CVE-2019-13343 : Security Advisory and Response

A pre-authentication arbitrary file download vulnerability has been detected in versions of Butor Portal prior to 1.0.27. This vulnerability allows a remote anonymous user to download any file on servers running Butor Portal. The specific vulnerability lies within the WhiteLabelingServlet, which fails to properly sanitize user input in the "theme t" parameter before using it in a path. Consequently, an unverified path is utilized to retrieve a file and deliver its raw content to the user through the "/wl?t=../../...&h=" substring followed by a filename.

Understanding CVE-2019-13343

This section provides an overview of the CVE-2019-13343 vulnerability.

What is CVE-2019-13343?

CVE-2019-13343 is a Path Traversal vulnerability in Butor Portal before version 1.0.27 that leads to a pre-authentication arbitrary file download. It allows a remote anonymous user to download any file on servers running Butor Portal by exploiting the WhiteLabelingServlet.

The Impact of CVE-2019-13343

The impact of CVE-2019-13343 is critical with a CVSS base score of 9.9. The vulnerability has the following impacts:

Confidentiality Impact: High
Integrity Impact: Low
Availability Impact: Low
Privileges Required: None
User Interaction: None
Scope: Changed
Attack Vector: Network
Attack Complexity: Low

Technical Details of CVE-2019-13343

This section delves into the technical aspects of CVE-2019-13343.

Vulnerability Description

The vulnerability in CVE-2019-13343 arises from the WhiteLabelingServlet's failure to properly sanitize user input in the "theme t" parameter before using it in a path, allowing unauthorized file downloads.

Affected Systems and Versions

Affected System: Butor Portal
Affected Versions: Prior to 1.0.27

Exploitation Mechanism

The vulnerability is exploited by manipulating the "theme t" parameter in the path, enabling the retrieval of arbitrary files from the server.

Mitigation and Prevention

This section outlines steps to mitigate and prevent exploitation of CVE-2019-13343.

Immediate Steps to Take

Update Butor Portal to version 1.0.27 or later to patch the vulnerability.
Monitor server logs for any suspicious file download activities.
Implement network-level controls to restrict access to sensitive files.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify vulnerabilities.
Educate users on safe file handling practices to prevent unauthorized downloads.

Patching and Updates

Regularly apply security patches and updates to Butor Portal to address known vulnerabilities.