Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability has been identified in the Piwigo installer that could allow an unauthenticated attacker to execute arbitrary PHP code. This occurs because the installer improperly handles database configuration parameters, writing them directly into a PHP configuration file without adequate sanitization, especially on newer PHP versions. The potential for code injection means that if our organization uses this software, it could be a target for significant compromise.
- Code execution risk in Piwigo installer.
- Affects web applications, commonly exposed externally.
- Confirm relevance and potential exposure.
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker can compromise a Piwigo installation by sending specially crafted POST requests to the installer. These requests can inject malicious PHP code into the application's database configuration file, which is then executed when any page on the site is accessed, potentially leading to full system compromise.
- No authentication required.
- Installer accepts malicious POST parameters.
- Arbitrary PHP code execution.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an unauthenticated attacker to execute arbitrary PHP code on a Piwigo installation when it runs on PHP 8+. This occurs because installer database configuration parameters are written directly into a PHP configuration file without sufficient sanitization, bypassing existing protections and enabling code injection.
- Arbitrary PHP code execution on the server.
- Exploitation via malicious POST parameters.
- Compromise of the Piwigo application.
Operational Fix
Recommended remediation, mitigation, and detection steps
The Piwigo installer's vulnerability requires intervention from teams responsible for the application and its underlying infrastructure. The first practical step is to locate all Piwigo installations, assess their accessibility and business criticality, and identify the accountable application owner. Subsequent remediation planning should be risk-based, considering factors like exposure and maintenance windows.
- Application owners should manage remediation.
- Verify Piwigo installation reachability.
- Plan maintenance for risk-based fixes.
