DataEase Remote Code Execution via Malicious Font File

Executive Summary

This vulnerability affects DataEase, an open source data visualization and analysis tool. Before version 2.10.24, there was a security flaw that allowed an authenticated attacker to bypass protections related to the H2 zip protocol and file dropper fix. Specifically, the attacker could upload a zip archive disguised with a .ttf (font) file extension via the FontManage.saveFile function. By exploiting the zip protocol through this disguised file, the attacker could achieve remote code execution on the affected system.

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Impact Analysis

This vulnerability can have a severe impact as it allows an authenticated attacker to execute arbitrary code remotely on the affected system. This means the attacker could potentially take full control of the system, leading to data theft, data manipulation, service disruption, or further attacks within the network.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade DataEase to version 2.10.24 or later, where the issue is fixed.

Additionally, restrict authenticated users from uploading files with disguised extensions such as .ttf that could be exploited via the zip protocol.

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Compliance Impact

CVE-2026-55633 allows an authenticated attacker to achieve remote code execution by uploading a malicious ZIP archive disguised as a .ttf font file. This type of vulnerability can lead to unauthorized access and control over the affected system, potentially resulting in data breaches or manipulation of sensitive information.

Such unauthorized access and potential data compromise can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require strict controls over data confidentiality, integrity, and security.

Organizations using vulnerable versions of DataEase prior to 2.10.24 may face increased risk of non-compliance due to the possibility of remote code execution and subsequent data exposure or system compromise.

Upgrading to version 2.10.24, which fixes this vulnerability, is essential to maintain compliance and reduce the risk of security incidents that could violate regulatory requirements.

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Detection Guidance

This vulnerability involves an authenticated attacker uploading a ZIP archive disguised with a .ttf extension through the FontManage.saveFile endpoint, which then can be exploited for remote code execution. Detection would focus on monitoring for suspicious file uploads with .ttf extensions that are actually ZIP archives and checking for unusual file operations related to font files.

Since the vulnerability is exploited via file uploads and path traversal in the font management module, you can detect it by inspecting uploaded files and their contents, and by monitoring logs for suspicious activity around the FontManage.saveFile endpoint.

• Check for files with a .ttf extension that are actually ZIP archives. For example, on a Linux system, you can use the 'file' command to verify the file type: file suspicious_file.ttf
• Search for recently uploaded .ttf files in the font directory and verify their contents: find /path/to/font/directory -name '*.ttf' -exec file {} \; | grep Zip
• Monitor application logs for calls to the FontManage.saveFile endpoint and look for unusual or repeated uploads of .ttf files.
• Use network monitoring tools to detect suspicious POST requests to the font upload endpoint that include .ttf files.

Upgrading to version 2.10.24 or later is the recommended mitigation to prevent exploitation.

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