CVE-2007-1547 in Network Audio System
Summary
by MITRE
The ReadRequestFromClient function in server/os/io.c in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to cause a denial of service (crash) via multiple simultaneous connections, which triggers a NULL pointer dereference.
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Analysis
by VulDB Data Team • 07/17/2019
The Network Audio System NAS represents a critical audio server implementation that has been identified with a significant vulnerability in its core networking functionality. This vulnerability manifests within the ReadRequestFromClient function located in server/os/io.c, which serves as the primary interface for processing client requests. The flaw affects NAS versions prior to 1.8a SVN 237, indicating that this issue has persisted for an extended period within the software lifecycle. The vulnerability classification aligns with CWE-476 which specifically addresses NULL pointer dereferences, a common yet dangerous programming error that can lead to system instability and complete service disruption.
The technical exploitation of this vulnerability occurs through a specific attack pattern involving multiple simultaneous connections to the NAS server. When numerous clients establish concurrent connections, the ReadRequestFromClient function fails to properly validate or handle the connection state, leading to a scenario where a NULL pointer is dereferenced during the request processing cycle. This particular programming error causes the server process to crash immediately upon encountering the malformed connection sequence, resulting in a complete denial of service condition that affects all legitimate users of the audio service. The vulnerability demonstrates characteristics consistent with CWE-121 which describes stack-based buffer overflow conditions, though in this case the manifestation occurs through pointer handling rather than buffer manipulation.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the entire audio infrastructure that relies on NAS for its operation. Organizations using NAS for audio streaming, broadcasting, or multimedia applications face significant risk of service interruptions that could affect user experience and business operations. The vulnerability's exploitability requires only the ability to establish multiple connections to the target system, making it particularly dangerous as it can be executed by any remote attacker with network access. This characteristic places the vulnerability in the ATT&CK framework under the T1498 technique category, which covers denial of service attacks that target network services and applications.
Mitigation strategies for this vulnerability must focus on immediate patch deployment to versions 1.8a SVN 237 or later where the NULL pointer dereference issue has been resolved. System administrators should implement connection rate limiting and monitoring to detect unusual connection patterns that might indicate exploitation attempts. Network segmentation and access control measures can help reduce the attack surface by limiting which systems can establish connections to the NAS service. The vulnerability also highlights the importance of proper input validation and error handling in network service implementations, as the failure to properly validate connection states led to the crash condition. Organizations should conduct regular security assessments of their audio infrastructure and maintain up-to-date vulnerability management processes to prevent similar issues from arising in other network services. The remediation process should include thorough testing of patched versions to ensure that the fix does not introduce regressions in the audio service functionality while effectively addressing the NULL pointer dereference vulnerability.