CVE-2021-34871 Explained : Impact and Mitigation

This CVE-2021-34871 involves a vulnerability that allows remote attackers to execute arbitrary code on affected installations of Bentley View 10.15.0.75. The issue requires user interaction where the target must visit a malicious page or open a malicious file. The vulnerability stems from improper validation of user-supplied data in BMP file parsing, leading to a heap-based buffer overflow. By exploiting this flaw, an attacker could run code within the current process.

Understanding CVE-2021-34871

This section delves into the specifics of the CVE-2021-34871 vulnerability.

What is CVE-2021-34871?

CVE-2021-34871 allows remote attackers to execute arbitrary code on affected Bentley View 10.15.0.75 installations. User interaction is necessary, making it crucial for targets to avoid visiting suspicious pages or opening malicious files. The vulnerability arises from inadequate validation in BMP file parsing.

The Impact of CVE-2021-34871

With a CVSS base score of 7.8, this vulnerability has a significant impact. It can lead to high confidentiality, integrity, and availability impacts, making it critical for affected systems to address this issue promptly.

Technical Details of CVE-2021-34871

This section covers the technical aspects of CVE-2021-34871.

Vulnerability Description

The vulnerability is classified as a CWE-122: Heap-based Buffer Overflow. It arises from the flawed validation of user-supplied data's length before copying it to a heap-based buffer in BMP file parsing.

Affected Systems and Versions

Bentley View version 10.15.0.75 is impacted by this vulnerability.

Exploitation Mechanism

Remote attackers can exploit this vulnerability by enticing targets to interact with malicious pages or files, triggering the improper data validation in BMP file parsing.

Mitigation and Prevention

In this section, we discuss how to mitigate and prevent CVE-2021-34871.

Immediate Steps to Take

Users should refrain from interacting with suspicious files, pages, or links to prevent exploitation. It is crucial to exercise caution while browsing to avoid falling prey to this vulnerability.

Long-Term Security Practices

Employing robust cybersecurity practices, such as keeping software up to date, implementing intrusion detection systems, and conducting regular security assessments, can enhance overall defense against such vulnerabilities.

Patching and Updates

Ensure that Bentley View installations are updated with the latest patches and security fixes to mitigate the CVE-2021-34871 vulnerability effectively.