CVE-2021-39858 : Security Advisory and Response

Adobe Acrobat Pro DC is affected by an out-of-bounds read vulnerability that could lead to disclosure of arbitrary memory information. Users need to be cautious when opening files to prevent exploitation.

Understanding CVE-2021-39858

Adobe Acrobat Pro DC has a vulnerability that can result in the disclosure of sensitive information if exploited.

What is CVE-2021-39858?

The vulnerability in Adobe Acrobat Pro DC could allow an attacker to read beyond the bounds of a buffer, potentially accessing confidential memory information.

The Impact of CVE-2021-39858

If successfully exploited, the vulnerability could lead to the disclosure of arbitrary memory details within the current user's context, emphasizing the importance of prompt mitigation.

Technical Details of CVE-2021-39858

This section delves into the specifics of the vulnerability within Adobe Acrobat Pro DC.

Vulnerability Description

The vulnerability involves an out-of-bounds read issue present in versions 2021.005.20060 and prior, requiring user interaction through the opening of a malicious file.

Affected Systems and Versions

Affected Product: Acrobat Reader
Vendor: Adobe
Vulnerable Versions: DC 2021 July, 20.0-Classic 2021 July, 17.0-Classic 2021 July

Exploitation Mechanism

The exploitation of this vulnerability demands user interaction, where a victim unknowingly opens a crafted file, triggering the out-of-bounds read.

Mitigation and Prevention

Understanding the necessary steps to prevent and address the CVE is crucial.

Immediate Steps to Take

Exercise caution when opening files, especially from untrusted sources
Consider disabling the opening of PostScript files if not essential

Long-Term Security Practices

Regularly update Adobe Acrobat Reader to the latest version
Educate users on safe file handling practices to minimize potential risks

Patching and Updates

Adobe has provided security updates to address this vulnerability, ensure prompt installation to safeguard systems from exploitation.