CVE-2024-40695: IBM Cognos Analytics RCE Vulnerability

CVE-2024-40695 Overview

CVE-2024-40695 is an unrestricted file upload vulnerability affecting IBM Cognos Analytics. The flaw stems from insufficient validation of file content submitted through the web interface. Authenticated attackers can upload malicious executable files to the server and deliver them to victims for follow-on attacks. The weakness maps to CWE-434: Unrestricted Upload of File with Dangerous Type.

Affected releases include IBM Cognos Analytics 11.2.0 through 11.2.4 FP4 and 12.0.0 through 12.0.4. IBM has published a security advisory with fixed versions.

Critical Impact
Authenticated attackers can upload arbitrary executable content to Cognos Analytics servers, enabling malware staging, phishing lure delivery, and potential code execution paths against downstream users.

Affected Products

IBM Cognos Analytics 11.2.0 through 11.2.4 FP4
IBM Cognos Analytics 12.0.0 through 12.0.4
Deployments exposing the Cognos web interface to authenticated users

Discovery Timeline

2024-12-20 - CVE-2024-40695 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-40695

Vulnerability Analysis

IBM Cognos Analytics exposes upload functionality through its web interface. The application does not validate the actual content of uploaded files against an allow-list of expected types. An attacker with valid credentials can submit files containing executable payloads such as Windows PE binaries, scripts, or HTML with embedded JavaScript. The server stores these files and makes them available for retrieval.

Exploitation requires network access to the Cognos web interface, low-privilege authentication, and user interaction for the follow-on attack stage. A successful upload can compromise confidentiality, integrity, and availability of the host and any user who retrieves the file.

Root Cause

The root cause is missing content validation on the upload handler. The application relies on client-supplied metadata rather than inspecting the file's magic bytes, MIME type, or structural signature. This gap allows executable content to bypass the intended data-only workflow associated with analytics dashboards and reports.

Attack Vector

An authenticated attacker authenticates to the Cognos Analytics web interface and submits a crafted file through an upload endpoint. The file carries an executable payload disguised with an innocuous extension or content-type header. Once stored on the server, the attacker shares a link with a targeted user. When the victim retrieves and opens the file, the payload executes in the victim's context. Attackers can also chain the upload with server-side interpretation paths if the deployment renders uploaded content.

No verified public proof-of-concept code is available. See the IBM Support Page for vendor guidance.

Detection Methods for CVE-2024-40695

Indicators of Compromise

Uploaded files in Cognos content stores with executable extensions such as .exe, .dll, .js, .hta, .ps1, or double extensions like .pdf.exe
Cognos web server access logs showing POST requests to upload endpoints followed by external GET retrievals from unusual client IPs
Files whose declared MIME type does not match their magic bytes on inspection
Outbound email or messaging traffic containing links to Cognos-hosted files sent to internal victims

Detection Strategies

Inspect uploaded objects with a file-type identification tool and alert on mismatches between declared type and true content
Correlate authenticated Cognos upload events with subsequent file retrieval by different user accounts or IP ranges
Deploy endpoint monitoring to flag execution of binaries whose parent process is a browser handling Cognos URLs
Baseline normal Cognos upload activity by user and department to surface anomalous volume or file types

Monitoring Recommendations

Forward Cognos application logs and web server logs to a centralized analytics platform for retention and query
Alert on any upload where the file signature indicates a Windows PE, ELF, script interpreter, or HTML with embedded scripts
Track user accounts that upload followed by rapid distribution of links, which suggests staged phishing
Monitor endpoints that download from Cognos URLs for subsequent process execution and network beacons

How to Mitigate CVE-2024-40695

Immediate Actions Required

Apply the fixed versions published by IBM for Cognos Analytics 11.2.x and 12.0.x as documented in the vendor advisory
Audit existing content stores for previously uploaded files with executable signatures and quarantine any matches
Restrict Cognos web interface access to trusted network segments and authenticated users with least privilege
Review account activity for the affected versions and rotate credentials for any accounts flagged with anomalous uploads

Patch Information

IBM has released fixes for the affected branches. Refer to the IBM Support Page for CVE-2024-40695 for the specific fix pack levels and download instructions. Administrators should schedule maintenance windows to apply the update and validate report and dashboard functionality after upgrade.

Workarounds

Place a web application firewall in front of Cognos Analytics with rules that block uploads containing executable magic bytes
Enforce mandatory content inspection at the network egress and email gateway for files served from Cognos hostnames
Restrict which user roles can invoke upload functionality until patches are applied
Disable direct file-sharing features in Cognos where business requirements permit

bash

# Example WAF rule concept for blocking PE uploads to Cognos upload endpoints
# Adapt to your WAF syntax (ModSecurity example)
SecRule REQUEST_URI "@contains /bi/v1/disp" \
  "id:1004695,phase:2,deny,status:403,\
   msg:'Blocked executable upload to Cognos (CVE-2024-40695)',\
   chain"
  SecRule REQUEST_BODY "@contains MZ" "t:none"