CVE-2021-2435
📋 TL;DR
This vulnerability in Oracle Essbase Analytic Provider Services allows unauthenticated attackers with network access via HTTP to compromise the service. Successful attacks require human interaction from someone other than the attacker and can result in unauthorized creation, deletion, or modification of critical data, as well as unauthorized access to all accessible data. Only version 11.1.2.4 is affected.
💻 Affected Systems
- Oracle Essbase Analytic Provider Services
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Essbase Analytic Provider Services data including unauthorized access to all critical data and ability to create, modify, or delete any data.
Likely Case
Unauthorized access to sensitive business intelligence data and potential data manipulation affecting analytics and reporting.
If Mitigated
Limited impact if proper network segmentation and access controls prevent unauthenticated HTTP access to the service.
🎯 Exploit Status
Requires human interaction from someone other than the attacker, which may limit automated exploitation but doesn't prevent targeted attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patch from Oracle Critical Patch Update July 2021
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2021.html
Restart Required: Yes
Instructions:
1. Download the appropriate patch from My Oracle Support. 2. Stop Essbase services. 3. Apply the patch according to Oracle documentation. 4. Restart Essbase services. 5. Verify the patch was applied successfully.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to Essbase Analytic Provider Services to only trusted IP addresses and networks.
Use firewall rules to limit access: iptables -A INPUT -p tcp --dport <essbase_port> -s <trusted_ip> -j ACCEPT
iptables -A INPUT -p tcp --dport <essbase_port> -j DROP
HTTP to HTTPS Enforcement
allConfigure Essbase to require HTTPS and disable HTTP access if possible.
Configure SSL/TLS in Essbase configuration files and disable HTTP listeners
🧯 If You Can't Patch
- Isolate Essbase Analytic Provider Services on a segmented network with strict access controls.
- Implement web application firewall (WAF) rules to monitor and block suspicious HTTP traffic to the service.
🔍 How to Verify
Check if Vulnerable:
Check if Essbase Analytic Provider Services version 11.1.2.4 is running and accessible via HTTP without authentication.Check Version:
Check Essbase version through administration console or configuration files specific to your deployment.Verify Fix Applied:
Verify the July 2021 Critical Patch Update has been applied by checking patch installation logs or version information.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to Essbase JAPI endpoints
- Authentication bypass attempts
- Unexpected data modification or access patterns
Network Indicators:
- Unusual HTTP traffic to Essbase ports from untrusted sources
- Multiple failed authentication attempts followed by successful access
SIEM Query:
source="essbase" AND (http_method="POST" OR http_method="GET") AND uri CONTAINS "/japi/" AND src_ip NOT IN (trusted_ips)