CVE-2020-27304 : Exploit Details and Defense Strategies

CivetWeb web library vulnerability allowing directory traversal.

Understanding CVE-2020-27304

The vulnerability in CivetWeb web library could lead to directory traversal attacks.

What is CVE-2020-27304?

The CivetWeb web library lacks validation for uploaded filepaths, enabling directory traversal on non-Windows OS when using the built-in HTTP form-based file upload mechanism.

The Impact of CVE-2020-27304

Web applications utilizing the file upload form handler and incorporating user-controlled filenames in the output path are at risk of directory traversal attacks.

Technical Details of CVE-2020-27304

The technical aspects of the vulnerability in CivetWeb web library.

Vulnerability Description

CivetWeb web library does not validate uploaded filepaths, allowing directory traversal.

Affected Systems and Versions

Product: CivetWeb
Vendor: civetweb_project
Affected Versions: 1.8
Unaffected Versions: 1.15

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating user-controlled filenames in the output path.

Mitigation and Prevention

Protecting systems from CVE-2020-27304.

Immediate Steps to Take

Update CivetWeb to version 1.15 or above to mitigate the vulnerability.
Avoid using user-controlled filenames in output paths.

Long-Term Security Practices

Implement input validation to prevent directory traversal attacks.
Regularly monitor and audit file upload functionalities for security vulnerabilities.

Patching and Updates

Stay informed about security updates and patches for CivetWeb to address known vulnerabilities.