CVE-2021-39834 : Exploit Details and Defense Strategies

Adobe FrameMaker versions 2019 Update 8 and 2020 Release Update 2 are affected by an out-of-bounds read vulnerability. This vulnerability could allow attackers to access sensitive memory by exploiting a malicious TIF file. The vulnerability may lead to the bypassing of mitigations like ASLR.

Understanding CVE-2021-39834

Adobe FrameMaker TIF File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

What is CVE-2021-39834?

CVE-2021-39834 is a vulnerability impacting Adobe FrameMaker versions 2019 Update 8 and 2020 Release Update 2, allowing for out-of-bounds read exploitation via malicious TIF files.

The Impact of CVE-2021-39834

The vulnerability has a CVSS base score of 3.3 (Low severity) with a requirement of user interaction to exploit. It could lead to disclosure of sensitive memory, bypassing ASLR mitigations.

Technical Details of CVE-2021-39834

Adobe FrameMaker TIF File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

Vulnerability Description

Affected Versions: FrameMaker 2019 Update 8 and FrameMaker 2020 Release Update 2
Type: Out-of-bounds read vulnerability
Exploitation: Requires user interaction with a malicious TIF file

Affected Systems and Versions

Products: FrameMaker
Vendor: Adobe
Affected Versions:
FrameMaker 2020.2 and lower
FrameMaker 2019.8 and lower

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Local
User Interaction: Required
Privileges Required: None

Mitigation and Prevention

Adobe recommends the following measures to mitigate the CVE-2021-39834 vulnerability:

Immediate Steps to Take

Update Adobe FrameMaker to the latest version
Avoid opening TIF files from untrusted sources

Long-Term Security Practices

Conduct regular security trainings to educate users about file security
Implement email and web filtering to block malicious TIF files

Patching and Updates

Apply security patches and updates provided by Adobe for FrameMaker