CVE-2025-56816 in Datart
Summary
by MITRE • 09/24/2025
Datart 1.0.0-rc.3 is vulnerable to Directory Traversal. The configuration file handling of the application allows attackers to upload arbitrary YAML files to the config/jdbc-driver-ext.yml path. The application parses this file using SnakeYAML's unsafe load() or loadAs() method without input sanitization. This allows deserialization of attacker-controlled YAML content, leading to arbitrary class instantiation. Under certain conditions, this can be exploited to achieve remote code execution (RCE).
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Analysis
by VulDB Data Team • 09/24/2025
The vulnerability identified as CVE-2025-56816 affects Datart version 1.0.0-rc.3 and represents a critical directory traversal flaw that enables remote code execution through unsafe YAML deserialization. This vulnerability arises from the application's improper handling of configuration files, specifically allowing unauthorized file uploads to the sensitive config/jdbc-driver-ext.yml path. The flaw demonstrates a classic insecure deserialization pattern where the application employs SnakeYAML's unsafe load() or loadAs() methods without adequate input validation or sanitization measures.
The technical exploitation of this vulnerability leverages the inherent dangers of YAML deserialization when combined with directory traversal capabilities. Attackers can craft malicious YAML content that, when parsed by SnakeYAML's unsafe methods, results in arbitrary class instantiation. This deserialization process bypasses normal security boundaries and allows attackers to execute arbitrary code on the target system. The vulnerability is particularly dangerous because it combines multiple attack vectors within a single flaw, creating a pathway for both privilege escalation and remote code execution. The SnakeYAML library's unsafe loading methods are designed to deserialize arbitrary Java objects from YAML content, making them inherently dangerous when processing untrusted input.
The operational impact of this vulnerability extends beyond simple data compromise, as it provides attackers with complete system control through remote code execution capabilities. An attacker who successfully exploits this vulnerability can execute arbitrary commands with the privileges of the application process, potentially leading to full system compromise. The vulnerability affects the application's configuration management system, which is typically a critical component that should be protected against unauthorized modifications. This flaw allows attackers to modify the application's JDBC driver configuration, potentially redirecting database connections to malicious endpoints or executing malicious code through the database connection mechanism.
Security mitigations for CVE-2025-56816 should focus on implementing proper input validation and sanitization measures before any YAML content is processed. Organizations should immediately disable or restrict file upload capabilities to the vulnerable configuration paths and implement strict access controls for configuration files. The most effective remediation involves replacing SnakeYAML's unsafe load() and loadAs() methods with safe alternatives that perform proper input validation and restrict deserialization to whitelisted classes only. Additionally, implementing proper file system permissions and restricting write access to configuration directories will significantly reduce the attack surface. This vulnerability aligns with CWE-502 which specifically addresses unsafe deserialization and represents a common pattern seen in the ATT&CK framework under the technique T1059 for command and scripting interpreter. The vulnerability demonstrates how insecure deserialization combined with improper access controls can create a path to complete system compromise. Organizations should also consider implementing network segmentation and monitoring for unusual file upload activities to detect potential exploitation attempts. The fix requires careful attention to the application's security architecture and proper implementation of the principle of least privilege for configuration file handling operations.
This vulnerability represents a significant risk to organizations using Datart 1.0.0-rc.3 and highlights the critical importance of secure coding practices, particularly around deserialization and file handling operations. The combination of directory traversal and unsafe deserialization creates a particularly dangerous attack vector that should be addressed immediately through patching or implementing compensating controls. Security teams should prioritize this vulnerability in their risk assessment and remediation planning, as the potential for full system compromise makes it a high-priority security concern.