CVE-2007-1545 in Network Audio System
Summary
by MITRE
The AddResource function in server/dia/resource.c in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to cause a denial of service (server crash) via a nonexistent client ID.
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Analysis
by VulDB Data Team • 07/17/2019
The Network Audio System NAS represents a critical audio server implementation that handles audio streaming and resource management across networked environments. This particular vulnerability exists within the AddResource function located in server/dia/resource.c, which serves as a core component responsible for managing audio resources within the system. The flaw manifests when the function processes requests containing invalid client identifiers, creating a condition where legitimate system operations can be disrupted through carefully crafted malicious input. This vulnerability specifically affects NAS versions prior to 1.8a SVN 237, indicating that the issue was present in widely deployed versions of the software and likely exposed numerous installations to potential exploitation.
The technical nature of this vulnerability stems from insufficient input validation within the AddResource function, which fails to properly handle cases where a client identifier does not correspond to any active client connection. When a remote attacker submits a request containing a nonexistent client ID, the function attempts to process this invalid reference without proper error handling mechanisms. This leads to a memory access violation or null pointer dereference that ultimately results in the NAS server crashing and terminating its operation. The vulnerability operates at the protocol level, making it particularly dangerous as it requires no authentication or privileged access to exploit, allowing any remote attacker to potentially disrupt audio services.
The operational impact of this vulnerability extends beyond simple service disruption, as it represents a fundamental flaw in the system's resource management and error handling capabilities. A successful exploitation can lead to complete denial of service for audio services, affecting any application or user relying on NAS for audio streaming capabilities. This vulnerability particularly impacts environments where NAS servers serve multiple clients or where audio services are mission-critical, such as in broadcast environments, multimedia applications, or enterprise audio systems. The crash condition creates a persistent availability issue that requires manual intervention to restore service, potentially causing significant disruption to audio workflows and user experience.
Mitigation strategies for this vulnerability should focus on immediate patch application to update to NAS version 1.8a SVN 237 or later, which contains the necessary fixes for proper client ID validation and error handling. Organizations should also implement network segmentation and access controls to limit exposure of NAS servers to untrusted networks, while monitoring for suspicious client connection patterns that might indicate exploitation attempts. The vulnerability aligns with CWE-125, which addresses out-of-bounds read conditions, and may be categorized under ATT&CK technique T1499.1 for network denial of service attacks. Additionally, implementing proper input validation and error handling mechanisms within the application code can help prevent similar issues from occurring in other components of the system, ensuring robust protection against similar exploitation vectors that might target resource management functions.