CVE-2021-21944 : Exploit Details and Defense Strategies

Accusoft ImageGear 19.10 is impacted by two heap-based buffer overflow vulnerabilities in the TIFF parser functionality. An attacker can exploit these vulnerabilities by providing a specially-crafted file, leading to a heap buffer overflow.

Understanding CVE-2021-21944

This CVE involves heap-based buffer overflow vulnerabilities in Accusoft ImageGear 19.10, posing a critical threat to affected systems.

What is CVE-2021-21944?

The vulnerabilities allow an attacker to trigger a heap buffer overflow by manipulating a crafted file, potentially enabling remote code execution.

The Impact of CVE-2021-21944

With a CVSS base score of 9.8 (Critical), the vulnerabilities have a significant impact on the confidentiality, integrity, and availability of systems running the affected version.

Technical Details of CVE-2021-21944

The technical details shed light on the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The heap-based buffer overflow vulnerabilities are triggered within the TIFF parser functionality of Accusoft ImageGear 19.10, exploiting a flaw related to copying the first 12 bits from a local variable.

Affected Systems and Versions

Accusoft ImageGear 19.10 is confirmed to be affected by these vulnerabilities, making systems running this version susceptible to exploitation.

Exploitation Mechanism

By providing a malicious file to the vulnerable system, an attacker can execute arbitrary code and potentially gain control over the targeted system.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are essential to mitigate the risks posed by CVE-2021-21944.

Immediate Steps to Take

Disable the affected functionality or restrict access to the vulnerable component.
Regularly update security patches and monitor for any suspicious file uploads.

Long-Term Security Practices

Employ network segmentation to contain potential attacks.
Conduct regular security training for employees to enhance awareness of file-based vulnerabilities.

Patching and Updates

Apply the latest patches released by Accusoft to address and remediate the heap-based buffer overflow vulnerabilities in ImageGear 19.10.