CVE-2018-7264 in ActivePDF
Summary
by MITRE
The Pictview image processing library embedded in the ActivePDF toolkit through 2018.1.0.18321 is prone to multiple out of bounds write and sign errors, allowing a remote attacker to execute arbitrary code on vulnerable applications using the ActivePDF Toolkit to process untrusted images.
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Analysis
by VulDB Data Team • 09/03/2025
The CVE-2018-7264 vulnerability resides within the Pictview image processing library that is embedded in the ActivePDF toolkit version 2018.1.0.18321 and earlier. This flaw represents a critical security issue that affects applications leveraging the ActivePDF Toolkit for image processing operations. The vulnerability stems from inadequate input validation and memory management within the Pictview component, which is responsible for handling various image formats including jpeg and png files. When applications process untrusted image files through the ActivePDF Toolkit, the vulnerable library fails to properly validate image dimensions and data structures, creating opportunities for malicious actors to exploit the system.
The technical implementation of this vulnerability manifests through multiple out of bounds write conditions and sign handling errors that occur during image parsing operations. These flaws arise from the library's failure to properly validate image headers, dimension parameters, and pixel data boundaries before performing memory allocations and data writes. The out of bounds write conditions specifically occur when the library attempts to write data beyond allocated memory buffers, while the sign errors typically involve improper handling of negative values in size calculations or index operations. These issues are categorized under CWE-121 for stack-based buffer overflow and CWE-125 for out-of-bounds read conditions, which are common indicators of memory corruption vulnerabilities. The vulnerability can be exploited through specially crafted image files that contain malformed headers or dimension values designed to trigger these memory corruption conditions during processing.
The operational impact of CVE-2018-7264 is severe and far-reaching, as it allows remote code execution attacks against systems that utilize the ActivePDF Toolkit for image processing tasks. Attackers can craft malicious image files that, when processed by vulnerable applications, will trigger the memory corruption conditions and potentially allow arbitrary code execution with the privileges of the affected application. This vulnerability affects a wide range of applications including web applications, document processing systems, and enterprise software that rely on ActivePDF for handling image content. The remote nature of the attack means that exploitation can occur without user interaction, making it particularly dangerous for web-facing applications that process user-uploaded images. The vulnerability's impact is amplified when applications process images from untrusted sources such as user uploads, third-party content, or web services, as these scenarios provide direct attack vectors for remote exploitation.
Mitigation strategies for CVE-2018-7264 should focus on immediate remediation through the application of vendor patches and updates. The ActivePDF vendor has released versions that address the memory corruption issues within the Pictview library, and organizations should prioritize upgrading to these patched versions. Additionally, implementing input validation controls at the application level can provide defense in depth measures, including image format validation, size restrictions, and content scanning before processing. Network-based mitigations such as web application firewalls can help detect and block malicious image files, while application sandboxing can limit the potential impact of successful exploitation attempts. Organizations should also consider implementing strict image processing policies that restrict the types of images accepted by applications and establish monitoring procedures to detect unusual processing patterns that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1203 for Exploitation for Client Execution and T1059 for Command and Scripting Interpreter, indicating the attack surface and execution methods that threat actors can leverage. Regular security assessments and vulnerability scanning should be conducted to identify other potentially affected components that might be using the vulnerable Pictview library.