CVE-2017-12952 in libgig
Summary
by MITRE
The LoadString function in helper.h in libgig 4.0.0 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted gig file.
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Analysis
by VulDB Data Team • 12/09/2024
The vulnerability identified as CVE-2017-12952 resides within the libgig library version 4.0.0, specifically in the LoadString function located in the helper.h file. This issue represents a classic null pointer dereference vulnerability that can be exploited by remote attackers through the manipulation of crafted gig files. The libgig library serves as a crucial component for handling gigabyte-sized audio files, commonly used in music production and digital audio applications. When a maliciously constructed gig file is processed by software utilizing this library, the LoadString function fails to properly validate input parameters, leading to a scenario where a null pointer is dereferenced during the string loading process.
The technical flaw manifests when the LoadString function encounters malformed or specially crafted data within the gig file structure. This function is designed to extract and load string data from the file, but due to insufficient input validation mechanisms, it does not adequately check whether the expected data structures are properly initialized before attempting to access them. The vulnerability follows the CWE-476 pattern of null pointer dereference, where a pointer expected to point to valid memory is either uninitialized or set to null, causing the application to crash when attempting to access the memory location. This particular implementation flaw allows attackers to craft gig files that contain malicious string references, triggering the null pointer dereference condition when the library processes these files.
The operational impact of this vulnerability extends beyond simple denial of service, as it can disrupt legitimate audio processing workflows and potentially provide a foothold for more sophisticated attacks. Applications that rely on libgig for gig file processing become vulnerable to remote exploitation, enabling attackers to crash applications without requiring local system access. This makes the vulnerability particularly dangerous in networked environments where audio files might be processed automatically or through web interfaces. The crash occurs during the string loading phase, which is a fundamental operation in audio file processing, meaning that any application using this library could be affected regardless of the specific audio processing context. The vulnerability can be exploited in various scenarios including automated file processing systems, web-based audio editors, and desktop applications that handle gig file imports.
Mitigation strategies for this vulnerability should focus on immediate library updates and input validation enhancements. The most effective solution involves upgrading to a patched version of libgig that addresses the null pointer dereference issue in the LoadString function. Organizations should also implement robust input validation measures that can detect and reject malformed gig files before they reach the vulnerable code paths. This approach aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as it prevents malicious input from being processed through the application. Additional defensive measures include implementing sandboxing mechanisms for file processing, deploying intrusion detection systems that can identify suspicious gig file patterns, and establishing strict file validation procedures. The vulnerability demonstrates the importance of proper error handling and input validation in audio processing libraries, as highlighted by CWE-248, which addresses the issue of an exception being thrown but not properly caught. Security teams should also consider implementing automated scanning of gig files for known malicious patterns and establishing monitoring protocols to detect unusual application crash patterns that might indicate exploitation attempts.