CVE-2020-29667 in M3 ATM Monitoring System
Summary
by MITRE • 12/10/2020
In Lan ATMService M3 ATM Monitoring System 6.1.0, a remote attacker able to use a default cookie value, such as PHPSESSID=LANIT-IMANAGER, can achieve control over the system because of Insufficient Session Expiration.
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Analysis
by VulDB Data Team • 12/15/2020
The vulnerability identified as CVE-2020-29667 affects the Lan ATMService M3 ATM Monitoring System version 6.1.0, representing a critical security flaw that enables remote attackers to gain unauthorized system control. This issue stems from the system's inadequate session management practices, specifically the use of predictable default cookie values that remain unchanged across sessions. The vulnerability is categorized under CWE-613, which addresses Insufficient Session Expiration, a weakness that allows attackers to maintain persistent access to systems through compromised session identifiers.
The technical exploitation of this vulnerability occurs when an attacker discovers and utilizes the default PHPSESSID value of LANIT-IMANAGER, which serves as a persistent session identifier throughout the system's operation. This predictable session token eliminates the security benefits typically provided by randomized session identifiers, enabling attackers to maintain unauthorized access without proper authentication. The flaw exists because the system fails to implement proper session management protocols that would automatically invalidate or rotate session identifiers upon user logout or after a predetermined period of inactivity.
From an operational perspective, this vulnerability presents a severe risk to ATM monitoring systems that rely on the Lan ATMService M3 platform for security and operational oversight. The persistent nature of the default session identifier means that any attacker who gains knowledge of this value can maintain system access indefinitely, potentially enabling them to monitor ATM transactions, manipulate system configurations, or even execute malicious commands against the monitoring infrastructure. This vulnerability directly impacts the confidentiality, integrity, and availability of the ATM monitoring system, potentially compromising sensitive financial data and operational security.
The security implications extend beyond simple unauthorized access, as this flaw aligns with multiple techniques described in the MITRE ATT&CK framework under the T1566 category for Phishing and T1078 for Valid Accounts, where attackers can leverage default credentials or predictable session tokens to establish persistent access. Organizations using this system face significant risk of prolonged unauthorized access that could go undetected for extended periods, potentially leading to data breaches, financial losses, and operational disruptions. The vulnerability represents a fundamental failure in implementing basic session management security controls that are essential for maintaining system integrity and protecting against unauthorized access.
Mitigation strategies should include immediate implementation of randomized session identifiers, enforcement of proper session expiration policies, and removal of default credentials or predictable session tokens from production environments. System administrators should also implement session management controls that automatically invalidate sessions upon user logout, implement session timeout mechanisms, and regularly audit session usage patterns to detect potential unauthorized access attempts. Additionally, organizations should conduct comprehensive security assessments of their ATM monitoring systems to identify similar vulnerabilities and ensure proper implementation of session management best practices as outlined in OWASP session management guidelines and NIST cybersecurity frameworks.