CVE-2024-9324: Intelbras Incontrol Web RCE Vulnerability

CVE-2024-9324 Overview

CVE-2024-9324 is a code injection vulnerability affecting Intelbras InControl versions up to 2.21.57. The flaw resides in the /v1/operador/ endpoint associated with the Relatório de Operadores (Operators Report) page. Attackers can manipulate the fields argument to inject code that the application processes without proper validation [CWE-94]. The vulnerability requires low-privileged network access and no user interaction. Intelbras addressed the issue in version 2.21.58, released on 2024-09-20 after an initial disclosure to the vendor on 2024-07-19. Public disclosure of the exploit details has occurred, increasing the risk of opportunistic exploitation against unpatched deployments.

Critical Impact
Authenticated remote attackers can inject arbitrary code through the fields parameter of the Operators Report endpoint, compromising the confidentiality, integrity, and availability of Intelbras InControl deployments.

Affected Products

Intelbras InControl Web 2.21.56
Intelbras InControl Web 2.21.57
All Intelbras InControl Web releases up to and including 2.21.57

Discovery Timeline

2024-07-19 - Vendor Intelbras notified of the vulnerability
2024-09-20 - Fixed version 2.21.58 released
2024-09-29 - CVE-2024-9324 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-9324

Vulnerability Analysis

The vulnerability affects the /v1/operador/ endpoint in the Operators Report component of Intelbras InControl Web. The application processes the fields argument without adequate input validation or sanitization. This allows an attacker to inject code that alters application behavior at runtime. The issue is classified under [CWE-74] (Improper Neutralization of Special Elements in Output) and [CWE-94] (Improper Control of Generation of Code). Exploitation requires network access and low privileges but does not require user interaction. Successful exploitation impacts the confidentiality, integrity, and availability of the affected system at limited scope.

Root Cause

The root cause is missing neutralization of user-supplied input within the fields parameter processed by the Operators Report page. The application incorporates attacker-controlled data into an execution context without escaping or validating dangerous characters. This behavior enables code injection when a malicious payload is supplied through the vulnerable endpoint.

Attack Vector

An authenticated attacker sends a crafted HTTP request to the /v1/operador/ endpoint containing a malicious value in the fields argument. The InControl Web application processes the payload as executable content rather than treating it as data. Because the attack vector is network-based, adversaries can target any exposed InControl Web instance without local access. Refer to the Intelbras Security Advisory and the VulDB advisory for further technical detail. No verified public proof-of-concept code is included in this article.

Detection Methods for CVE-2024-9324

Indicators of Compromise

HTTP requests to /v1/operador/ containing unusual characters, script fragments, or encoded payloads in the fields parameter.
Unexpected child processes or subprocess execution originating from the InControl Web application server.
Anomalous outbound network connections initiated by the InControl Web service following requests to the Operators Report endpoint.

Detection Strategies

Deploy web application firewall rules that inspect the fields parameter for injection patterns targeting the /v1/operador/ path.
Enable verbose HTTP access logging on the InControl Web server and alert on repeated 4xx/5xx responses from the vulnerable endpoint.
Baseline the process tree of the InControl Web service and alert on deviations that suggest injected code execution.

Monitoring Recommendations

Forward web server and application logs to a centralized SIEM for correlation with authentication and network telemetry.
Monitor operator account activity for unusual report generation patterns or access from unexpected source IP addresses.
Track integrity of InControl Web binaries and configuration files to detect post-exploitation persistence.

How to Mitigate CVE-2024-9324

Immediate Actions Required

Upgrade Intelbras InControl Web to version 2.21.58 or later using the official installer.
Restrict network access to the InControl Web management interface to trusted administrative segments only.
Rotate credentials for all operator accounts that may have been exposed prior to patching.

Patch Information

Intelbras released version 2.21.58 on 2024-09-20 to address CVE-2024-9324. The vendor originally targeted an end-of-August 2024 release but postponed the fix. Administrators should apply the update immediately and validate the installed version after patching. Details are available in the Intelbras Security Advisory.

Workarounds

Place the InControl Web server behind a reverse proxy that enforces strict input validation on requests to /v1/operador/.
Limit access to the Operators Report functionality to a minimum set of authenticated administrators until the patch is deployed.
Disable or block external network exposure of the InControl Web application where operationally feasible.

bash

# Example firewall rule restricting InControl Web access to a management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP