CVE-2017-17499 in ImageMagick
Summary
by MITRE
ImageMagick before 6.9.9-24 and 7.x before 7.0.7-12 has a use-after-free in Magick::Image::read in Magick++/lib/Image.cpp.
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Analysis
by VulDB Data Team • 01/17/2023
The vulnerability identified as CVE-2017-17499 represents a critical use-after-free flaw within ImageMagick's Magick++ library implementation. This security issue affects both the legacy 6.x series and the newer 7.x series of the software, specifically targeting versions prior to 6.9.9-24 and 7.0.7-12 respectively. The flaw manifests in the Magick::Image::read function located within Magick++/lib/Image.cpp, making it particularly concerning given ImageMagick's widespread adoption across various platforms and applications. The vulnerability stems from improper memory management during image file processing operations, where freed memory locations are accessed after the original allocation has been released.
The technical implementation of this use-after-free vulnerability occurs when ImageMagick processes malformed image files through its Magick++ interface. During the reading process, the system allocates memory for image data structures and subsequently frees this memory when processing completes or encounters errors. However, the code fails to properly invalidate pointers or reset references to the freed memory regions, allowing potential attackers to manipulate the system's memory state. This flaw falls under the CWE-416 category of Use After Free, which is classified as a critical memory safety issue in software development practices. The vulnerability is particularly dangerous because it can be exploited through crafted image files that trigger the specific code path in the Magick::Image::read function, enabling attackers to execute arbitrary code on systems running vulnerable versions of ImageMagick.
The operational impact of this vulnerability extends across multiple attack vectors and system environments where ImageMagick is deployed. The flaw can be exploited through web applications that process user-uploaded images, file sharing platforms, or any system that utilizes ImageMagick for image processing tasks. Attackers can craft malicious image files that, when processed by the vulnerable software, trigger the use-after-free condition and potentially lead to remote code execution. This vulnerability is particularly concerning in server environments where ImageMagick is used to handle untrusted image input from multiple sources, as it could allow attackers to gain unauthorized system access. The potential for privilege escalation exists when the vulnerable software runs with elevated permissions, making this a significant threat to system integrity and security.
Mitigation strategies for CVE-2017-17499 require immediate patching of affected systems to upgrade to versions 6.9.9-24 or 7.0.7-12, which contain the necessary memory management fixes. Organizations should implement strict image validation processes and avoid processing untrusted image files through vulnerable applications. Network segmentation and access controls can help limit the potential impact of successful exploitation attempts. Security monitoring should be enhanced to detect unusual image processing activities that might indicate exploitation attempts. Additionally, developers should review their applications for proper error handling and memory management practices, implementing defensive programming techniques such as pointer validation and proper resource cleanup. The vulnerability demonstrates the importance of maintaining up-to-date software libraries and implementing robust input validation to prevent memory safety issues that could be exploited through the ATT&CK framework's technique T1059 for execution and T1203 for exploitation of software vulnerabilities.