CVE-2019-2725
📋 TL;DR
CVE-2019-2725 is a critical deserialization vulnerability in Oracle WebLogic Server's Web Services component that allows unauthenticated remote attackers to execute arbitrary code. It affects WebLogic Server versions 10.3.6.0.0 and 12.1.3.0.0, potentially leading to complete server compromise. This vulnerability is easily exploitable via HTTP requests without authentication.
💻 Affected Systems
- Oracle WebLogic Server
📦 What is this software?
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Communications Converged Application Server by Oracle
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⚠️ Risk & Real-World Impact
Worst Case
Complete takeover of WebLogic Server with full administrative control, data exfiltration, lateral movement within network, and persistent backdoor installation.
Likely Case
Remote code execution leading to cryptocurrency mining, ransomware deployment, or data theft from vulnerable servers.
If Mitigated
Limited impact with proper network segmentation, but still significant risk if WebLogic is internet-facing.
🎯 Exploit Status
Multiple public exploits available; widely used in real attacks including cryptocurrency mining campaigns and ransomware deployment.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available in Oracle Critical Patch Update Advisory - July 2019
Vendor Advisory: http://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
Restart Required: Yes
Instructions:
1. Download and apply the appropriate patch from Oracle Support. 2. Apply the out-of-band patch for CVE-2019-2725. 3. Restart WebLogic Server instances. 4. Verify patch application through version checks.
🔧 Temporary Workarounds
Remove vulnerable Web Services components
linuxDelete or rename the wls9_async_response.war and wls-wsat.war files to disable vulnerable endpoints
cd $DOMAIN_HOME/servers/AdminServer/tmp/_WL_internal
rm -rf wls9_async_response* wls-wsat*
cd $DOMAIN_HOME/servers/AdminServer/tmp/.internal
rm -rf wls9_async_response* wls-wsat*
Remove vulnerable Web Services components (Windows)
windowsDelete or rename the wls9_async_response.war and wls-wsat.war files to disable vulnerable endpoints
cd %DOMAIN_HOME%\servers\AdminServer\tmp\_WL_internal
del /s /q wls9_async_response* wls-wsat*
cd %DOMAIN_HOME%\servers\AdminServer\tmp\.internal
del /s /q wls9_async_response* wls-wsat*
🧯 If You Can't Patch
- Implement strict network access controls to limit WebLogic Server access to trusted IPs only
- Deploy Web Application Firewall (WAF) with rules to block deserialization attacks and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if /_async/* and /wls-wsat/* endpoints respond to HTTP requests; presence indicates potential vulnerabilityCheck Version:
$ORACLE_HOME/OPatch/opatch lsinventory | grep -i weblogicVerify Fix Applied:
Verify patch is applied via Oracle OPatch utility and that vulnerable endpoints no longer respond📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /_async/* or /wls-wsat/* endpoints
- Java deserialization errors in WebLogic logs
- Unexpected process creation or network connections
Network Indicators:
- HTTP POST requests containing serialized Java objects to WebLogic endpoints
- Unusual outbound connections from WebLogic servers
SIEM Query:
source="weblogic.log" AND ("_async" OR "wls-wsat") AND (POST OR "deserialization" OR "ClassNotFoundException")🔗 References
- http://packetstormsecurity.com/files/152756/Oracle-Weblogic-Server-Deserialization-Remote-Code-Execution.html
- http://www.oracle.com/technetwork/security-advisory/alert-cve-2019-2725-5466295.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- http://www.securityfocus.com/bid/108074
- https://support.f5.com/csp/article/K90059138
- https://www.exploit-db.com/exploits/46780/
- https://www.oracle.com/security-alerts/alert-cve-2019-2725.html#AppendixFMW
- https://www.oracle.com/security-alerts/cpujan2020.html
- http://packetstormsecurity.com/files/152756/Oracle-Weblogic-Server-Deserialization-Remote-Code-Execution.html
- http://www.oracle.com/technetwork/security-advisory/alert-cve-2019-2725-5466295.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- http://www.securityfocus.com/bid/108074
- https://support.f5.com/csp/article/K90059138
- https://www.exploit-db.com/exploits/46780/
- https://www.oracle.com/security-alerts/alert-cve-2019-2725.html#AppendixFMW
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-2725
