CVE-2021-21038 : Security Advisory and Response

Acrobat Reader DC versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier), and 2017.011.30188 (and earlier) are impacted by an Out-of-Bounds Write vulnerability, potentially leading to arbitrary code execution. This article provides insights into the vulnerability, its impacts, technical details, and mitigation strategies.

Understanding CVE-2021-21038

This section delves into the details of the vulnerability and its potential consequences.

What is CVE-2021-21038?

Acrobat Reader DC versions are susceptible to an Out-Of-Bounds Write vulnerability. Unauthorized attackers could exploit this flaw to execute arbitrary code within the user's context, requiring user interaction to open a malicious file.

The Impact of CVE-2021-21038

With a CVSS base score of 7.8, this vulnerability has a high severity level. It can lead to critical consequences such as high confidentiality, integrity, and availability impact without the need for user privileges.

Technical Details of CVE-2021-21038

This section explores the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability occurs when parsing a crafted jpeg file, resulting in an Out-Of-Bounds Write condition that allows attackers to execute arbitrary code.

Affected Systems and Versions

Adobe Acrobat Reader DC versions 2020.013.20074, 2020.001.30018, and 2017.011.30188 (and earlier) are confirmed to be affected.

Exploitation Mechanism

Exploitation of this vulnerability demands user interaction as the victim needs to open the compromised file.

Mitigation and Prevention

This section outlines the necessary actions to mitigate the risks posed by CVE-2021-21038.

Immediate Steps to Take

Users are advised to update Adobe Acrobat Reader DC to the latest version available to eliminate the vulnerability's presence.

Long-Term Security Practices

Implement security best practices such as avoiding opening files from unknown or untrusted sources to prevent similar vulnerabilities.

Patching and Updates

Regularly check for updates and security patches provided by Adobe to ensure systems are protected against potential threats.