CVE-2008-3680 in Ventrilo
Summary
by MITRE
The decryption function in Flagship Industries Ventrilo 3.0.2 and earlier allows remote attackers to cause a denial of service (NULL pointer dereference and server crash) by sending a type 0 packet with an invalid version followed by another packet to TCP port 3784.
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability identified as CVE-2008-3680 affects Flagship Industries Ventrilo 3.0.2 and earlier versions, presenting a critical denial of service weakness that can be exploited remotely. This flaw resides within the software's decryption function, specifically targeting the protocol handling mechanism that processes incoming network packets on the designated TCP port 3784. The vulnerability manifests when an attacker crafts and sends a sequence of malformed packets to the target server, creating a condition that leads to a NULL pointer dereference and subsequent server crash.
The technical exploitation involves sending a type 0 packet containing an invalid version field followed by a second packet to the vulnerable TCP port 3784. This specific packet sequence triggers a flaw in the software's input validation and packet processing logic, where the decryption function fails to properly handle malformed data structures. The NULL pointer dereference occurs when the application attempts to access memory through an invalid pointer reference, causing the application to terminate abruptly and resulting in a complete service disruption. This vulnerability directly maps to CWE-476 which describes NULL pointer dereference conditions, and represents a classic example of improper input validation leading to application instability.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be leveraged by attackers to create persistent availability issues for legitimate users of the Ventrilo service. The remote nature of the exploit means that attackers can target vulnerable systems from anywhere on the network without requiring local access or authentication credentials. This makes the vulnerability particularly dangerous in environments where Ventrilo servers are exposed to untrusted networks or where multiple users rely on the service for communication. The server crash resulting from this attack effectively prevents legitimate users from accessing voice communication services, potentially disrupting business operations, gaming sessions, or collaborative work environments that depend on the platform.
Mitigation strategies for this vulnerability should focus on immediate patching of affected Ventrilo installations to version 3.0.3 or later, which contains the necessary fixes for the decryption function. Network administrators should also implement firewall rules to restrict access to TCP port 3784 to trusted sources only, reducing the attack surface for remote exploitation. Additionally, monitoring network traffic for suspicious packet sequences targeting this specific port can help detect potential exploitation attempts. From a defensive perspective, this vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks, and represents a common pattern of exploitation targeting protocol parsing functions. Organizations should also consider implementing intrusion detection systems that can identify and alert on malformed packet patterns consistent with this vulnerability, providing early warning capabilities for potential attacks. The vulnerability demonstrates the importance of robust input validation and proper error handling in network services, as well as the critical need for regular security updates and vulnerability assessments to maintain system integrity.