CVE-2025-53047
📋 TL;DR
This vulnerability allows unauthenticated attackers with network access via Bonjour to read sensitive data from Oracle Database Server's Portable Clusterware component. It affects Oracle Database Server versions 19.3-19.28, 21.3-21.19, and 23.4-23.9. While the vulnerability is in Portable Clusterware, successful exploitation can impact additional products due to scope change.
💻 Affected Systems
- Oracle Database Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Unauthorized access to sensitive clusterware configuration data, potentially exposing credentials, network configurations, or database connection information that could facilitate further attacks.
Likely Case
Exposure of non-critical clusterware metadata or configuration details that could aid reconnaissance for more targeted attacks.
If Mitigated
Limited exposure of low-sensitivity information with no path to privilege escalation or system compromise.
🎯 Exploit Status
CVSS indicates 'easily exploitable' with no authentication required via network access to Bonjour service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update October 2025
Vendor Advisory: https://www.oracle.com/security-alerts/cpuoct2025.html
Restart Required: No
Instructions:
1. Download appropriate patches from My Oracle Support. 2. Apply patches according to Oracle's patching procedures. 3. Verify patch application using opatch utility.
🔧 Temporary Workarounds
Block Bonjour network access
allRestrict network access to Bonjour services (mDNS on UDP port 5353) using firewall rules
iptables -A INPUT -p udp --dport 5353 -j DROP
firewall-cmd --permanent --add-rich-rule='rule protocol value="udp" port port="5353" reject'
Disable Bonjour service
linuxDisable mDNS/Bonjour service if not required for cluster operations
systemctl stop avahi-daemon
systemctl disable avahi-daemon
🧯 If You Can't Patch
- Implement strict network segmentation to isolate database servers from untrusted networks
- Deploy network monitoring and IDS/IPS rules to detect and block suspicious Bonjour traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check Oracle Database version with 'sqlplus / as sysdba' then 'SELECT * FROM v$version;' and verify if within affected ranges.Check Version:
sqlplus / as sysdba <<< "SELECT * FROM v$version;"Verify Fix Applied:
Verify patch application using 'opatch lsinventory' and check for October 2025 CPU patches.📡 Detection & Monitoring
Log Indicators:
- Unusual Bonjour/mDNS traffic patterns
- Unexpected network connections to UDP port 5353 from external sources
Network Indicators:
- Excessive Bonjour queries to database servers
- Unusual mDNS traffic from non-trusted sources
SIEM Query:
source_port=5353 OR dest_port=5353 AND (src_ip NOT IN trusted_networks OR dest_ip IN database_servers)