CVE-2014-9833 in ImageMagick
Summary
by MITRE
Heap overflow in ImageMagick 6.8.9-9 via a crafted psd file.
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Analysis
by VulDB Data Team • 12/07/2024
The vulnerability identified as CVE-2014-9833 represents a critical heap overflow condition within ImageMagick version 6.8.9-9, specifically triggered by processing maliciously crafted psd files. This issue stems from inadequate input validation and memory management practices during the parsing of photoshop document format files, creating a pathway for arbitrary code execution. The flaw exists in the image processing pipeline where insufficient bounds checking allows attackers to manipulate memory allocation patterns through carefully constructed file structures. The vulnerability manifests when the software attempts to allocate heap memory for image data that exceeds expected boundaries, potentially leading to memory corruption and system compromise.
This heap overflow vulnerability operates at the intersection of multiple cybersecurity domains and aligns with CWE-122, which specifically addresses heap-based buffer overflow conditions. The technical implementation involves the manipulation of psd file headers and metadata structures to force the ImageMagick library into allocating insufficient memory for image data processing. Attackers can exploit this by crafting psd files with malformed dimensions, color depth specifications, or layer information that causes the software to miscalculate memory requirements. The overflow occurs during the decompression and rendering phases of image processing, where the application's memory management routines fail to properly validate the size parameters provided in the malicious file structure. This vulnerability is particularly dangerous because it can be triggered through automated image processing workflows, making it a prime target for remote exploitation in web applications and file processing services.
The operational impact of CVE-2014-9833 extends beyond simple privilege escalation, as it can enable full system compromise when exploited in environments where ImageMagick is used for automated image handling. The vulnerability affects web applications, content management systems, and file processing services that utilize ImageMagick for image conversion and manipulation tasks. When exploited successfully, the heap overflow can lead to denial of service conditions, arbitrary code execution, and potential privilege escalation to the level of the executing process. The attack vector typically involves uploading a malicious psd file to a vulnerable system, which then processes the file through ImageMagick's image conversion routines. This creates a persistent threat in environments where user-uploaded content is automatically processed, as the vulnerability can be leveraged to gain unauthorized access to systems without requiring authentication.
Mitigation strategies for CVE-2014-9833 should focus on immediate patching of ImageMagick installations to version 6.8.9-10 or later, which contains the necessary memory validation fixes. Organizations should implement strict file type validation and sanitize all image uploads before processing, particularly disabling support for psd files when they are not required for business operations. Network-level defenses can include implementing file content filtering and sandboxing mechanisms that isolate image processing operations from critical system components. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all systems running vulnerable versions of ImageMagick and establish monitoring procedures for suspicious file processing activities. The ATT&CK framework categorizes this vulnerability under privilege escalation and execution techniques, with specific relevance to T1059 command and scripting interpreter and T1203 proxy execution patterns that may be employed during exploitation. Regular security updates and patch management procedures should be implemented to prevent similar vulnerabilities from being exploited in the future, as this type of heap-based buffer overflow represents a common attack surface in multimedia processing libraries.