CVE-2021-34891 Explained : Impact and Mitigation

This CVE-2021-34891 article provides details about a vulnerability affecting Bentley View version 10.15.0.75. Attackers can exploit this vulnerability to execute arbitrary code remotely by tricking users into visiting malicious websites or opening malicious files.

Understanding CVE-2021-34891

CVE-2021-34891 is a critical vulnerability identified in Bentley View version 10.15.0.75 that could allow remote attackers to execute arbitrary code on affected systems. The flaw lies in the parsing of JT files and can be triggered with user interaction.

What is CVE-2021-34891?

CVE-2021-34891 is a security vulnerability in Bentley View 10.15.0.75 that enables remote attackers to run code on the target system when a user interacts with a malicious webpage or file. The issue arises from inadequate validation of objects during operations, leading to code execution.

The Impact of CVE-2021-34891

The impact of CVE-2021-34891 is high, with a CVSS base score of 7.8. It requires no special privileges for exploitation, making it dangerous. Attackers can compromise confidentiality, integrity, and availability by exploiting this vulnerability.

Technical Details of CVE-2021-34891

CVE-2021-34891 falls under CWE-416: Use After Free vulnerability class. It has a low attack complexity and vector, requiring user interaction and posing a severe risk to affected systems. The vulnerability affects Bentley View version 10.15.0.75.

Vulnerability Description

The vulnerability in parsing JT files allows attackers to execute code on Bentley View 10.15.0.75 installations by exploiting user interaction with malicious content. This flaw stems from improper object validation, permitting code execution within the current process context.

Affected Systems and Versions

Bentley View version 10.15.0.75 is confirmed to be impacted by CVE-2021-34891. Users of this specific version are at risk of remote code execution if they interact with malicious web pages or files.

Exploitation Mechanism

Attackers can trigger the CVE-2021-34891 vulnerability by luring users to visit a crafted webpage or open a malicious file. Once user interaction occurs, the flaw in object validation allows the attacker to run arbitrary code within the system.

Mitigation and Prevention

To safeguard against CVE-2021-34891, immediate and long-term security measures are crucial.

Immediate Steps to Take

Users should avoid interacting with unknown or suspicious links, websites, or files. Organizations using Bentley View 10.15.0.75 must apply security patches promptly to mitigate the risk of code execution attacks.

Long-Term Security Practices

Implementing rigorous security awareness training for users and continuously monitoring for malicious activities can help prevent similar vulnerabilities. Regular security updates and patches are essential to maintain a secure environment.

Patching and Updates

Bentley users are advised to stay informed about security advisories and updates from the vendor. Applying recommended patches and keeping systems up to date with the latest security fixes is vital to protect against CVE-2021-34891.