CVE-2024-37570 in 6869i
Summary
by MITRE • 06/09/2024
On Mitel 6869i 4.5.0.41 devices, the Manual Firmware Update (upgrade.html) page does not perform sanitization on the username and path parameters (sent by an authenticated user) before appending flags to the busybox ftpget command. This leads to $() command execution.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/25/2024
The vulnerability identified as CVE-2024-37570 affects Mitel 6869i IP phone devices running firmware version 4.5.0.41 and potentially other versions within the same release. This represents a critical command injection flaw that exists within the device's web interface upgrade functionality. The vulnerability is particularly concerning because it operates within a manually triggered update page that requires authentication, yet still allows for arbitrary command execution through improper input validation.
The technical flaw manifests in the upgrade.html page where the system fails to properly sanitize user-supplied input parameters including username and path values. These parameters are directly incorporated into a busybox ftpget command without adequate sanitization or validation measures. When an authenticated user submits these parameters, the system appends them to the command execution string without proper escaping or filtering, creating an environment where command injection becomes possible. The specific vulnerability pattern aligns with CWE-77 which describes improper neutralization of special elements used in a command, and CWE-94 which covers the execution of arbitrary code through code injection.
The operational impact of this vulnerability is significant as it allows an authenticated attacker to execute arbitrary commands on the affected device with the privileges of the web server process. This could potentially enable an attacker to gain full control over the phone's functionality, access network resources, or use the device as a pivot point for further attacks within the network. The vulnerability is particularly dangerous because it does not require elevated privileges beyond basic authentication and can be exploited through a web interface that is likely accessible to users within the organization's network.
Mitigation strategies should focus on immediate firmware updates from Mitel to address the command injection vulnerability. Organizations should also implement network segmentation to limit access to these devices to authorized personnel only, and consider implementing web application firewalls to detect and prevent malicious command injection attempts. Additionally, the principle of least privilege should be enforced by ensuring that only necessary users have access to the upgrade functionality, and regular security audits should be conducted to identify similar vulnerabilities in other networked devices. This vulnerability demonstrates the importance of input validation and proper command construction in embedded systems, aligning with ATT&CK technique T1059.001 for command and script injection.