CVE-2025-3884: Cloudera Hue Path Traversal Vulnerability

CVE-2025-3884 Overview

CVE-2025-3884 is a directory traversal vulnerability in the Cloudera Hue Ace Editor web application. The flaw allows unauthenticated remote attackers to read arbitrary files accessible to the Hue service account. Exploitation requires no privileges, no user interaction, and is reachable over the network. The vulnerability was reported through the Zero Day Initiative as ZDI-CAN-24332 and tracked in advisory ZDI-25-250. The weakness is classified under [CWE-22] (Improper Limitation of a Pathname to a Restricted Directory).

Critical Impact
Unauthenticated remote attackers can disclose sensitive files on affected Cloudera Hue installations, including configuration files and credentials accessible to the Hue service account.

Affected Products

Cloudera Hue 4.11.0
Deployments exposing the Hue Ace Editor web interface
Cloudera data platform components bundling vulnerable Hue versions

Discovery Timeline

2025-05-22 - CVE-2025-3884 published to the National Vulnerability Database
2025-08-15 - Last updated in NVD database

Technical Details for CVE-2025-3884

Vulnerability Analysis

The vulnerability resides in the Ace Editor component embedded in Cloudera Hue. The Ace Editor exposes endpoints that accept user-supplied file path parameters and pass them to file read operations on the server. The application fails to canonicalize and validate these paths before access. As a result, an attacker can submit path traversal sequences such as ../ to escape the intended editor working directory.

A successful request returns file contents in the response body. The disclosed data executes in the context of the Hue service account, which typically has read access to Hue configuration files, Hadoop client credentials, Kerberos keytabs referenced by the service, and other application data. Because authentication is not enforced on the vulnerable path, the attack surface includes any network-reachable Hue instance.

Root Cause

The root cause is improper validation of a user-supplied pathname [CWE-22]. The Ace Editor handler concatenates client-supplied path segments with a base directory and invokes file operations without rejecting traversal tokens or resolving the final path against an allowlist. Missing authentication on the affected endpoint compounds the impact by removing the access control layer that would otherwise restrict who can reach the editor function.

Attack Vector

The attack is performed over the network against the HTTP interface that Hue exposes. An attacker crafts a request to the Ace Editor file-loading endpoint and supplies a relative path containing traversal sequences. The server returns the contents of the targeted file. The Zero Day Initiative advisory ZDI-25-250 documents the flaw and confirms that authentication is not required. See the Zero Day Initiative Advisory ZDI-25-250 for the vendor-coordinated technical reference.

Detection Methods for CVE-2025-3884

Indicators of Compromise

HTTP requests to Hue Ace Editor endpoints containing ../, ..%2f, or encoded traversal sequences in path or query parameters.
Unauthenticated requests reading sensitive paths such as /etc/passwd, /etc/hue/conf/hue.ini, or Kerberos keytab locations.
Spikes in 200 OK responses with large body sizes returned from Ace Editor file-loading endpoints to external IP addresses.

Detection Strategies

Inspect Hue access logs for path parameters containing traversal tokens or absolute paths outside the editor working directory.
Deploy web application firewall rules that block requests to Hue endpoints containing ..%2f, ..%5c, or %2e%2e patterns.
Correlate unauthenticated source IPs accessing Ace Editor paths with subsequent reads of files outside the expected document root.

Monitoring Recommendations

Forward Hue application and web server logs to a centralized SIEM and alert on traversal patterns against Ace Editor URLs.
Monitor outbound data volumes from the Hue service account and flag anomalous file reads of credential or configuration files.
Track network connections to Hue ports from untrusted networks and alert on access attempts from non-corporate IP ranges.

How to Mitigate CVE-2025-3884

Immediate Actions Required

Restrict network access to the Hue web interface using firewall rules, VPN gating, or reverse proxy authentication.
Audit Hue access logs for traversal patterns and review any files that may have been read by unauthenticated clients.
Rotate credentials, tokens, and keytabs stored on the Hue host if log review indicates possible disclosure.

Patch Information

Cloudera has not published a fixed version reference in the NVD data. Administrators should consult Cloudera customer support channels and the Zero Day Initiative Advisory ZDI-25-250 for updated remediation guidance and apply vendor-supplied patches when available.

Workarounds

Place Hue behind an authenticating reverse proxy that blocks access to Ace Editor endpoints for unauthenticated users.
Apply WAF signatures that reject requests containing path traversal sequences against /hue/ URL paths.
Run the Hue service under a least-privilege account that cannot read sensitive system files, credentials, or keytabs outside its required scope.

bash

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