Horizon Alert
Summary of the vulnerability and why it matters
This advisory concerns a critical vulnerability in a language system that allows unauthenticated attackers to execute arbitrary commands on the server by manipulating a parameter in a web script. The issue stems from the system's failure to properly sanitize input before using it in a server-side command execution function, posing a significant risk if the affected component is exposed.
- Attackers can run commands on the server.
- Unauthenticated access amplifies potential impact.
- Confirm relevance and scope of affected systems.
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker can send a crafted request to the `subtitles.php` script, exploiting a direct use of the `id` parameter in a PHP `exec()` command. By appending shell metacharacters to this parameter, an attacker can achieve arbitrary operating system command execution on the server.
- No authentication needed.
- Inject shell metacharacters into `id`.
- Execute arbitrary commands on the server.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an unauthenticated remote attacker to execute arbitrary operating system commands on the server when the `id` parameter is supplied to `subtitles.php`.
- Server OS commands
- Unsanitized `id` parameter
- Arbitrary code execution
Operational Fix
Recommended remediation, mitigation, and detection steps
Given the vulnerability in `subtitles.php` of the Guardian language-system, the application owners are primarily responsible for addressing this command injection flaw. The first practical step involves identifying all instances of this system, determining their exposure to the internet, confirming business criticality, and then engaging with the appropriate teams to plan remediation activities.
- Application owners should manage the fix.
- Verify internet exposure and asset criticality.
- Plan remediation based on risk and vendor coordination.
