CVE-2021-23180 : What You Need to Know

A flaw was discovered in htmldoc version 1.9.12 and earlier that could result in a null pointer dereference in the file_extension() function in file.c. This vulnerability may allow attackers to execute arbitrary code and cause a denial of service.

Understanding CVE-2021-23180

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-23180.

What is CVE-2021-23180?

The CVE-2021-23180 vulnerability affects htmldoc versions up to 1.9.12. It is classified under CWE-476 for NULL Pointer Dereference and CWE-400 for Uncontrolled Resource Consumption.

The Impact of CVE-2021-23180

Exploitation of this vulnerability could lead to the execution of arbitrary code and denial of service attacks on systems running the affected versions of htmldoc.

Technical Details of CVE-2021-23180

Below are the specific technical aspects associated with CVE-2021-23180.

Vulnerability Description

The flaw in htmldoc versions up to 1.9.12 allows for a null pointer dereference in the file_extension() function, providing an opportunity for attackers to execute unauthorized code and disrupt services.

Affected Systems and Versions

This vulnerability impacts htmldoc versions prior to 1.9.12, leaving systems running these versions exposed to potential exploitation.

Exploitation Mechanism

By exploiting the null pointer dereference in the file_extension() function within the file.c code, threat actors can trigger the execution of malicious code and potentially disrupt system operations.

Mitigation and Prevention

Protecting systems from CVE-2021-23180 requires immediate action and long-term security practices.

Immediate Steps to Take

Users are advised to update htmldoc to version 1.9.12 or above to mitigate the vulnerability. Additionally, monitoring system logs for any unusual activities can help detect potential exploitation attempts.

Long-Term Security Practices

Implementing security measures such as regular software updates, vulnerability assessments, and access controls can enhance the overall security posture of the system.

Patching and Updates

Maintaining an up-to-date patch management strategy is crucial to addressing known vulnerabilities like CVE-2021-23180 and ensuring the security of htmldoc installations.