CVE-2018-12599 in ImageMagick
Summary
by MITRE
In ImageMagick 7.0.8-3 Q16, ReadBMPImage and WriteBMPImage in coders/bmp.c allow attackers to cause an out of bounds write via a crafted file.
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Analysis
by VulDB Data Team • 03/28/2023
The vulnerability identified as CVE-2018-12599 represents a critical out-of-bounds write flaw within ImageMagick's bitmap image handling functionality. This issue affects versions up to and including ImageMagick 7.0.8-3, specifically impacting the ReadBMPImage and WriteBMPImage functions located in the coders/bmp.c source file. The vulnerability stems from inadequate bounds checking during the processing of malformed bitmap files, creating a scenario where maliciously crafted input can trigger memory corruption.
The technical exploitation of this vulnerability occurs when ImageMagick attempts to parse or generate bitmap image files without proper validation of input parameters. During the image processing workflow, the software fails to verify array boundaries or buffer limits when handling specific bitmap structures, particularly those involving color table entries or pixel data arrays. This inadequate validation allows attackers to craft specially formatted bitmap files that cause the application to write data beyond allocated memory regions, potentially leading to memory corruption and arbitrary code execution.
From an operational perspective, this vulnerability presents significant security risks to systems that process untrusted image files, particularly those that utilize ImageMagick as part of their image handling pipeline. The out-of-bounds write condition can be exploited through various attack vectors including web applications that accept image uploads, email servers processing image attachments, or any system that automatically processes bitmap files from unknown sources. The impact extends beyond simple memory corruption as it can potentially enable remote code execution, privilege escalation, or denial of service conditions depending on the specific implementation and target environment.
The vulnerability aligns with CWE-121, which specifically addresses stack-based buffer overflow conditions, and can be categorized under the broader ATT&CK technique T1059.007 for command and scripting interpreter. Security practitioners should consider this flaw as part of a larger attack surface involving image processing libraries, particularly in environments where automated image handling is prevalent. Organizations using ImageMagick in production environments should prioritize immediate patching and implementation of input validation controls to prevent exploitation.
Mitigation strategies should include immediate upgrade to ImageMagick versions that have addressed this vulnerability, typically those beyond 7.0.8-3. Additionally, implementing strict input validation and sanitization measures for all image file processing, deploying network segmentation to limit exposure, and establishing monitoring for suspicious image file processing activities can significantly reduce the risk of exploitation. System administrators should also consider implementing application-level sandboxes or containerization for image processing functions to contain potential exploitation attempts. The vulnerability demonstrates the critical importance of robust input validation in multimedia processing libraries and serves as a reminder of the potential security implications of insufficient bounds checking in image format parsers.