PT-2021-20736 · Bentley · Bentley View

Mat Powell · Published 2021-12-08 · Updated 2022-01-14 · CVE-2021-34892

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 JT files due to the lack of proper validation of the length of user-supplied data prior to copying it to a stack-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, as a temporary workaround, consider disabling the parsing of JT files until a patch is available. Restrict access to the JT file parsing module to minimize the risk of exploitation. Avoid using user-supplied data in the affected parsing function until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

Stack Overflow

Weakness Enumeration

CWE-787

CWE-121

Related Identifiers

CVE-2021-34892

ZDI-21-1481

Affected Products

Bentley View

References · 5

• https://bentley.com/en/common-vulnerability-exposure/BE-2021-0005 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-21-1481 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-34892 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34892 · Vendor Advisory
• https://t.me/cibsecurity/35447 · Telegram Post