CVE-2023-37329 in GStreamer
Summary
by MITRE • 05/04/2024
GStreamer SRT File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GStreamer. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation.
The specific flaw exists within the parsing of SRT subtitle files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-20968.
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Analysis
by VulDB Data Team • 04/29/2026
The vulnerability identified as CVE-2023-37329 represents a critical heap-based buffer overflow in the GStreamer multimedia framework's handling of SRT subtitle files. This security flaw resides within the SRT file parsing functionality and constitutes a remote code execution vulnerability that can be exploited by attackers without requiring local system access. The vulnerability affects installations where GStreamer is used to process SRT subtitle files, making it particularly concerning given the widespread adoption of GStreamer in multimedia applications across various platforms and devices. The issue stems from inadequate input validation during the parsing of user-supplied data, specifically failing to properly validate the length of data before copying it into heap-based buffers.
The technical implementation of this vulnerability demonstrates a classic buffer overflow pattern where insufficient bounds checking occurs during SRT file processing. When GStreamer encounters an SRT subtitle file, it parses the content and attempts to copy data into internal heap buffers without verifying that the source data length conforms to buffer capacity limits. This allows an attacker to craft malicious SRT files containing oversized data payloads that exceed the allocated buffer space, resulting in memory corruption that can be leveraged for arbitrary code execution. The vulnerability's exploitation requires interaction with the GStreamer library, meaning that applications utilizing GStreamer for subtitle processing become potential attack vectors. The flaw's classification as a heap-based buffer overflow aligns with CWE-121, which specifically addresses heap-based buffer overflow conditions where insufficient bounds checking allows data to overwrite adjacent memory regions.
The operational impact of CVE-2023-37329 extends beyond simple code execution capabilities, as it can be exploited across multiple attack vectors depending on how GStreamer is implemented within target systems. Applications that automatically process or download SRT files from untrusted sources become particularly vulnerable, including media players, streaming services, content management systems, and any software that integrates GStreamer for subtitle handling. The remote nature of the vulnerability means attackers can exploit it through network-based delivery mechanisms without requiring physical access to target systems, making it especially dangerous for web-based applications and services. The attack surface expands significantly when considering that SRT files are commonly used in legitimate media workflows, creating legitimate attack paths that may go unnoticed by security monitoring systems. This vulnerability can be exploited in scenarios ranging from targeted attacks on media applications to broader exploitation in environments where automated subtitle processing occurs.
Mitigation strategies for CVE-2023-37329 should prioritize immediate patching of affected GStreamer installations, as the vulnerability's remote exploitability makes it critical to address promptly. Organizations should implement network-based restrictions that prevent processing of untrusted SRT files, particularly in web-facing applications where automated file handling occurs. Input validation controls should be strengthened at all levels where SRT files are processed, including application-level validation before GStreamer processing occurs. Security monitoring should be enhanced to detect unusual SRT file processing patterns and potential exploitation attempts. The vulnerability's characteristics align with ATT&CK technique T1203, which involves exploitation of remote services for code execution, and T1059, which covers command and scripting interpreter usage for execution. System administrators should also consider implementing sandboxing techniques for subtitle processing and maintaining up-to-date threat intelligence regarding similar vulnerabilities in multimedia frameworks. Regular security assessments of multimedia processing pipelines should be conducted to identify other potential attack vectors that may leverage similar input handling flaws.