CVE-2021-21833 : Security Advisory and Response

This CVE-2021-21833 article provides an in-depth analysis of an improper array index validation vulnerability found in Accusoft ImageGear 19.9, impacting confidentiality, integrity, and availability.

Understanding CVE-2021-21833

This section delves into the details regarding the vulnerability, its impacts, affected systems, and ways to mitigate and prevent exploitation.

What is CVE-2021-21833?

An improper array index validation vulnerability exists in the TIF IP_planar_raster_unpack functionality of Accusoft ImageGear 19.9. A specially crafted malformed file can lead to an out-of-bounds write. Attackers can provide a malicious file to exploit this vulnerability.

The Impact of CVE-2021-21833

With a CVSS base score of 9.8, this critical vulnerability has a high impact on confidentiality, integrity, and availability. Attackers can exploit it remotely without requiring privileges, potentially causing severe damage.

Technical Details of CVE-2021-21833

This section dives deeper into the technical aspects of the vulnerability, detailing its description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from improper array index validation in the TIF IP_planar_raster_unpack functionality of Accusoft ImageGear 19.9, enabling attackers to execute out-of-bounds writes through specially crafted files.

Affected Systems and Versions

Accusoft ImageGear 19.9 is confirmed to be affected by this vulnerability. Other versions may also be impacted, necessitating thorough security assessments.

Exploitation Mechanism

By providing a malicious file to the system, attackers can exploit this vulnerability remotely, potentially causing significant harm to data and system availability.

Mitigation and Prevention

This section outlines essential steps to mitigate the risks associated with CVE-2021-21833, ensuring system security and resilience against potential attacks.

Immediate Steps to Take

Immediately update Accusoft ImageGear to a patched version, validate file inputs for proper formatting, and implement robust network security measures to prevent unauthorized access.

Long-Term Security Practices

Regularly update software, perform security audits, educate users on safe file handling practices, and maintain a proactive security posture to mitigate future vulnerabilities.

Patching and Updates

Stay informed about security updates from Accusoft, promptly apply patches, and monitor security channels for any emerging threats related to Accusoft ImageGear.