CVE-2018-13440 in audiofile
Summary
by MITRE
The audiofile Audio File Library 0.3.6 has a NULL pointer dereference bug in ModuleState::setup in modules/ModuleState.cpp, which allows an attacker to cause a denial of service via a crafted caf file, as demonstrated by sfconvert.
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Analysis
by VulDB Data Team • 08/13/2025
The vulnerability identified as CVE-2018-13440 represents a critical null pointer dereference flaw within the audiofile Audio File Library version 0.3.6. This issue specifically manifests in the ModuleState::setup function located within the modules/ModuleState.cpp source file, where the library fails to properly validate input data before attempting to access memory locations. The flaw occurs when processing crafted caf files through the sfconvert utility, creating a scenario where an attacker can deliberately trigger a system crash or service disruption. The vulnerability stems from inadequate error handling mechanisms that do not account for null pointer conditions during the module state initialization process, making it particularly dangerous in environments where audio file processing is automated or frequently occurs.
The technical exploitation of this vulnerability follows a well-defined pattern that aligns with CWE-476, which categorizes null pointer dereference issues as a fundamental programming error. When an attacker crafts a malicious caf file containing malformed data structures, the ModuleState::setup function attempts to dereference a pointer that remains uninitialized or set to null, leading to an immediate system crash. This behavior constitutes a denial of service condition that can be reliably reproduced and exploited across different systems running the vulnerable library version. The flaw demonstrates poor defensive programming practices where input validation occurs too late in the processing pipeline, allowing malformed data to propagate through the system until it reaches a critical memory access point.
From an operational impact perspective, this vulnerability creates significant risks for systems that rely on audio file processing capabilities, particularly those using the sfconvert utility for batch conversion or automated audio handling. The denial of service condition can be triggered remotely through file upload mechanisms or locally via crafted file execution, making it applicable in various attack scenarios including web application exploitation, file sharing platforms, and embedded audio processing systems. Organizations using the affected library version face potential service interruptions, system instability, and operational downtime that can affect user experience and business continuity. The vulnerability's exploitation requires minimal technical expertise, making it attractive to attackers seeking to disrupt services without sophisticated attack capabilities.
The mitigation strategy for CVE-2018-13440 involves immediate patching of the audiofile Audio File Library to version 0.3.7 or later, which includes proper null pointer validation in the ModuleState::setup function. System administrators should implement input validation measures that filter and sanitize audio file inputs before processing, particularly when dealing with user-uploaded content. Additionally, deploying intrusion detection systems that monitor for suspicious file processing patterns and implementing application sandboxing techniques can provide layered defense against exploitation attempts. Security teams should also consider disabling or restricting access to the sfconvert utility when it is not required for legitimate operations, reducing the attack surface available to potential adversaries. The vulnerability's classification under ATT&CK technique T1499.004 for network denial of service highlights the importance of maintaining robust input validation controls throughout the application lifecycle to prevent similar issues from arising in other components of the audio processing pipeline.