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
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 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 |
| 2021-12-07 | First version of this advisory |
| 2022-02-04 | Adding new CVE numbers provided by ZDI |
