CVE-2024-27265: IBM Integration Bus CSRF Vulnerability

CVE-2024-27265 Overview

CVE-2024-27265 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] affecting IBM Integration Bus for z/OS versions 10.1 through 10.1.0.3. The flaw allows attackers to trick authenticated users into submitting malicious requests that the application processes as trusted actions. IBM tracks this issue as X-Force ID 284564.

Exploitation requires user interaction, typically through a crafted link or webpage visited by an authenticated administrator. Successful attacks can result in unauthorized configuration changes or actions executed under the victim's session context. The vulnerability affects deployments running on z/OS, Linux, and Microsoft Windows platforms.

Critical Impact
An attacker can execute unauthorized state-changing operations on IBM Integration Bus by inducing an authenticated user to visit a malicious page, potentially compromising message flow configurations and integration logic integrity.

Affected Products

IBM Integration Bus for z/OS 10.1 through 10.1.0.3
Deployments on IBM z/OS operating system
Deployments on Linux and Microsoft Windows hosts

Discovery Timeline

2024-03-14 - CVE-2024-27265 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-27265

Vulnerability Analysis

CVE-2024-27265 stems from missing Cross-Site Request Forgery protections in the IBM Integration Bus for z/OS web interface. The application does not sufficiently validate the origin or intent of state-changing HTTP requests. As a result, requests submitted by an authenticated user's browser are processed without verifying that the user deliberately initiated them.

The attack requires network access to the victim and user interaction, but does not require prior authentication by the attacker. The impact centers on integrity: attackers can force administrative actions but cannot directly read sensitive data or trigger denial of service through this flaw alone. Confidentiality and availability impacts are rated as none.

IBM Integration Bus mediates enterprise message flows across heterogeneous systems. Unauthorized configuration changes can propagate through downstream integrations, altering routing, transformation, or connectivity behavior across dependent applications.

Root Cause

The root cause is the absence of anti-CSRF controls such as synchronizer tokens, SameSite cookie attributes, or strict origin validation on state-changing endpoints. Without these controls, the browser automatically attaches session cookies to any request targeting the Integration Bus web interface, regardless of the request's origin.

Attack Vector

An attacker crafts a malicious webpage or email containing HTML or JavaScript that submits forged requests to the Integration Bus administrative interface. When an authenticated administrator visits the attacker-controlled content, the browser transmits the forged requests with valid session credentials attached. The Integration Bus processes the requests as if the administrator initiated them.

Refer to the IBM X-Force Vulnerability #284564 advisory and the IBM Support Document 7140678 for vendor-supplied technical details. No public proof-of-concept exploit is currently available.

Detection Methods for CVE-2024-27265

Indicators of Compromise

Unexpected configuration changes to message flows, execution groups, or broker properties without corresponding change-management records.
HTTP requests to the Integration Bus web console originating with Referer or Origin headers pointing to external, untrusted domains.
Administrative actions logged outside of expected maintenance windows or from atypical client IP addresses.

Detection Strategies

Monitor Integration Bus audit logs for state-changing operations and correlate them with authenticated user sessions and legitimate administrative activity.
Inspect web proxy and reverse-proxy logs for cross-origin requests targeting Integration Bus administrative endpoints.
Enable browser and endpoint telemetry to identify users visiting suspicious sites while logged into internal administrative consoles.

Monitoring Recommendations

Forward Integration Bus and z/OS security logs to a centralized SIEM for correlation with identity and web traffic sources.
Alert on administrative POST or PUT requests lacking expected CSRF tokens or containing unexpected Referer header values.
Track failed and successful configuration changes per user account to detect anomalous administrative behavior.

How to Mitigate CVE-2024-27265

Immediate Actions Required

Apply the IBM-supplied fix referenced in IBM Support Document 7140678 to all IBM Integration Bus 10.1.x through 10.1.0.3 installations.
Restrict access to the Integration Bus administrative interface to trusted management networks and jump hosts.
Require administrators to use dedicated browsers or sessions when accessing the Integration Bus console.

Patch Information

IBM has published remediation guidance in IBM Support Document 7140678. Review the advisory to identify the fix pack or interim fix applicable to your IBM Integration Bus 10.1 deployment and schedule installation according to vendor instructions. Validate patched versions in a non-production environment before production rollout.

Workarounds

Enforce short session lifetimes and require re-authentication before privileged operations on the Integration Bus console.
Configure network controls or reverse proxies to reject cross-origin requests to administrative endpoints based on Origin and Referer headers.
Educate administrators to log out of the Integration Bus web interface when not actively performing management tasks and to avoid concurrent browsing during administrative sessions.

bash

# Example reverse-proxy rule to reject cross-origin requests
# (adjust to your proxy technology and Integration Bus URL path)
if ($http_origin !~* "^https?://iib-admin\.internal\.example\.com$") {
    return 403;
}