CVE-2024-1623 in FAST3686 V2 Vodafone
Summary
by MITRE • 03/14/2024
Insufficient session timeout vulnerability in the FAST3686 V2 Vodafone router from Sagemcom. This vulnerability could allow a local attacker to access the administration panel without requiring login credentials. This vulnerability is possible because the 'Login.asp and logout.asp' files do not handle session details correctly.
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Analysis
by VulDB Data Team • 03/14/2024
The CVE-2024-1623 vulnerability represents a critical session management flaw in the FAST3686 V2 Vodafone router manufactured by Sagemcom, classified under CWE-613 which addresses insufficient session expiration or invalidation. This vulnerability stems from improper handling of session identifiers within the router's web administration interface, specifically in the Login.asp and logout.asp files that govern user authentication and session lifecycle management. The flaw allows local attackers to maintain persistent access to the administrative panel without requiring valid credentials, fundamentally undermining the router's security posture and creating a persistent backdoor for unauthorized access.
The technical implementation of this vulnerability exploits the absence of proper session timeout mechanisms and inadequate session validation logic within the router's web server components. When a user accesses the administration panel, the system should establish a secure session with appropriate timeout parameters and proper session invalidation upon logout. However, the flawed implementation in this router model fails to properly destroy session state information when users log out, and does not enforce adequate session expiration policies. This creates a scenario where session tokens remain valid indefinitely, allowing attackers who gain local network access to reuse existing session identifiers and bypass authentication mechanisms entirely.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete administrative control over the router's configuration settings, network parameters, and security policies. This level of access enables malicious actors to modify firewall rules, change network configurations, install malware, redirect traffic, and potentially establish persistent access points for further attacks. The vulnerability is particularly concerning because it affects a widely deployed consumer-grade router model, making it accessible to a broad range of threat actors who may exploit it for network infiltration, data exfiltration, or as a pivot point for attacking other devices within the local network. The local network access requirement does not significantly limit the attack surface since many users operate these devices in home or office environments where physical access or network compromise is already possible.
Security professionals should implement immediate mitigations including disabling the web administration interface when not actively needed, implementing network segmentation to isolate router management interfaces, and ensuring that all network devices are regularly updated with the latest firmware releases. Organizations should also consider deploying network monitoring solutions to detect unusual administrative access patterns and establish robust network access controls to prevent unauthorized access to router management interfaces. The vulnerability demonstrates the critical importance of proper session management in embedded systems and web applications, aligning with ATT&CK technique T1078 which covers valid accounts and T1566 which addresses credential harvesting. Additionally, this vulnerability underscores the necessity of implementing proper input validation and session handling mechanisms as outlined in OWASP Top Ten categories and the NIST Cybersecurity Framework, particularly in IoT and network infrastructure devices where persistent access can lead to significant security breaches across entire network domains.