CVE-2021-21773 : Security Advisory and Response

An out-of-bounds write vulnerability has been identified in Accusoft ImageGear 19.8, specifically in the TIFF header count-processing functionality. This vulnerability can be exploited by a specially crafted malformed file, potentially leading to memory corruption. Attackers can leverage this flaw by providing a malicious file.

Understanding CVE-2021-21773

This section delves into the specifics of the CVE-2021-21773 vulnerability.

What is CVE-2021-21773?

CVE-2021-21773 is an out-of-bounds write vulnerability located in the TIFF header count-processing feature of Accusoft ImageGear 19.8. It arises due to improper handling of specially crafted files, resulting in memory corruption.

The Impact of CVE-2021-21773

With a CVSS base score of 8.1, CVE-2021-21773 poses a significant threat. The high severity rating is attributed to its potential for confidentiality, integrity, and availability impact. Notably, the vulnerability does not require any special privileges for exploitation.

Technical Details of CVE-2021-21773

This section provides a deeper insight into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability involves an out-of-bounds write issue within the TIFF header count-processing function of Accusoft ImageGear 19.8, enabling attackers to corrupt memory by providing a manipulated file.

Affected Systems and Versions

Accusoft ImageGear 19.8 is the specific version affected by this vulnerability. Users utilizing this version are at risk of exploitation.

Exploitation Mechanism

Exploiting this vulnerability requires an attacker to create a specially crafted malformed file and entice the target into opening it. Once executed, the malicious file triggers the out-of-bounds write issue, potentially leading to memory corruption.

Mitigation and Prevention

In light of CVE-2021-21773, it is crucial for users and organizations to implement appropriate security measures to mitigate the risks associated with this vulnerability.

Immediate Steps to Take

To address this vulnerability, users are advised to update Accusoft ImageGear to a patched version that resolves the out-of-bounds write issue. Additionally, exercise caution when handling files from unknown or untrusted sources.

Long-Term Security Practices

Establishing robust security practices, including regular software updates, security monitoring, and user awareness training, can bolster defenses against similar vulnerabilities in the future.

Patching and Updates

Vendor-supplied patches should be promptly applied to secure systems and prevent exploitation of CVE-2021-21773.