Bentley ID: BE-2021-0003
CVE ID: CVE-2021-34873, CVE-2021-34887, CVE-2021-46599, CVE-2021-46609, CVE-2021-46612, CVE-2021-46619, CVE-2021-46633
Severity: 7.8
CVSS v3.1: AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Publication date: 2021-12-07
Revision date: 2021-12-07

Summary
MicroStation and MicroStation-based applications may be affected by out-of-bounds or use-after-free vulnerabilities when opening maliciously crafted PDF files. Exploiting these vulnerabilities could lead to code execution.

Details
The following vulnerabilities related to this advisory were discovered by TrendMicro ZDI: ZDI-CAN-14696, ZDI-CAN-14840, ZDI-CAN-15393, ZDI-CAN-15403, ZDI-CAN-15406, ZDI-CAN-15413, ZDI-CAN-15463. Using an affected version of MicroStation or MicroStation-based application to open a PDF file containing maliciously crafted data can trigger an out-of-bounds or use-after-free vulnerability. Exploitation of these vulnerabilities within the parsing of PDF files could enable an attacker to execute arbitrary code in the context of the current process.

Affected Versions

Recommended Mitigations
Bentley recommends updating to the latest versions of MicroStation and MicroStation-based applications. As a general best practice, it is also recommended to only open PDF files coming from trusted sources.

Acknowledgement
Thanks to Francis Provencher {PRL} for discovering ZDI-CAN-14696. Thanks to Mat Powell of Trend Micro Zero Day Initiative for discovering the rest of the vulnerabilities related to this advisory

Revision History