Bentley ID: BE-2021-0014
CVE ID: CVE-2021-34872
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 vulnerability when opening maliciously crafted SKP files. Exploiting this vulnerability could lead to code execution.

Details
The following vulnerability related to this advisory was discovered by TrendMicro ZDI: ZDI-CAN-14737. Using an affected version of MicroStation or MicroStation-based application to open a SKP file containing maliciously crafted data can trigger a use-after-free vulnerability. Exploitation of this vulnerability within the parsing of SKP 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 SKP files coming from trusted sources.

Acknowledgement
Thanks to Francis Provencher {PRL} for discovering this vulnerability.

Revision History