CVE-2020-35561 in mymbCONNECT24
Summary
by MITRE • 02/16/2021
An issue was discovered in MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 through 2.6.2. There is an SSRF in the HA module allowing an unauthenticated attacker to scan for open ports.
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Analysis
by VulDB Data Team • 03/02/2021
The vulnerability identified as CVE-2020-35561 represents a significant security flaw within the MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 software versions up to 2.6.2. This issue resides within the HA module of the system and constitutes a server-side request forgery vulnerability that exposes the platform to unauthorized network scanning activities. The flaw allows unauthenticated attackers to leverage the system's functionality to perform port scanning operations against internal network resources without proper authorization, creating a substantial risk for organizations relying on these connectivity solutions.
The technical implementation of this vulnerability stems from insufficient input validation and improper handling of user-supplied data within the HA module's network request processing functionality. When the system processes external requests that contain malformed or maliciously crafted parameters, it fails to properly sanitize or validate the input before using it in network communication operations. This lack of proper validation creates an attack surface where malicious actors can manipulate the system to make network requests to arbitrary destinations, effectively enabling them to scan for open ports on internal systems that would normally be protected by network segmentation. The vulnerability is particularly concerning because it operates at the network level, allowing attackers to bypass traditional perimeter security measures and directly probe internal network infrastructure.
The operational impact of this vulnerability extends beyond simple port scanning capabilities and represents a critical threat to organizational network security posture. Attackers can utilize this flaw to map internal network topologies, identify running services, and potentially discover additional vulnerable systems within the network. The unauthenticated nature of the attack means that no credentials or prior access are required to begin reconnaissance activities, making the vulnerability particularly dangerous for environments where network segmentation is not properly implemented. This capability directly aligns with tactics described in the attack pattern taxonomy under the MITRE ATT&CK framework, specifically relating to initial access and reconnaissance phases where adversaries establish footholds and gather intelligence about target environments. The vulnerability essentially provides attackers with a stealthy method to perform network reconnaissance without triggering traditional security alerts that might be associated with more obvious scanning activities.
Organizations utilizing affected versions of MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 should immediately implement mitigation strategies to address this vulnerability. The most effective approach involves implementing strict input validation and sanitization within the HA module to prevent external parameters from being used in network operations without proper authorization. Network segmentation measures should be reinforced to limit the potential impact of successful exploitation, and access controls should be strengthened to prevent unauthorized access to system management interfaces. Additionally, implementing network monitoring and anomaly detection systems can help identify suspicious scanning activities that may indicate exploitation attempts. The vulnerability's classification under CWE-918, which addresses server-side request forgery, indicates that the remediation efforts should focus on strengthening the application's validation mechanisms and ensuring that all external inputs are properly checked before being used in network communication contexts. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in related systems and prevent exploitation of comparable vulnerabilities across the organization's infrastructure.