CVE-2018-18192 in libgig
Summary
by MITRE
An issue was discovered in libgig 4.1.0. There is a NULL pointer dereference in the function DLS::File::GetFirstSample() in DLS.cpp.
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Analysis
by VulDB Data Team • 04/01/2020
The vulnerability identified as CVE-2018-18192 represents a critical null pointer dereference flaw within the libgig library version 4.1.0, specifically within the DLS::File::GetFirstSample() function located in DLS.cpp. This library serves as a crucial component for handling gigabyte-sized audio file formats commonly used in professional audio applications and digital audio workstations. The flaw manifests when the application attempts to access a null pointer reference during the processing of DLS (Downloadable Sounds) files, which are essential for sound synthesis and audio sample management in various music production software environments.
The technical nature of this vulnerability stems from inadequate input validation and error handling within the DLS file parsing mechanism. When the DLS::File::GetFirstSample() function processes malformed or specially crafted DLS files, it fails to properly check for null pointer conditions before attempting to dereference memory addresses. This particular flaw falls under the CWE-476 category of NULL Pointer Dereference, which is classified as a common weakness in software security practices. The vulnerability demonstrates a classic lack of defensive programming where the code assumes certain pointers will always contain valid data without proper validation checks.
The operational impact of this vulnerability extends significantly within audio production environments where libgig is extensively utilized. Attackers can exploit this weakness by crafting malicious DLS files that trigger the null pointer dereference, potentially causing application crashes or system instability. In professional settings, this could lead to data loss, interrupted creative workflows, and potential denial of service conditions affecting audio engineers and musicians working with digital audio software. The vulnerability is particularly concerning because it can be triggered through legitimate file processing operations, making it difficult to distinguish between normal usage and malicious exploitation attempts.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1203 which involves exploiting software vulnerabilities to gain system access or cause service disruption. The null pointer dereference creates an opportunity for attackers to either cause system crashes that can be leveraged for denial of service attacks or potentially escalate privileges if the vulnerable application has elevated permissions. Mitigation strategies should include immediate patching of libgig library to version 4.1.1 or later where the null pointer validation has been implemented. Additionally, implementing proper input sanitization measures, deploying application whitelisting policies, and establishing monitoring protocols for unusual application crash patterns can help detect and prevent exploitation attempts. Organizations using this library should also consider implementing sandboxing techniques for processing untrusted audio files and regularly updating their software dependencies to address known vulnerabilities in third-party libraries.