CVE-2021-2013
📋 TL;DR
This vulnerability in Oracle BI Publisher allows low-privileged attackers with network access via HTTP to compromise the system. Successful exploitation can lead to unauthorized access to critical data, modification of data, and partial denial of service. Affected versions include 5.5.0.0.0, 11.1.1.9.0, 12.2.1.3.0, and 12.2.1.4.0.
💻 Affected Systems
- Oracle BI Publisher
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all Oracle BI Publisher accessible data including unauthorized data access, modification, and partial denial of service.
Likely Case
Unauthorized access to sensitive business intelligence data and reports, potentially leading to data theft or manipulation.
If Mitigated
Limited impact if proper network segmentation, least privilege access controls, and monitoring are implemented.
🎯 Exploit Status
Oracle describes this as 'easily exploitable' with low attack complexity. Requires low privileged access (PR:L) but not authentication bypass.
🛠️ 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 for Oracle Fusion Middleware from Oracle Support. 2. Apply patch to affected BI Publisher instances. 3. Restart BI Publisher services. 4. Verify patch application through version check.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to BI Publisher instances to only trusted IP addresses and networks.
Use firewall rules to limit access: iptables -A INPUT -p tcp --dport <BI_Publisher_port> -s <trusted_network> -j ACCEPT
iptables -A INPUT -p tcp --dport <BI_Publisher_port> -j DROP
Principle of Least Privilege
allReview and minimize user privileges in BI Publisher to reduce attack surface.
Review BI Publisher user roles and permissions
Remove unnecessary privileges from low-privileged accounts
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to BI Publisher instances
- Enhance monitoring and alerting for suspicious activities in BI Publisher access logs
🔍 How to Verify
Check if Vulnerable:
Check BI Publisher version via admin console or version files. Vulnerable if running 5.5.0.0.0, 11.1.1.9.0, 12.2.1.3.0, or 12.2.1.4.0.Check Version:
Check version.xml in BI Publisher installation directory or use admin console version information.Verify Fix Applied:
Verify version is updated beyond affected versions and check patch application status in Oracle documentation.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to BI Publisher security components
- Multiple failed authentication attempts followed by successful low-privilege access
- Unexpected data access or modification events
Network Indicators:
- HTTP requests to BI Publisher security endpoints from unexpected sources
- Traffic patterns indicating data exfiltration
SIEM Query:
source="BI_Publisher_Logs" AND (event_type="security_violation" OR user_privilege="low" AND resource_access="sensitive")