CVE-2025-3884: Cloudera Hue Information Disclosure Flaw

CVE-2025-3884 Overview

CVE-2025-3884 is a directory traversal vulnerability in the Ace Editor component of Cloudera Hue. The flaw allows unauthenticated remote attackers to read arbitrary files on affected installations. The issue stems from insufficient validation of user-supplied paths used in file operations [CWE-22]. An attacker can disclose sensitive information accessible to the Hue service account, including configuration files, credentials, and application data. The vulnerability was reported through the Zero Day Initiative as ZDI-CAN-24332.

Critical Impact

Unauthenticated remote attackers can read arbitrary files from the Hue server, exposing credentials and configuration data that enable further compromise.

Affected Products

• Cloudera Hue 4.11.0
• Cloudera Hue deployments using the bundled Ace Editor web application
• Installations exposing the Hue web interface to untrusted networks

Discovery Timeline

• 2025-05-22 - CVE-2025-3884 published to NVD
• 2025-08-15 - Last updated in NVD database

Technical Details for CVE-2025-3884

Vulnerability Analysis

The vulnerability resides in the Ace Editor web application bundled with Cloudera Hue. Ace Editor accepts a file path parameter from HTTP requests and passes it to file system operations without sufficient validation. The component fails to canonicalize or restrict path inputs, allowing traversal sequences such as ../ to escape the intended directory.

The issue is exploitable without authentication, meaning any network-reachable attacker can issue crafted requests. File reads occur in the security context of the Hue service account, which typically has access to Hadoop ecosystem configuration, Kerberos keytabs, and database credentials.

The vulnerability has an EPSS score of 9.788% (93rd percentile), indicating elevated likelihood of exploitation activity relative to other published CVEs.

Root Cause

The root cause is improper limitation of a pathname to a restricted directory [CWE-22]. The Ace Editor handler accepts a user-supplied path and uses it directly in file operations without verifying that the resolved path remains within an authorized directory. No allowlist, canonicalization, or sandbox check is applied before opening the file.

Attack Vector

An attacker sends an HTTP request to the Ace Editor endpoint containing a path parameter with traversal sequences. The Hue server resolves the path, opens the target file, and returns its contents in the response. No credentials, user interaction, or prior access is required. Common targets include /etc/passwd, Hue configuration files containing database connection strings, and Hadoop keytab files.

For technical details, see the Zero Day Initiative Advisory ZDI-25-250.

Detection Methods for CVE-2025-3884

Indicators of Compromise

• HTTP requests to Hue Ace Editor endpoints containing ../, ..%2f, or encoded traversal sequences in path parameters
• Access log entries showing reads of sensitive files such as /etc/passwd, /etc/shadow, or Hue configuration files from the Ace Editor handler
• Unexpected file open operations by the Hue service account targeting paths outside the application directory

Detection Strategies

• Inspect Hue web server access logs for path parameters containing traversal patterns or absolute paths to system files
• Deploy web application firewall rules that flag directory traversal payloads against Hue endpoints
• Correlate file access telemetry on the Hue host with inbound HTTP requests to identify reads triggered by Ace Editor

Monitoring Recommendations

• Forward Hue application logs and host file access events to a centralized SIEM for correlation
• Alert on any successful read of credential files, keytabs, or .ini configuration files by the Hue service process
• Monitor outbound network connections from the Hue host that follow suspicious file read activity, which may indicate post-exploitation data exfiltration

How to Mitigate CVE-2025-3884

Immediate Actions Required

• Restrict network access to the Hue web interface to trusted management networks and VPN users only
• Audit Hue access logs for traversal patterns dating back to the deployment of the affected version
• Rotate any credentials, keytabs, or secrets stored on the Hue host that may have been exposed

Patch Information

Apply the security update from Cloudera that addresses CVE-2025-3884 in Cloudera Hue. Refer to the Zero Day Initiative Advisory ZDI-25-250 and Cloudera's security bulletins for the fixed version corresponding to your deployment. Upgrade affected instances of version 4.11.0 to the patched release as the primary remediation.

Workarounds

• Block external access to Ace Editor endpoints at a reverse proxy or web application firewall until patching is complete
• Run the Hue service account with the minimum file system permissions required, removing read access to credential and keytab files where feasible
• Place Hue behind an authenticating reverse proxy to prevent unauthenticated requests from reaching the vulnerable endpoint

# Example NGINX rule to block traversal patterns to Hue Ace Editor
location /hue/ {
    if ($request_uri ~* "(\.\./|\.\.%2f|%2e%2e/)") {
        return 403;
    }
    proxy_pass http://hue_backend;
}