CVE-2017-14863 in Exiv2
Summary
by MITRE
A NULL pointer dereference was discovered in Exiv2::Image::printIFDStructure in image.cpp in Exiv2 0.26. The vulnerability causes a segmentation fault and application crash, which leads to denial of service.
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Analysis
by VulDB Data Team • 03/04/2025
The vulnerability identified as CVE-2017-14863 represents a critical null pointer dereference flaw within the Exiv2 image processing library version 0.26. This issue resides in the Exiv2::Image::printIFDStructure function located in the image.cpp source file, where the software fails to properly validate pointer references before attempting to dereference them. The flaw specifically manifests when processing certain malformed or crafted image files that contain invalid IFD (Image File Directory) structures, leading to unpredictable application behavior and system instability.
The technical implementation of this vulnerability stems from inadequate input validation within the image processing pipeline of Exiv2. When the printIFDStructure function encounters an image file with malformed metadata or corrupted IFD entries, it attempts to access a null pointer without proper null checks, resulting in an immediate segmentation fault. This type of flaw falls under CWE-476 which specifically addresses NULL pointer dereference conditions that can lead to application crashes and system instability. The vulnerability demonstrates poor defensive programming practices where the code assumes certain pointers will always contain valid references without proper validation mechanisms.
From an operational perspective, this vulnerability creates significant denial of service risks for applications that rely on Exiv2 for image metadata processing. Systems utilizing Exiv2 for image handling, including web applications, digital asset management systems, and photography software, become susceptible to crashes when processing maliciously crafted image files. The segmentation fault resulting from this null pointer dereference can cause complete application termination, potentially allowing attackers to perform persistent denial of service attacks against image processing services. This vulnerability is particularly concerning in server environments where Exiv2 is used to process user-uploaded images, as it provides a straightforward path for remote attackers to disrupt service availability.
The impact of this vulnerability extends beyond simple application crashes, as it represents a fundamental security weakness that can be exploited to compromise system stability and availability. Attackers can craft specific image files containing malformed IFD structures that trigger the null pointer dereference when processed by Exiv2, leading to complete service disruption. This type of vulnerability aligns with ATT&CK technique T1499 which covers network denial of service attacks, and more specifically targets the application layer where Exiv2 operates as a critical image processing component. Organizations should consider this vulnerability as part of their broader security posture assessment, particularly in environments where Exiv2 is integrated into web applications or content management systems.
Mitigation strategies for CVE-2017-14863 should prioritize immediate patching of Exiv2 installations to version 0.27 or later, which contains the necessary fixes for this null pointer dereference vulnerability. Additionally, implementing proper input validation and sanitization measures within applications that utilize Exiv2 can provide defense-in-depth protection against malformed image files. System administrators should consider deploying intrusion detection systems that can identify and block suspicious image file uploads, while also implementing proper application sandboxing to limit the impact of potential exploitation. Organizations should also review their incident response procedures to ensure rapid detection and remediation of any exploitation attempts targeting this vulnerability.