CVE-2016-7531 in ImageMagick
Summary
by MITRE
MagickCore/memory.c in ImageMagick allows remote attackers to cause a denial of service (out-of-bounds write) via a crafted PDB file.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 11/19/2024
The vulnerability identified as CVE-2016-7531 represents a critical out-of-bounds write flaw within ImageMagick's MagickCore library, specifically in the memory.c component that handles PDB file processing. This vulnerability resides in the memory management subsystem of ImageMagick, which is widely used for image manipulation and conversion across numerous platforms and applications. The flaw manifests when the software processes specially crafted PDB (Program Database) files, which are commonly used by Microsoft Visual C++ compilers for debugging information. When an attacker uploads or processes such malicious PDB files, the vulnerable code fails to properly validate buffer boundaries during memory allocation and data copying operations, leading to memory corruption that can be exploited to crash the application or potentially execute arbitrary code.
The technical implementation of this vulnerability involves improper bounds checking within the memory allocation routines that handle PDB file parsing. According to CWE-787, this maps directly to out-of-bounds write conditions where the application writes data past the end of a allocated buffer. The flaw occurs during the processing of PDB file headers and metadata, where the software calculates buffer sizes based on malformed input data without sufficient validation. When a malicious PDB file contains crafted header values that specify larger data sections than actually exist, the memory.c component attempts to allocate memory and copy data beyond the intended buffer boundaries. This type of vulnerability is particularly dangerous because it can be triggered through various attack vectors including web uploads, file processing in automated systems, or network-based file transfers, making it a prime target for remote exploitation.
The operational impact of CVE-2016-7531 extends far beyond simple denial of service, as the out-of-bounds write condition can potentially lead to complete system compromise when exploited effectively. Systems running ImageMagick in web applications, content management systems, or file processing pipelines become vulnerable to remote code execution attacks that could allow attackers to gain unauthorized access to server resources. The vulnerability affects numerous applications that rely on ImageMagick for image processing, including popular web platforms, email servers, and file sharing systems. From an ATT&CK framework perspective, this vulnerability maps to T1203 (Exploitation for Client Execution) and T1059 (Command and Scripting Interpreter) as attackers could leverage the memory corruption to execute malicious code on compromised systems. The widespread adoption of ImageMagick across different software ecosystems means that a single vulnerable instance can create cascading security issues throughout connected networks and applications.
Mitigation strategies for CVE-2016-7531 should include immediate patching of affected ImageMagick installations to version 6.9.3-9 or later, which contains the necessary memory validation fixes. Organizations should implement strict file validation controls that prevent processing of PDB files or other potentially malicious binary formats through ImageMagick components. Network-based mitigations include implementing file type filtering at firewalls and web application firewalls to block PDB file uploads and processing. The vulnerability also highlights the importance of input validation and memory safety practices in software development, particularly for libraries that handle untrusted data from external sources. Security teams should conduct comprehensive vulnerability assessments of all systems that utilize ImageMagick, including web applications, automated file processing systems, and any services that accept user-uploaded files. Additionally, implementing sandboxing techniques and privilege separation can limit the potential impact of successful exploitation attempts, while regular security monitoring and log analysis should be employed to detect any suspicious file processing activities that might indicate attempted exploitation of this vulnerability.