PT-2021-20748 · Bentley · Bentley View

Mat Powell · Published 2021-12-08 · Updated 2022-01-14 · CVE-2021-34904

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Bentley View version 10.15.0.75

Description: This issue allows remote attackers to execute arbitrary code on affected installations. User interaction is required, where the target must visit a malicious page or open a malicious file. The flaw exists within the parsing of DGN files due to the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this to execute code in the context of the current process.

Recommendations: For Bentley View version 10.15.0.75, update to a version that fixes the heap-based buffer overflow issue in DGN file parsing to prevent remote code execution. As a temporary workaround, consider restricting the opening of DGN files from untrusted sources to minimize the risk of exploitation.

Fix

Heap Based Buffer Overflow

Memory Corruption

Weakness Enumeration

CWE-122

CWE-787

Related Identifiers

CVE-2021-34904

ZDI-21-1493

Affected Products

Bentley View

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-34904 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-21-1493 · Security Note
• https://bentley.com/en/common-vulnerability-exposure/BE-2021-0009 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34904 · Vendor Advisory
• https://t.me/cibsecurity/35454 · Telegram Post