CVE-2018-4835 in Server Basic
Summary
by MITRE
A vulnerability has been identified in TeleControl Server Basic < V3.1. An attacker with network access to the TeleControl Server Basic's port 8000/tcp could bypass the authentication mechanism and read limited information.
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Analysis
by VulDB Data Team • 02/02/2023
The vulnerability identified as CVE-2018-4835 affects TeleControl Server Basic versions prior to V3.1, representing a critical authentication bypass flaw that exposes sensitive system information to unauthenticated attackers. This vulnerability specifically targets the application's web interface which operates on port 8000/tcp, making it accessible over the network. The flaw allows malicious actors to circumvent the intended authentication controls and gain access to restricted data without proper credentials, fundamentally compromising the security posture of affected systems.
This technical weakness stems from inadequate input validation and authentication mechanisms within the TeleControl Server Basic application. The vulnerability manifests when an attacker sends crafted requests to the web server listening on port 8000, bypassing the standard authentication flow that should protect access to system resources. According to CWE classification, this represents a weakness in authentication mechanisms, specifically categorized under CWE-287 which addresses improper handling of authentication tokens and credentials. The vulnerability falls within the ATT&CK framework under the privilege escalation and credential access tactics, as it enables unauthorized access to system information through bypassing authentication controls.
The operational impact of CVE-2018-4835 extends beyond simple information disclosure, as the ability to read limited information without authentication creates potential pathways for further exploitation. Attackers can potentially gather system configuration details, user information, or other sensitive data that could be leveraged for additional attacks. The vulnerability affects organizations that deploy TeleControl Server Basic for remote system management, particularly in industrial control environments where such systems may be exposed to untrusted networks. This exposure creates significant risk for critical infrastructure deployments where unauthorized access could lead to operational disruptions or security breaches.
Organizations should prioritize immediate remediation through upgrading to TeleControl Server Basic V3.1 or later versions that contain the necessary security patches. Network segmentation and access control measures should be implemented to restrict access to port 8000/tcp to trusted networks only, while monitoring for suspicious activity on this port. Security administrators should also consider implementing additional authentication layers and regular vulnerability assessments to identify similar weaknesses in other network services. The mitigation strategy should align with industry best practices for managing authentication vulnerabilities and should include network access control policies to minimize exposure windows while the patch is being deployed.