CVE-2021-39831 Explained : Impact and Mitigation

Adobe Framemaker versions 2019 Update 8 and 2020 Release Update 2 are affected by an out-of-bounds write vulnerability that could lead to arbitrary code execution.

Understanding CVE-2021-39831

Adobe Framemaker is susceptible to a critical security flaw that allows an attacker to execute arbitrary code by exploiting a PDF file.

What is CVE-2021-39831?

Adobe Framemaker versions 2019 Update 8 and 2020 Release Update 2 are impacted by an out-of-bounds write vulnerability.
The vulnerability can result in arbitrary code execution under the current user's context.

The Impact of CVE-2021-39831

CVSS Base Score: 7.8 (High)
Attack Vector: Local
User Interaction: Required
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2021-39831

Adobe Framemaker's CVE-2021-39831 vulnerability is detailed as follows:

Vulnerability Description

The vulnerability is classified as an Out-of-bounds Write (CWE-787).
It allows an attacker to perform a remote code execution due to improper PDF file parsing.

Affected Systems and Versions

Product: FrameMaker
Vendor: Adobe
Affected Versions:
FrameMaker 2020.2 and earlier
FrameMaker 2019.8 and earlier
Versions with unspecified releases

Exploitation Mechanism

Exploitation requires user interaction, where a victim must open a malicious PDF file to trigger the vulnerability.

Mitigation and Prevention

After understanding the impact and technical details, here are the steps recommended for mitigation:

Immediate Steps to Take

Install security updates provided by Adobe promptly.
Avoid opening PDF files from untrusted sources.
Implement email and web filtering to block malicious PDF files.

Long-Term Security Practices

Regularly update Adobe Framemaker to the latest secure version.
Educate users on safe browsing habits and the dangers of opening unverified files.
Implement network segmentation and access controls to contain potential attacks.

Patching and Updates

Adobe has released security updates to address the CVE-2021-39831 vulnerability.
Ensure all systems running affected versions of Adobe Framemaker are updated with the latest patches.