CVE-2025-55057: Maxum Rumpus CSRF Vulnerability

CVE-2025-55057 Overview

CVE-2025-55057 is a Cross-Site Request Forgery (CSRF) vulnerability affecting Maxum Rumpus version 9.0.12. The flaw is tracked under CWE-352 and stems from multiple application endpoints that fail to validate the origin or intent of authenticated requests. An attacker who tricks an authenticated administrator into visiting a malicious page can cause the browser to issue state-changing requests against the Rumpus server. The CVSS vector indicates network-based exploitation with user interaction required and high impact across confidentiality, integrity, and availability.

Critical Impact
Successful exploitation lets an attacker perform administrative actions in Maxum Rumpus on behalf of an authenticated user, leading to full compromise of the file transfer server.

Affected Products

Maxum Rumpus 9.0.12
CPE: cpe:2.3:a:maxum:rumpus:9.0.12
Vendor: Maxum Development

Discovery Timeline

2025-11-17 - CVE-2025-55057 published to NVD
2025-11-24 - Last updated in NVD database

Technical Details for CVE-2025-55057

Vulnerability Analysis

The vulnerability resides in multiple HTTP endpoints exposed by the Rumpus management interface. These endpoints accept state-changing POST or GET requests without verifying an anti-CSRF token or validating the request origin. When an authenticated administrator visits an attacker-controlled web page, the browser automatically attaches the active Rumpus session cookie to any cross-origin request issued by that page. The Rumpus server processes the request as if it came from the legitimate administrator. Because the affected endpoints include configuration and account-management functions, the impact extends beyond simple data modification.

Root Cause

The root cause is missing CSRF protection on sensitive endpoints. The application does not implement synchronizer tokens, double-submit cookies, or SameSite cookie enforcement. It also does not verify Origin or Referer headers before executing privileged actions. Multiple endpoints share this flaw, which broadens the attack surface.

Attack Vector

Exploitation requires an attacker to host a malicious page containing an auto-submitting form or scripted request targeting the victim Rumpus server. The attacker then lures an authenticated administrator to that page through phishing or a watering-hole technique. When the page loads, the victim's browser issues the forged request with valid session credentials. Typical CSRF payloads create new administrative accounts, alter file-sharing permissions, or modify server configuration to enable later remote code execution paths.

No verified proof-of-concept code is publicly available for CVE-2025-55057. See the Israeli Government CVE Advisories for additional technical context.

Detection Methods for CVE-2025-55057

Indicators of Compromise

Unexpected administrative account creation or privilege changes in the Rumpus user database.
HTTP requests to Rumpus admin endpoints carrying external Referer or Origin headers that do not match the server hostname.
Configuration changes to file-sharing rules, FTP listeners, or web interface settings outside of approved change windows.
Authenticated administrator sessions issuing rapid sequential state-changing requests inconsistent with normal UI workflows.

Detection Strategies

Inspect Rumpus web server access logs for POST requests to administrative paths where the Referer header points to an untrusted domain.
Alert on browser navigation events from administrator workstations to suspicious URLs immediately preceding configuration changes on the Rumpus host.
Correlate endpoint telemetry from administrator workstations with Rumpus server-side audit events to identify forged-request patterns.

Monitoring Recommendations

Centralize Rumpus access and audit logs into a SIEM and apply detections for cross-origin administrative actions.
Monitor for newly created administrator accounts, share definitions, and authentication policy changes.
Track outbound HTTP requests from admin workstations to newly registered or low-reputation domains.

How to Mitigate CVE-2025-55057

Immediate Actions Required

Restrict access to the Rumpus administrative interface to trusted management networks or VPN segments only.
Require administrators to use a dedicated browser profile for managing Rumpus and to log out immediately after use.
Review existing accounts, shares, and server configuration for unauthorized changes prior to remediation.
Audit recent Rumpus logs for evidence of CSRF-style request patterns.

Patch Information

No vendor patch URL is listed in the public CVE data at the time of writing. Administrators running Maxum Rumpus 9.0.12 should contact Maxum Development for an updated build addressing CWE-352 and monitor the Israeli Government CVE Advisories for additional information.

Workarounds

Enforce SameSite=Strict or SameSite=Lax attributes on Rumpus session cookies at a reverse proxy if not configurable in the application.
Place Rumpus behind a reverse proxy that validates Origin and Referer headers on state-changing requests to administrative paths.
Require administrators to authenticate through a separate session that is not active during routine browsing.
Disable or firewall the web administration interface when not actively in use.

bash

# Example nginx reverse proxy snippet enforcing Origin header on admin paths
location /admin/ {
    if ($request_method = POST) {
        set $valid_origin 0;
        if ($http_origin = "https://rumpus.internal.example.com") {
            set $valid_origin 1;
        }
        if ($valid_origin = 0) {
            return 403;
        }
    }
    proxy_pass http://rumpus_backend;
}