CVE-2021-34840 : What You Need to Know
Learn about CVE-2021-34840, a critical vulnerability in Foxit PDF Reader 11.0.0.49893 allowing remote attackers to execute arbitrary code. Find out the impact, technical details, and mitigation steps.
This CVE-2021-34840 article discusses a critical vulnerability found in Foxit PDF Reader version 11.0.0.49893 that allows remote attackers to execute arbitrary code. User interaction is required for exploitation, where the target must visit a malicious page or open a malicious file.
Understanding CVE-2021-34840
This section delves into the specifics of the CVE-2021-34840 vulnerability.
What is CVE-2021-34840?
The vulnerability in Foxit PDF Reader 11.0.0.49893 allows remote attackers to run arbitrary code by exploiting a flaw in the handling of Annotation objects. The issue arises from the lack of validation of object existence before operations, enabling attackers to execute code in the current process.
The Impact of CVE-2021-34840
The impact is severe as it permits remote attackers to execute malicious code on affected systems. The vulnerability's high Confidentiality, Integrity, and Availability impacts make it a critical security concern.
Technical Details of CVE-2021-34840
This section provides detailed technical insights into CVE-2021-34840.
Vulnerability Description
The vulnerability stems from a Use After Free flaw in the handling of Annotation objects within Foxit PDF Reader. Attackers can exploit this to execute arbitrary code in the context of the current process.
Affected Systems and Versions
Foxit PDF Reader version 11.0.0.49893 is specifically impacted by this vulnerability.
Exploitation Mechanism
To exploit this vulnerability, attackers need users to visit a malicious page or open a malicious file, enabling the execution of arbitrary code.
Mitigation and Prevention
In light of the CVE-2021-34840 vulnerability, it is crucial to implement effective security measures.
Immediate Steps to Take
Users should refrain from visiting suspicious websites or opening files from untrusted sources to prevent exploitation of the vulnerability.
Long-Term Security Practices
Implementing robust cybersecurity practices, such as keeping software up-to-date, using security tools, and educating users on safe browsing habits, is essential for long-term security.
Patching and Updates
Users are advised to promptly install patches and updates provided by Foxit for PDF Reader to mitigate the vulnerability and enhance system security.