CVE-2024-31848: CData API Server Path Traversal Flaw

CVE-2024-31848 Overview

A critical path traversal vulnerability exists in the Java version of CData API Server prior to version 23.4.8844 when running using the embedded Jetty server. This vulnerability allows an unauthenticated remote attacker to gain complete administrative access to the application by exploiting improper path validation in HTTP requests.

Critical Impact

Unauthenticated attackers can exploit this path traversal vulnerability to gain complete administrative access to the CData API Server, potentially compromising all data and configurations managed by the application.

Affected Products

• CData API Server (Java version) < 23.4.8844
• CData API Server deployments using the embedded Jetty server

Discovery Timeline

• 2024-04-05 - CVE-2024-31848 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-31848

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as path traversal or directory traversal. The flaw exists in the Java implementation of CData API Server specifically when deployed with the embedded Jetty server configuration.

The vulnerability allows attackers to bypass normal access controls by manipulating file path references in HTTP requests. By crafting specially formatted path sequences, an attacker can traverse outside the intended directory structure and access restricted administrative endpoints or sensitive files that should not be accessible to unauthenticated users.

The exploitation potential is significant, with an EPSS probability of 93.601% placing this vulnerability in the 99.83rd percentile—indicating an extremely high likelihood of active exploitation in the wild.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization of user-supplied path components in HTTP requests processed by the embedded Jetty server. The application fails to properly neutralize special path elements such as ../ sequences or URL-encoded variants, allowing attackers to escape the intended web root and access files or endpoints outside the application's designated scope.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability remotely by sending crafted HTTP requests to the vulnerable CData API Server. The malicious requests contain path traversal sequences that bypass directory restrictions, ultimately granting the attacker administrative access to the application.

The attack flow typically involves:

1. Identifying a CData API Server instance running on the embedded Jetty server
2. Crafting HTTP requests with path traversal sequences targeting administrative endpoints
3. Bypassing authentication controls through the traversal technique
4. Gaining complete administrative access to the server

For detailed technical analysis and exploitation methodology, refer to the Tenable Security Research Advisory.

Detection Methods for CVE-2024-31848

Indicators of Compromise

• HTTP requests containing path traversal sequences such as ../, ..%2f, %2e%2e/, or similar URL-encoded variants targeting the CData API Server
• Unusual access patterns to administrative endpoints from unauthenticated sources
• Log entries showing attempts to access files or directories outside the web application root
• Successful authentication events to administrative interfaces without corresponding legitimate login attempts

Detection Strategies

• Deploy web application firewalls (WAF) with rules to detect and block path traversal patterns in HTTP requests
• Monitor HTTP access logs for requests containing directory traversal sequences or unusual path patterns
• Implement intrusion detection system (IDS) signatures specific to path traversal attacks against Jetty-based applications
• Audit authentication logs for administrative access from unexpected IP addresses or at unusual times

Monitoring Recommendations

• Enable detailed HTTP request logging on CData API Server instances and forward logs to a SIEM solution
• Create alerts for any requests containing ../ patterns or URL-encoded equivalents targeting the API server
• Monitor for changes to administrative configurations or user accounts that cannot be attributed to authorized personnel
• Establish baseline network traffic patterns and alert on anomalies in API server communications

How to Mitigate CVE-2024-31848

Immediate Actions Required

• Upgrade CData API Server to version 23.4.8844 or later immediately
• If immediate patching is not possible, restrict network access to the CData API Server to trusted IP addresses only
• Place the CData API Server behind a reverse proxy or WAF configured to block path traversal patterns
• Review administrative access logs for signs of prior exploitation

Patch Information

CData has addressed this vulnerability in version 23.4.8844 of the API Server. Organizations should upgrade to this version or later to remediate the vulnerability. For detailed information about the vulnerability and remediation, see the Tenable Security Research Advisory.

Workarounds

• Deploy a web application firewall (WAF) in front of the CData API Server with path traversal detection rules enabled
• Implement network segmentation to isolate the CData API Server from untrusted networks
• Configure reverse proxy servers to normalize and validate URL paths before forwarding requests to the API server
• Disable the embedded Jetty server if possible and deploy using an alternative, hardened web server configuration

# Example WAF rule configuration for path traversal prevention
# Deny requests containing common path traversal patterns
# Add to your reverse proxy or WAF configuration

# Block URL-encoded and plain path traversal attempts
SecRule REQUEST_URI "@contains ../" "id:1001,phase:1,deny,status:403,msg:'Path traversal attempt blocked'"
SecRule REQUEST_URI "@contains %2e%2e" "id:1002,phase:1,deny,status:403,msg:'Encoded path traversal blocked'"
SecRule REQUEST_URI "@contains %252e" "id:1003,phase:1,deny,status:403,msg:'Double-encoded traversal blocked'"