CVE-2021-2114
📋 TL;DR
This vulnerability in Oracle Common Applications Calendar allows unauthenticated attackers to access sensitive data and modify information via HTTP requests. It affects Oracle E-Business Suite versions 12.1.1-12.1.3 and 12.2.3-12.2.10. Successful exploitation requires human interaction from someone other than the attacker.
💻 Affected Systems
- Oracle Common Applications Calendar
- Oracle E-Business Suite
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all Oracle Common Applications Calendar data including unauthorized access to critical information and ability to modify, insert, or delete data across the entire system.
Likely Case
Unauthorized access to sensitive calendar data and limited ability to modify or delete calendar entries, potentially affecting business operations and confidentiality.
If Mitigated
Limited impact with proper network segmentation, strong authentication controls, and user awareness training to prevent social engineering.
🎯 Exploit Status
CVSS indicates 'easily exploitable' with network access via HTTP and requires user interaction (UI:R). No public exploit code identified in references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update January 2021 or later
Vendor Advisory: https://www.oracle.com/security-alerts/cpujan2021.html
Restart Required: Yes
Instructions:
1. Download Critical Patch Update January 2021 from Oracle Support. 2. Apply patch to affected Oracle E-Business Suite installations. 3. Restart affected services. 4. Test functionality after patching.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to Oracle E-Business Suite to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Web Application Firewall
allDeploy WAF with rules to block suspicious HTTP requests to calendar endpoints
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Disable Oracle Common Applications Calendar component if not required
🔍 How to Verify
Check if Vulnerable:
Check Oracle E-Business Suite version and verify if Common Applications Calendar component is installed and activeCheck Version:
SELECT RELEASE_NAME FROM FND_PRODUCT_GROUPS;Verify Fix Applied:
Verify Critical Patch Update January 2021 is applied and check version numbers against patched versions📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to calendar endpoints from unauthenticated sources
- Multiple failed authentication attempts followed by calendar data access
Network Indicators:
- HTTP traffic to /OA_HTML/*calendar* endpoints from unexpected sources
- Unusual data extraction patterns from calendar APIs
SIEM Query:
source="oracle-ebs" AND (uri="*calendar*" OR uri="*Calendar*") AND (src_ip NOT IN trusted_networks) AND response_code=200