CVE-2021-21939 : Exploit Details and Defense Strategies

A heap-based buffer overflow vulnerability in Accusoft ImageGear 19.10 allows an attacker to execute code by manipulating a specially-crafted file.

Understanding CVE-2021-21939

This CVE involves a critical heap-based buffer overflow vulnerability in the XWD parser functionality of Accusoft ImageGear 19.10.

What is CVE-2021-21939?

CVE-2021-21939 is a heap-based buffer overflow vulnerability that exists in Accusoft ImageGear 19.10. An attacker can exploit this flaw by providing a malicious file, leading to potential code execution.

The Impact of CVE-2021-21939

With a CVSS base score of 9.8, this vulnerability has a critical severity level. It can result in high impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-21939

This section dives into the technical aspects of the CVE, including vulnerability description, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerability stems from a heap-based buffer overflow in the XWD parser functionality of Accusoft ImageGear 19.10, triggered by a specially-crafted file.

Affected Systems and Versions

Only systems running Accusoft ImageGear 19.10 are vulnerable to this exploit.

Exploitation Mechanism

An attacker can craft a malicious file and provide it to a target system, exploiting the vulnerability to execute arbitrary code.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21939, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Apply vendor-supplied patches or updates to address the vulnerability promptly.
Implement network security measures to detect and block malicious file uploads.

Long-Term Security Practices

Regularly update and patch software to ensure vulnerabilities are addressed in a timely manner.
Conduct security assessments and penetration testing to proactively identify and remediate potential security gaps.

Patching and Updates

Accusoft may release patches or updates to fix the vulnerability. It is highly recommended to apply these patches as soon as they are available to secure your systems from potential attacks.