Horizon Alert
Summary of the vulnerability and why it matters
When specific code pages are used on Windows systems with Apache and PHP-CGI, a vulnerability exists that can allow malicious actors to pass unintended commands to the PHP binary. This misinterpretation of characters can lead to the exposure of source code or the execution of arbitrary code on the server. The impact could affect organizations running vulnerable PHP versions on Windows with this specific configuration.
- PHP CGI on Windows
- Character misinterpretation allows commands
- Source code exposure, arbitrary code execution
Attack Path
How an attacker could exploit the issue
The vulnerability affects PHP versions when used with Apache and PHP-CGI on Windows. Under specific code page configurations, Windows may misinterpret characters in commands sent to PHP CGI. This misinterpretation allows an attacker to inject malicious options into the PHP binary.
- Exposure on Windows servers.
- Attacker sends crafted request.
- PHP misinterprets characters, executes commands.
Live Threat
Current exploitation, exposure, and threat context
The identified vulnerability presents a critical risk due to its potential for exploitation without requiring special privileges or user interaction. This could allow attackers to execute arbitrary code, leading to the exposure of sensitive source code and full server compromise. The vulnerability is particularly concerning for organizations using PHP in CGI mode on Windows systems.
- Attackers with low skill.
- No access or conditions needed.
- High business risk and urgency.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
A critical vulnerability in PHP on Windows, when utilized with Apache and PHP-CGI, presents a significant risk. This flaw allows unauthorized users to execute arbitrary code, potentially leading to the exposure of script source code and other severe compromises. Affected organizations should take immediate action to identify and mitigate this threat to protect their systems and data.
- Locate exposed PHP assets.
- Reduce exposure or isolate risk.
- Apply fixes, verify, and monitor.
