BE-2021-0011: Use-after-free vulnerabilities in MicroStation and MicroStation-based applications

Bentley ID: BE-2021-0011
CVE ID: CVE-2021-46613, CVE-2021-46627
Severity: 7.8 (High)
CVSS v3.1: AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Publication date: 7th December 2021
Revision date: 4th February 2022


Description

Summary: 

MicroStation and MicroStation-based applications may be affected by a use-after-free vulnerabilities when opening maliciously crafted DXF files. Exploiting these vulnerabilities could lead to code execution.

Details: 

The following vulnerabilities related to this advisory was discovered by TrendMicro ZDI: ZDI-CAN-15407, ZDI-CAN-15457.

Using an affected version of MicroStation or MicroStation-based application to open a DXF file containing maliciously crafted data can trigger use-after-free vulnerabilities. Exploitation of these vulnerabilities within the parsing of DXF files could enable an attacker to execute arbitrary code in the context of the current process. 

 

Affected Versions:


Applications Affected Versions Mitigated Versions
MicroStation Versions prior to 10.16.02.* 10.16.02.* and more recent
Bentley View Versions prior to 10.16.02.* 10.16.02.* and more recent

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 DXF files coming from trusted sources.


Acknowledgement

 Thanks to Mat Powell of Trend Micro Zero Day Initiative for discovering these vulnerabilities.
 

Revision History

Date Description
7th December 2021 First version of the advisory
4th February 2022 Adding the CVE numbers provided by ZDI