CVE-2020-10366 in LogicalDOC
Summary
by MITRE
LogicalDoc before 8.3.3 allows /servlet.gupld Directory Traversal, a different vulnerability than CVE-2020-9423 and CVE-2020-10365.
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Analysis
by VulDB Data Team • 05/17/2024
The vulnerability identified as CVE-2020-10366 represents a directory traversal flaw in LogicalDoc versions prior to 8.3.3 that specifically affects the /servlet.gupld endpoint. This weakness enables attackers to access files and directories outside the intended web root, potentially exposing sensitive system resources and data. The vulnerability operates through a logical flaw in how the application processes file upload requests, allowing malicious users to manipulate path parameters and navigate the filesystem beyond permitted boundaries. Unlike related vulnerabilities CVE-2020-9423 and CVE-2020-10365, this issue specifically targets the servlet endpoint responsible for handling file uploads and related operations. The flaw falls under the Common Weakness Enumeration category CWE-22, which classifies directory traversal vulnerabilities as weaknesses that occur when applications fail to properly validate or sanitize user-supplied input that affects file system paths. This vulnerability is particularly concerning because it can be exploited to access configuration files, source code, database credentials, and other sensitive artifacts that should remain protected within the application's secure boundaries.
The technical implementation of this directory traversal vulnerability allows an attacker to manipulate the servlet.gupld endpoint by injecting directory traversal sequences such as ../ or ..\ into file path parameters. When the application processes these requests without proper input validation, it can be coerced into accessing files in parent directories or even system-level locations. The operational impact extends beyond simple information disclosure, as successful exploitation can lead to complete system compromise through access to administrative files, database connection details, and potentially the execution of arbitrary code if combined with other vulnerabilities. Attackers can leverage this weakness to retrieve sensitive documents, system configuration files, or even backup files that contain critical system information. The vulnerability's exploitation requires minimal privileges and can be executed through standard web browser interactions, making it particularly dangerous for enterprise environments where LogicalDoc serves as a document management platform.
Organizations utilizing LogicalDoc versions before 8.3.3 face significant risk from this vulnerability, as it can be exploited by both authenticated and unauthenticated attackers depending on the application's configuration. The attack surface is broad since the servlet endpoint is typically accessible to various user roles within the system, potentially allowing privilege escalation attacks. Security teams should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly under the technique T1083 for discovering system information and T1074 for data staging. The vulnerability's persistence across multiple versions indicates a fundamental flaw in input validation that requires immediate remediation. Organizations should prioritize patching to version 8.3.3 or later, as this release includes proper input sanitization and path validation mechanisms that prevent directory traversal attacks. Additionally, implementing network segmentation, web application firewalls, and monitoring for suspicious path traversal patterns can provide additional defense-in-depth measures while awaiting the official security update.
The remediation approach for CVE-2020-10366 requires immediate deployment of the vendor-provided patch for LogicalDoc 8.3.3, which addresses the root cause through enhanced input validation and proper path resolution mechanisms. Security administrators should also implement comprehensive monitoring of the /servlet.gupld endpoint for unusual access patterns and directory traversal attempts. Network-level controls including firewall rules that restrict access to sensitive servlet endpoints can provide additional protection. Organizations should conduct thorough vulnerability assessments to identify any other instances of similar path traversal vulnerabilities within their LogicalDoc installations or related systems. The fix typically involves implementing strict input validation that rejects or normalizes any path components containing traversal sequences, along with proper file system access controls that prevent unauthorized access to sensitive directories. Regular security audits of web application endpoints should be conducted to ensure that similar weaknesses are not present in other parts of the application infrastructure, particularly in file upload and management functions that may be vulnerable to similar attacks.