Horizon Alert
Summary of the vulnerability and why it matters
This advisory concerns a critical security vulnerability found in Everest Forms, a plugin used for creating web forms. The vulnerability, an unauthenticated PHP Object Injection, could allow unauthorized actors to remotely compromise systems by exploiting how the plugin processes data. The main concern is confirming relevance and exposure to your digital assets.
- Allows remote system compromise without authentication.
- Widely exposed due to public-facing web form usage.
- Confirm if this plugin is in use within your environment.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability by sending specially crafted data to a website that uses a vulnerable version of Everest Forms. Since no authentication is required, this could be done from anywhere on the internet. If the attacker successfully injects a malicious PHP object, it could lead to complete compromise of the website.
- No authentication required.
- Involves specially crafted data.
- Can lead to complete website compromise.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an unauthenticated attacker to inject malicious code when users interact with web forms, potentially leading to the compromise of website data and service behavior. This risk is realized when an administrator views form submissions containing the malicious input.
- Website data and service behavior at risk.
- Exposure via form submissions viewed by admins.
- Potential data manipulation or disruption.
Operational Fix
Recommended remediation, mitigation, and detection steps
This unauthenticated PHP object injection vulnerability in Everest Forms affects public-facing web forms, making them a common internet exposure. Initial triage should focus on identifying all instances of the affected plugin, confirming their reachability and business criticality, and assigning ownership to the appropriate team, likely application or platform owners, to plan remediation based on risk.
- Application or platform owners should own.
- Verify external reachability and business criticality first.
- Plan remediation based on confirmed risk.
