CVE-2016-8707 in ImageMagick
Summary
by MITRE
An exploitable out of bounds write exists in the handling of compressed TIFF images in ImageMagicks's convert utility. A crafted TIFF document can lead to an out of bounds write which in particular circumstances could be leveraged into remote code execution. The vulnerability can be triggered through any user controlled TIFF that is handled by this functionality.
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Analysis
by VulDB Data Team • 10/12/2022
The vulnerability identified as CVE-2016-8707 represents a critical out-of-bounds write flaw within ImageMagick's convert utility that processes compressed TIFF image files. This issue falls under the CWE-787 Out-of-bounds Write classification, where the software writes data past the boundaries of a allocated buffer during TIFF decompression operations. The vulnerability exists in the image processing pipeline where compressed TIFF data is parsed and converted, creating an opportunity for attackers to manipulate memory layout and potentially execute arbitrary code remotely.
The technical implementation of this flaw occurs when ImageMagick's convert utility encounters specially crafted TIFF files that contain malformed compression data structures. During the decompression process, the software fails to properly validate the size and boundaries of compressed data segments, allowing an attacker to overflow buffer allocations that are intended to hold decompressed image data. This buffer overflow can overwrite adjacent memory regions including function pointers, return addresses, or other critical program state information, creating potential for arbitrary code execution.
The operational impact of CVE-2016-8707 extends beyond simple local exploitation as the vulnerability can be triggered through any user-controlled TIFF file processed by ImageMagick's convert utility. This makes it particularly dangerous in web applications, content management systems, or any environment where users can upload or process TIFF images. The remote code execution capability arises from the ability to overwrite critical memory locations with attacker-controlled data, potentially allowing an attacker to gain full system control when the vulnerable application processes malicious image files.
Security researchers have mapped this vulnerability to ATT&CK technique T1203 Exploitation for Client Execution, where attackers leverage software vulnerabilities to execute malicious code on target systems. The attack vector typically involves delivering a malicious TIFF file through web uploads, email attachments, or other file transfer mechanisms, with the exploit succeeding when the vulnerable ImageMagick library processes the image during conversion or display operations. Organizations using ImageMagick in web-facing applications or file processing systems are particularly at risk from this vulnerability.
Mitigation strategies for CVE-2016-8707 include applying the latest security patches from ImageMagick developers, implementing strict file validation and sanitization procedures, and employing sandboxing techniques to isolate image processing operations. System administrators should also consider disabling unnecessary image format support in ImageMagick installations and implementing network-based restrictions to limit exposure to vulnerable applications. The vulnerability highlights the importance of proper input validation and memory safety practices in image processing libraries, as well as the critical need for regular security updates in widely-used software components.