CVE-2017-14532 in ImageMagick
Summary
by MITRE
ImageMagick 7.0.7-0 has a NULL Pointer Dereference in TIFFIgnoreTags in coders/tiff.c.
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Analysis
by VulDB Data Team • 12/29/2022
CVE-2017-14532 represents a critical null pointer dereference vulnerability within ImageMagick's TIFF image processing module, specifically in the TIFFIgnoreTags function located in the coders/tiff.c source file. This vulnerability arises when the software attempts to access a null pointer during the processing of malformed TIFF image files, creating a potential crash condition that can be exploited by malicious actors. The flaw manifests when ImageMagick encounters specially crafted TIFF files that contain invalid tag structures, causing the application to dereference a null pointer reference and subsequently terminate abnormally.
The technical implementation of this vulnerability stems from inadequate input validation within the TIFF parser component of ImageMagick. When processing TIFF files, the software relies on predefined tag structures to interpret image data, but fails to properly validate pointer references before dereferencing them. This specific issue falls under CWE-476 which categorizes null pointer dereference vulnerabilities as a common weakness in software security. The vulnerability is particularly concerning because TIFF format is widely used across various applications and systems, making the attack surface extensive and potentially exploitable in multiple contexts.
The operational impact of CVE-2017-14532 extends beyond simple application crashes, as it can be leveraged for denial of service attacks against systems running ImageMagick or applications that utilize it as a dependency. Attackers can craft malicious TIFF files that trigger the null pointer dereference, causing the target system to crash or become unresponsive. This vulnerability is particularly dangerous in web applications that allow user-uploaded images, as it can be exploited to disrupt services or potentially escalate privileges if the application runs with elevated permissions. The vulnerability also aligns with ATT&CK technique T1203 which involves exploitation of software vulnerabilities for system compromise.
Mitigation strategies for this vulnerability require immediate patching of ImageMagick installations to version 7.0.7-1 or later, which contains the necessary fixes to properly validate pointer references in the TIFF processing code. System administrators should also implement input validation controls to filter out potentially malicious image files before they reach the ImageMagick processing layer. Additional defensive measures include running ImageMagick in restricted environments with limited privileges, implementing network segmentation to isolate vulnerable systems, and monitoring for abnormal application behavior that might indicate exploitation attempts. Organizations should also consider implementing sandboxing techniques to contain potential exploitation attempts and regularly audit their software dependencies to identify and remediate similar vulnerabilities across their infrastructure.