Overview
In this blog post, we will be discussing a high-severity vulnerability, CVE-2025-56816, found in Datart version 1.0.0-rc.3. This vulnerability allows attackers to commit a Directory Traversal attack, which could potentially lead to system compromise or data leakage. It primarily affects users and organizations utilizing the Datart application, and its severity lies in the fact that it could be exploited to achieve Remote Code Execution (RCE) under certain conditions.
Vulnerability Summary
CVE ID: CVE-2025-56816
Severity: High (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Datart | 1.0.0-rc.3
How the Exploit Works
The exploit takes advantage of the configuration file handling in the Datart 1.0.0-rc.3 application. The application permits attackers to upload arbitrary YAML files to the `config/jdbc-driver-ext.yml` path. The application then parses this file by utilizing SnakeYAML’s unsafe `load()` or `loadAs()` methods, all without any form of input sanitization. This allows for the deserialization of attacker-controlled YAML content, leading to arbitrary class instantiation. Under specific conditions, this vulnerability can be exploited to attain Remote Code Execution (RCE).
Conceptual Example Code
The following conceptual example illustrates how the vulnerability might be exploited. It is a sample HTTP request where a malicious YAML file is uploaded:
POST /upload/config/jdbc-driver-ext.yml HTTP/1.1
Host: target.example.com
Content-Type: application/yaml
{ "malicious_yaml_content": "..." }In this example, the attacker uploads a YAML file with malicious content to the `config/jdbc-driver-ext.yml` path. The application then parses this file using the unsafe method, leading to potential arbitrary class instantiation and possible Remote Code Execution.
Mitigation
The recommendation is to apply the vendor patch as soon as possible. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation. It is also advisable to implement strict input validation rules to prevent the upload of arbitrary YAML files.
