CVE-2025-2493: Sytel Softdial Path Traversal Vulnerability

CVE-2025-2493 Overview

CVE-2025-2493 is a path traversal vulnerability [CWE-22] affecting Sytel Softdial Contact Center. The flaw resides in the /softdial/scheduler/load.php endpoint, where the id parameter is not properly sanitized. An unauthenticated remote attacker can supply traversal sequences to escape the intended directory and read arbitrary files outside the application scope. Successful exploitation exposes sensitive configuration data, credentials, and system files that can support follow-on attacks against the contact center environment.

Critical Impact
Unauthenticated remote attackers can read arbitrary files on hosts running Sytel Softdial Contact Center, exposing configuration, credentials, and operational data.

Affected Products

Sytel Softdial Contact Center
Component: sytel:softdial_contact_center
Endpoint: /softdial/scheduler/load.php

Discovery Timeline

2025-03-18 - CVE-2025-2493 published to NVD
2025-10-21 - Last updated in NVD database

Technical Details for CVE-2025-2493

Vulnerability Analysis

The vulnerability stems from improper neutralization of directory traversal sequences in user-controlled input. The load.php script under the /softdial/scheduler/ path accepts an id parameter that is concatenated into a file path without validation. Attackers send crafted requests containing ../ sequences to traverse outside the scheduler directory and read files anywhere the web server process has read access.

The flaw requires no authentication and no user interaction. It is exploitable over the network using only a standard HTTP client. Disclosed contents commonly include database credentials, session tokens, dialer configuration, and operating system files such as /etc/passwd on Linux deployments.

Root Cause

The application fails to canonicalize or validate the id parameter before passing it to a file inclusion or read routine. Standard mitigations such as realpath() boundary checks, allowlists of legal identifiers, or stripping of .. sequences are absent. This is a textbook violation of [CWE-22] Improper Limitation of a Pathname to a Restricted Directory.

Attack Vector

An attacker issues an HTTP GET request to /softdial/scheduler/load.php with the id parameter set to a relative path containing traversal sequences. The server resolves the path and returns the file contents in the HTTP response. No credentials, tokens, or prior session state are required. Refer to the INCIBE Security Notice for additional technical context.

Detection Methods for CVE-2025-2493

Indicators of Compromise

HTTP requests to /softdial/scheduler/load.php containing ../, ..%2f, or URL-encoded traversal sequences in the id parameter.
Web server access logs showing successful 200 responses to load.php requests with abnormally long or path-like id values.
Outbound responses from the Softdial host containing contents of system files such as /etc/passwd, web.config, or application configuration files.

Detection Strategies

Deploy WAF or IDS signatures that flag traversal patterns (../, ..\\, double-encoded variants) targeting the load.php endpoint.
Hunt across web logs for id= values that include path separators or file extensions inconsistent with legitimate scheduler identifiers.
Correlate suspicious load.php requests with subsequent authentication events to identify credential reuse from leaked configuration files.

Monitoring Recommendations

Enable verbose HTTP logging on the Softdial web tier and forward to a SIEM for retention and pattern analysis.
Monitor file access auditing on the Softdial application directory for reads originating from the web server process outside the scheduler subtree.
Alert on anomalous response sizes from load.php that exceed baseline scheduler payloads.

How to Mitigate CVE-2025-2493

Immediate Actions Required

Restrict network access to the Softdial Contact Center management interface using firewall rules or VPN-only access.
Place the affected endpoint behind a WAF with rules blocking traversal sequences in the id parameter.
Audit web server logs for prior exploitation attempts and rotate any credentials potentially exposed in configuration files.

Patch Information

No vendor patch reference is published in the NVD entry at the time of writing. Operators should contact Sytel Ltd directly for remediation guidance and consult the INCIBE Security Notice for the latest advisory status.

Workarounds

Block external access to /softdial/scheduler/load.php at the reverse proxy or load balancer until a vendor fix is available.
Implement reverse proxy rewrite rules that reject id parameter values containing ., /, \, or URL-encoded equivalents.
Run the Softdial web service under a least-privilege account that cannot read sensitive system or credential files.

bash

# Example nginx rule to block traversal patterns on the vulnerable endpoint
location /softdial/scheduler/load.php {
    if ($arg_id ~* "(\.\./|\.\.\\|%2e%2e|%2f|%5c)") {
        return 403;
    }
    proxy_pass http://softdial_backend;
}