CVE-2014-9832 in ImageMagick
Summary
by MITRE
Heap overflow in ImageMagick 6.8.9-9 via a crafted pcx file.
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Analysis
by VulDB Data Team • 12/07/2024
The vulnerability identified as CVE-2014-9832 represents a critical heap overflow condition within ImageMagick version 6.8.9-9, specifically triggered by processing maliciously crafted pcx image files. This flaw resides in the image processing library's handling of pcx format data structures, where insufficient bounds checking allows attackers to manipulate memory allocation parameters through carefully constructed input files. The vulnerability manifests when the software attempts to parse pcx file headers and subsequently allocate heap memory for image data, creating conditions where user-supplied data can overwrite adjacent memory regions beyond intended allocation boundaries. This heap overflow represents a classic memory corruption vulnerability that can potentially lead to arbitrary code execution when exploited successfully.
The technical implementation of this vulnerability stems from inadequate input validation within ImageMagick's pcx decoder component. When processing a specially crafted pcx file, the application reads header fields that specify image dimensions and color information without proper validation of these values against expected ranges. The parser fails to verify that the calculated memory requirements for image data remain within safe limits, allowing an attacker to specify dimensions that result in excessive memory allocation requests. This improper handling aligns with CWE-122, Heap-based Buffer Overflow, which specifically addresses buffer overflows occurring in heap memory allocations where insufficient checks prevent overflows during dynamic memory management operations.
The operational impact of CVE-2014-9832 extends beyond simple denial of service scenarios, presenting significant security risks in environments where ImageMagick processes untrusted image files. Attackers can leverage this vulnerability through web applications, email systems, or file processing services that utilize ImageMagick for image conversion and manipulation tasks. The heap overflow can potentially be exploited to execute arbitrary code with the privileges of the affected application, making it particularly dangerous in server environments where ImageMagick might run with elevated permissions. This vulnerability is especially concerning in contexts where automated image processing occurs, such as content management systems, social media platforms, or document processing pipelines that may inadvertently process maliciously crafted pcx files.
Mitigation strategies for CVE-2014-9832 should prioritize immediate patching of affected ImageMagick installations to version 6.8.9-10 or later, which includes fixes addressing the heap overflow conditions in pcx file processing. System administrators should implement comprehensive input validation measures, including file type verification and content scanning, to prevent malicious pcx files from reaching the image processing pipeline. Network segmentation and privilege separation can help limit the potential impact of successful exploitation by ensuring that ImageMagick processes operate with minimal necessary permissions. Additionally, implementing application whitelisting controls and monitoring for unusual memory allocation patterns can provide early detection capabilities for potential exploitation attempts. The vulnerability's classification under ATT&CK technique T1059.007 (Command and Scripting Interpreter: PowerShell) highlights the importance of monitoring for automated exploitation attempts that may leverage this vulnerability in conjunction with other attack vectors. Organizations should also consider implementing sandboxing mechanisms for image processing tasks to contain potential exploitation impacts and maintain compliance with security standards such as NIST SP 800-53 controls for vulnerability management and system security planning.