Executive brief
ConfigServer Security & Firewall (CSF) is a popular Linux firewall and security management tool used to protect web servers from unauthorized access and attacks. A flaw in how the software processes request URLs allows unauthenticated attackers to inject and execute arbitrary shell commands with the privileges of the CSF service account, potentially leading to full server compromise.
Technical details
The vulnerability stems from improper escaping of request URL parameters in ConfigServer Security & Firewall, leading to a shell command injection flaw. An unauthenticated remote attacker can exploit this by crafting a malicious request URL containing shell metacharacters that bypass input validation and execute arbitrary commands as the CSF service account. The attack requires network access to the CSF management interface but no prior authentication. WebPros has patched this issue in version 16.30; users on earlier versions should upgrade immediately.
Affected products
- ConfigServer Security & Firewall before 16.30
Timeline
- 2026-09-10: disclosed