CVE-2021-40789 : Exploit Details and Defense Strategies

Adobe Premiere Elements 20210809.daily.2242976 (and earlier) is affected by a Null pointer dereference vulnerability, which could lead to an application denial-of-service. This article provides details on the impact, technical aspects, and mitigation of the CVE.

Understanding CVE-2021-40789

Adobe Premiere Elements faces a critical vulnerability that can result in a denial-of-service attack. It is important to understand the nature and implications of this CVE.

What is CVE-2021-40789?

Adobe Premiere Elements version 20210809.daily.2242976 and earlier are susceptible to a Null pointer dereference vulnerability when parsing a malicious file.
An unauthenticated attacker can exploit this flaw to cause a denial-of-service within the user's context by tricking them into opening a specially crafted file.

The Impact of CVE-2021-40789

CVSS Base Score: 5.5 (Medium)
Attack Vector: Local
Attack Complexity: Low
User Interaction: Required
Availability Impact: High
The vulnerability does not impact confidentiality or integrity but can lead to an application denial-of-service.

Technical Details of CVE-2021-40789

Understanding the vulnerability, affected systems, and the exploitation mechanism is crucial for effective mitigation.

Vulnerability Description

Vulnerability Type: NULL Pointer Dereference (CWE-476)
The flaw arises when processing a specially crafted file, resulting in a Null pointer dereference.

Affected Systems and Versions

Affected Product: Adobe Premiere Elements
Vendor: Adobe
Affected Versions:
Adobe Premiere Elements 20210809.daily.2242976 (and earlier)

Exploitation Mechanism

Exploitation requires an unauthenticated attacker to lure a victim into opening a malicious file, triggering the Null pointer dereference vulnerability.

Mitigation and Prevention

Taking immediate steps and incorporating long-term security practices can help prevent exploitation and ensure system integrity.

Immediate Steps to Take

Update: Apply the latest security patches provided by Adobe to address the vulnerability.
Exercise Caution: Avoid opening files from untrusted or unknown sources.

Long-Term Security Practices

User Awareness: Educate users on safe file handling practices and the risks associated with opening files from unfamiliar sources.
Regular Updates: Maintain a routine of installing software updates and patches to close security gaps.

Patching and Updates

Adobe has released a security update to mitigate the vulnerability - users are urged to update their Premiere Elements software promptly.