CVE-2019-11832 in TYPO3
Summary
by MITRE
TYPO3 8.x before 8.7.25 and 9.x before 9.5.6 allows remote code execution because it does not properly configure the applications used for image processing, as demonstrated by ImageMagick or GraphicsMagick.
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Analysis
by VulDB Data Team • 09/15/2023
This vulnerability exists in TYPO3 content management systems where the application fails to properly configure image processing utilities, specifically ImageMagick or GraphicsMagick, creating a critical remote code execution vector. The flaw affects TYPO3 versions 8.x prior to 8.7.25 and 9.x prior to 9.5.6, representing a significant security weakness that can be exploited by remote attackers without authentication. The vulnerability stems from insufficient input validation and sanitization within the image processing pipeline, allowing maliciously crafted image files to trigger arbitrary command execution on the server.
The technical implementation of this vulnerability occurs when TYPO3 processes uploaded images through ImageMagick or GraphicsMagick without proper configuration of the underlying image processing libraries. These libraries are configured to accept and execute commands embedded within image files, particularly when the image format supports features like embedded shell commands or when the processing chain lacks proper sandboxing mechanisms. The flaw aligns with CWE-78, which describes improper neutralization of special elements used in OS commands, and CWE-20, which covers inputs that are not properly sanitized. Attackers can exploit this by uploading specially crafted image files that contain malicious payloads designed to execute arbitrary commands on the target system.
The operational impact of CVE-2019-11832 is severe and far-reaching, as it allows attackers to gain complete control over affected TYPO3 servers. Successful exploitation can lead to data breaches, system compromise, and potential lateral movement within network environments. The vulnerability is particularly dangerous because it requires no authentication and can be exploited through the standard file upload functionality available to users. This creates a significant risk for websites running TYPO3 CMS, as attackers can execute commands with the privileges of the web server process, potentially leading to full system compromise. The vulnerability also aligns with ATT&CK technique T1059, which covers command and scripting interpreters, and T1078, which addresses valid accounts, as the exploitation can occur through legitimate upload mechanisms.
Organizations should immediately apply the security patches released by TYPO3 for versions 8.7.25 and 9.5.6, which address the improper configuration of image processing utilities. System administrators should also implement additional mitigations including restricting file upload capabilities, implementing proper input validation for image files, and configuring the underlying image processing libraries with proper security restrictions. Network monitoring should be enhanced to detect suspicious file upload activities and command execution patterns. The vulnerability demonstrates the critical importance of proper library configuration and input sanitization in web applications, particularly when dealing with file processing functionalities that interact with system-level utilities. Security teams should also consider implementing web application firewalls and runtime application self-protection measures to detect and prevent exploitation attempts.