CVE-2019-20354 : Exploit Details and Defense Strategies

An authenticated low-privilege user can exploit a vulnerability in the web application component of piSignage prior to version 2.6.4, allowing remote file download via path traversal.

Understanding CVE-2019-20354

This CVE describes a security vulnerability in piSignage that enables unauthorized file access.

What is CVE-2019-20354?

The vulnerability in piSignage's web application component allows a low-privilege authenticated user to download files from a Raspberry Pi using a path traversal technique.

The Impact of CVE-2019-20354

The vulnerability permits unauthorized access to sensitive files on the Raspberry Pi, compromising data confidentiality and integrity.

Technical Details of CVE-2019-20354

This section provides in-depth technical insights into the CVE.

Vulnerability Description

An authenticated low-privilege user can exploit the piSignage vulnerability to download files from the Raspberry Pi through the player API for log download.

Affected Systems and Versions

Vulnerable versions: piSignage versions prior to 2.6.4

Exploitation Mechanism

The vulnerability is exploited by manipulating the 'api/settings/log?file=../' endpoint to traverse directories and access files.

Mitigation and Prevention

Protect your systems from CVE-2019-20354 with these security measures.

Immediate Steps to Take

Upgrade piSignage to version 2.6.4 or newer to mitigate the vulnerability.
Restrict access to the affected endpoint to authorized users only.

Long-Term Security Practices

Regularly monitor and audit file access and downloads on the Raspberry Pi.
Implement least privilege access controls to limit user capabilities.

Patching and Updates

Stay informed about security updates and patches for piSignage to address vulnerabilities promptly.