Overview
A high-risk vulnerability has been identified in the Telenium Online Web Application, with a CVSS severity score of 9.8, that may lead to a system compromise or data leakage. This critical security issue affects any application running on an unpatched version of the software. The vulnerability lies in a PHP endpoint accessible to unauthenticated users, which does not properly handle user-supplied input due to insecure termination of a regular expression check within the endpoint. The implications of this vulnerability are severe and demand immediate attention as it allows an attacker to inject arbitrary operating system commands leading to remote code execution.
Vulnerability Summary
CVE ID: CVE-2025-10659
Severity: Critical (9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Remote code execution, potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Telenium Online Web Application | All unpatched versions
How the Exploit Works
The vulnerability lies in the insecure termination of a regular expression check within a PHP endpoint. This endpoint is accessible to unauthenticated users, which means that anyone with network access could potentially exploit this vulnerability. Due to improper handling of user-supplied input, an attacker can inject arbitrary operating system commands via a specially crafted HTTP request. These commands are then executed on the server in the context of the web application service account, giving the attacker the ability to execute code remotely.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP request that injects malicious commands into the user-supplied input.
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"user_input": "; rm -rf /"
}In this example, the attacker is sending a command to delete all files in the root directory, which could potentially crash the entire system. This is a simplified example to illustrate the concept, actual attacks would likely be more complex and tailored to the specific system being targeted.
Recommended Mitigation
The best mitigation for this vulnerability is to apply the vendor’s patch as soon as possible. If immediate patching is not possible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation by blocking or alerting on suspicious activity. It is also recommended to restrict network access to sensitive endpoints as much as possible, and always validate and sanitize user-supplied input.