CVE-2017-12876 in ImageMagick
Summary
by MITRE
Heap-based buffer overflow in enhance.c in ImageMagick before 7.0.6-6 allows remote attackers to cause a denial of service via a crafted file.
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Analysis
by VulDB Data Team • 12/16/2022
The vulnerability identified as CVE-2017-12876 represents a critical heap-based buffer overflow flaw within ImageMagick's enhance.c component, affecting versions prior to 7.0.6-6. This security defect resides in the image processing library's handling of enhanced image operations, where improper memory management during file parsing creates exploitable conditions that can be leveraged by remote attackers to disrupt system operations. The flaw specifically manifests when the software processes crafted malicious image files that trigger unexpected memory allocation behaviors, leading to buffer overflows in heap memory regions.
The technical implementation of this vulnerability stems from inadequate bounds checking within the image enhancement routines that process various image formats. When ImageMagick encounters specially crafted input files, the enhance.c module fails to properly validate the size and structure of incoming data before attempting to copy or manipulate memory segments. This oversight results in writes that exceed allocated buffer boundaries, potentially corrupting adjacent memory locations and causing unpredictable program behavior. The heap-based nature of the overflow means that the vulnerability occurs in dynamically allocated memory areas, making exploitation more complex but still highly dangerous as it can lead to arbitrary code execution or system crashes.
From an operational impact perspective, this vulnerability enables remote attackers to execute denial of service attacks against systems running vulnerable versions of ImageMagick. The attack vector requires only that an adversary successfully convinces a target to process a maliciously crafted image file, which can occur through various means including web uploads, email attachments, or file sharing platforms. The consequences extend beyond simple service disruption, as the buffer overflow can potentially lead to complete system compromise if attackers can leverage additional vulnerabilities or if the affected system processes untrusted image content in privileged contexts. The vulnerability affects any application that relies on ImageMagick for image processing, including web applications, content management systems, and digital asset management platforms.
Organizations should prioritize immediate patching of all systems running ImageMagick versions prior to 7.0.6-6 to mitigate this vulnerability. The remediation process involves upgrading to the patched version that includes proper bounds checking and memory validation mechanisms. Security teams should also implement network-based controls such as content filtering and file type validation to prevent processing of suspicious image files, particularly in high-risk environments where untrusted input is common. Additionally, organizations should conduct thorough vulnerability assessments to identify all systems utilizing ImageMagick and ensure that proper input sanitization measures are in place. This vulnerability aligns with CWE-121 heap-based buffer overflow category and may map to ATT&CK technique T1203 for process injection or T1499 for endpoint denial of service, depending on the specific exploitation context and operational environment.