CVE-2021-38563 : Security Advisory and Response

An issue was discovered in Foxit PDF Reader before 11.0.1 and PDF Editor before 11.0.1. It mishandles situations in which an array size is smaller than the maximum indirect object number, leading to a NULL pointer dereference, or out-of-bounds read or write.

Understanding CVE-2021-38563

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-38563.

What is CVE-2021-38563?

CVE-2021-38563 refers to a vulnerability in Foxit PDF Reader and PDF Editor that arises from mishandling array sizes, potentially enabling attackers to trigger null pointer dereferences or out-of-bounds read or write operations.

The Impact of CVE-2021-38563

Exploitation of this vulnerability could allow malicious actors to crash the application, disclose sensitive information, or execute arbitrary code on a targeted system, posing significant security risks to users.

Technical Details of CVE-2021-38563

Let's delve deeper into the description, affected systems, and exploitation mechanism of CVE-2021-38563 to understand the technical aspects.

Vulnerability Description

The vulnerability arises from improper handling of array sizes, leading to erroneous array access that can result in NULL pointer dereference or out-of-bounds read or write, creating opportunities for attackers to compromise the system.

Affected Systems and Versions

Foxit PDF Reader and PDF Editor versions before 11.0.1 are affected by this vulnerability, potentially impacting users relying on these software versions for PDF manipulation and editing.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious PDF file containing specially designed array size parameters to trigger the erroneous array access and invoke the desired outcomes.

Mitigation and Prevention

To safeguard systems from CVE-2021-38563, immediate actions coupled with long-term security practices and timely patching are crucial.

Immediate Steps to Take

Users are advised to update Foxit PDF Reader and PDF Editor to version 11.0.1 or later to mitigate the risks associated with this vulnerability effectively.

Long-Term Security Practices

Implementing secure coding practices, regularly updating software, and maintaining an efficient patch management system can fortify the defense against similar vulnerabilities in the future.

Patching and Updates

Stay informed about security advisories from Foxit Software and promptly apply patches and updates to ensure the protection of systems and sensitive information.