:
https://www.bentley.com/en/common-vulnerability-exposure/BE-2021-0009
DISCLOSURE TIMELINE
  • 2021-08-16 - Vulnerability reported to vendor
  • 2021-12-08 - Coordinated public release of advisory
CREDIT Mat Powell of Trend Micro Zero Day Initiative
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