CVE-2017-12803 in mkclean
Summary
by MITRE
The Node_ValidatePtr function in corec/corec/node/node.c in mkclean 0.8.9 allows remote attackers to cause a denial of service (assert fault) via a crafted mkv file.
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Analysis
by VulDB Data Team • 01/10/2023
The vulnerability identified as CVE-2017-12803 resides within the mkclean 0.8.9 media processing library, specifically in the Node_ValidatePtr function located in corec/corec/node/node.c. This flaw represents a critical security issue that can be exploited remotely to trigger a denial of service condition through deliberate manipulation of multimedia file structures. The mkclean utility is designed for cleaning and processing matroska video files, commonly used in media processing workflows where automated handling of video content is required. When processing specially crafted mkv files, the Node_ValidatePtr function fails to properly validate pointer references, leading to an assertion failure that terminates the application process.
The technical mechanism behind this vulnerability involves improper input validation within the core processing loop of the mkclean library. The Node_ValidatePtr function is responsible for ensuring that memory pointers referenced during video file parsing remain valid and properly allocated. When attackers supply maliciously constructed mkv files containing crafted metadata or structural elements, the validation logic becomes bypassed or overwhelmed, causing the assertion mechanism to trigger and halt program execution. This represents a classic buffer over-read or pointer dereference vulnerability that falls under the CWE-682 weakness category, specifically related to incorrect use of pointers in memory management. The flaw demonstrates poor defensive programming practices where insufficient boundary checking and input sanitization allow malformed data to propagate through the system's validation layers.
From an operational perspective, this vulnerability presents significant risks to organizations relying on automated media processing systems. Remote attackers can exploit this weakness to disrupt media processing pipelines, causing service interruptions that may affect content delivery networks, video transcoding services, or automated workflow systems. The denial of service impact extends beyond simple application crashes, potentially affecting business continuity when processing systems become unavailable due to malicious file uploads or automated attacks targeting media ingestion points. The vulnerability is particularly concerning in environments where mkclean is used as part of larger processing chains, as a single malicious file could cause cascading failures throughout the entire media processing infrastructure. Security practitioners should consider this weakness in the context of the ATT&CK framework's privilege escalation and denial of service tactics, as it enables adversaries to disrupt services without requiring elevated privileges.
Mitigation strategies for CVE-2017-12803 should focus on immediate patching of the mkclean library to version 0.8.10 or later, which contains the necessary fixes for the Node_ValidatePtr function. Organizations should implement defensive measures such as input sanitization at the network boundary, where all incoming media files are validated against known good patterns before being processed by mkclean. Additionally, deploying intrusion detection systems that monitor for unusual file processing patterns or application crashes can help detect exploitation attempts. Network segmentation and limiting access to media processing systems can reduce the attack surface, while implementing proper error handling and graceful degradation mechanisms ensures that partial failures do not completely halt processing workflows. The vulnerability highlights the importance of robust input validation and defensive programming practices in multimedia processing libraries, emphasizing the need for comprehensive testing of edge cases and malformed input scenarios.