CVE-2018-18088 in OpenJPEG
Summary
by MITRE
OpenJPEG 2.3.0 has a NULL pointer dereference for "red" in the imagetopnm function of jp2/convert.c
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Analysis
by VulDB Data Team • 05/23/2023
The vulnerability identified as CVE-2018-18088 represents a critical null pointer dereference flaw within the OpenJPEG library version 2.3.0. This issue specifically manifests in the imagetopnm function located within the jp2/convert.c source file, where the software fails to properly validate input parameters before attempting to access memory locations. The vulnerability occurs when processing certain JP2 image files that contain malformed or improperly structured "red" color component data, leading to an abrupt application termination when the program attempts to dereference a null pointer during image conversion operations.
The technical nature of this vulnerability places it squarely within the category of memory safety issues, specifically classified under CWE-476 which encompasses null pointer dereference conditions. This flaw demonstrates a classic programming error where the application does not adequately check for null return values from memory allocation functions or parameter validation routines before proceeding with operations that assume valid memory references. The vulnerability exists at the intersection of image processing and memory management, where the conversion process fails to implement proper defensive programming practices to handle edge cases in image data structures.
From an operational standpoint, this vulnerability presents a significant risk to systems that rely on OpenJPEG for image processing tasks, particularly in environments where untrusted image files are processed automatically. The null pointer dereference can be exploited through crafted malicious JP2 files that trigger the vulnerable code path during conversion operations, potentially leading to denial of service conditions where legitimate applications or services become unavailable. Attackers could leverage this vulnerability to disrupt image processing workflows in web applications, digital asset management systems, or any software that integrates OpenJPEG for JP2 format handling, making it particularly dangerous in high-availability environments where continuous operation is critical.
The impact of this vulnerability extends beyond simple service disruption as it represents a potential pathway for more sophisticated attacks within the broader ATT&CK framework's execution and privilege escalation domains. While the immediate effect is a denial of service condition, the underlying memory safety issue could potentially be chained with other vulnerabilities to create more severe exploitation scenarios. Organizations using OpenJPEG in production environments should consider this vulnerability as part of their broader security posture assessment, particularly in systems where image processing pipelines handle external inputs without proper sanitization. The vulnerability highlights the importance of input validation and defensive programming practices in multimedia processing libraries, where the complexity of image format parsing increases the attack surface for memory corruption issues.
Mitigation strategies for CVE-2018-18088 should prioritize immediate patching of affected OpenJPEG installations to version 2.3.1 or later, which contains the necessary code fixes to properly validate input parameters before memory access operations. Organizations should also implement robust input validation measures at the application level, including file format detection, size limitations, and sandboxed processing environments for untrusted image files. Network segmentation and access controls should be strengthened to limit exposure of systems that process JP2 images, while monitoring systems should be configured to detect unusual application termination patterns that could indicate exploitation attempts. Additionally, regular security assessments of multimedia processing pipelines should be conducted to identify similar vulnerabilities in other third-party libraries and ensure comprehensive protection against memory safety issues across the entire software ecosystem.