RaspAP is an open-source software solution that allows users to easily set up a wireless access point on Raspberry Pi devices, providing a web-based interface for managing Wi-Fi networking functions. It is widely used by hobbyists, educators, and professionals for creating Wi-Fi hotspots, offering features like SSID broadcasting, password management, and DHCP server configuration. RaspAP is praised for its simplicity and flexibility, enabling quick deployment of Wi-Fi networks for a variety of applications such as home automation, educational labs, and small office setups.
The CVE-2022-39986 vulnerability in RaspAP versions 2.8.0 to 2.8.7 allows unauthenticated attackers to perform command injection attacks. This flaw is due to improper validation of user input in the cfg_id parameter within specific PHP files. Attackers can exploit this vulnerability to execute arbitrary commands on the underlying operating system without needing any authentication, making it a critical security issue.
Specifically, the vulnerability resides in the handling of the cfg_id parameter in the RaspAP web interface. The affected PHP files fail to sanitize or validate the input before passing it to system-level functions, such as exec() or shell_exec(). This allows an attacker to inject malicious commands by crafting a specially crafted HTTP request to the vulnerable endpoint, leading to remote code execution.
If exploited, an attacker can gain full control over the Raspberry Pi device running RaspAP. This includes the ability to install malware, exfiltrate sensitive data, pivot to other devices on the network, or disrupt Wi-Fi services. Given the CVSS score of 9.8, this vulnerability poses a severe risk to the integrity and security of networks utilizing RaspAP.
- Immediately upgrade RaspAP to version 2.8.8 or later, which patches the CVE-2022-39986 vulnerability.
- Implement strict input validation and sanitization for all user-supplied parameters, especially cfg_id, to prevent command injection.
- Disable unnecessary PHP functions like exec(), shell_exec(), and system() in the php.ini configuration if not required.
- Enforce strong authentication and authorization controls for all web interface endpoints, even if they are intended for internal use.
- Regularly audit and update all software components, including the operating system and dependencies, to their latest secure versions.
- Deploy a web application firewall (WAF) to detect and block malicious requests targeting command injection vulnerabilities.
- Monitor system logs for unusual command execution attempts and set up alerts for suspicious activities.
- Consider network segmentation to isolate Raspberry Pi devices running RaspAP from critical systems.
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