CVE-2023-39022
📋 TL;DR
CVE-2023-39022 is a critical code injection vulnerability in oscore v2.2.6 and earlier that allows remote attackers to execute arbitrary code by passing unchecked arguments to the createStateless method. This affects any application using the vulnerable opensymphony oscore library. Attackers can achieve remote code execution with high privileges.
💻 Affected Systems
- opensymphony oscore
📦 What is this software?
Oscore by Oscore
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution leading to data theft, ransomware deployment, or lateral movement across the network.
Likely Case
Remote code execution allowing attackers to install backdoors, steal sensitive data, or use the system as a foothold for further attacks.
If Mitigated
Limited impact if proper input validation and sandboxing are implemented, though the vulnerability still exists.
🎯 Exploit Status
The vulnerability requires passing malicious input to the vulnerable method, which can be done remotely without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.2.7 or later
Vendor Advisory: https://github.com/opensymphony/oscore
Restart Required: Yes
Instructions:
1. Update oscore dependency to version 2.2.7 or later in your project's build configuration (pom.xml for Maven, build.gradle for Gradle). 2. Rebuild and redeploy your application. 3. Restart the application server.
🔧 Temporary Workarounds
Input Validation Wrapper
allImplement strict input validation for all parameters passed to EJBUtils.createStateless method
Implement custom validation layer that sanitizes all inputs before passing to vulnerable method
🧯 If You Can't Patch
- Implement network segmentation to isolate affected systems from critical assets
- Deploy web application firewall (WAF) with rules to detect and block code injection attempts
🔍 How to Verify
Check if Vulnerable:
Check your project's dependency management file (pom.xml, build.gradle) for oscore version 2.2.6 or earlierCheck Version:
mvn dependency:tree | grep oscore (for Maven) or gradle dependencies | grep oscore (for Gradle)Verify Fix Applied:
Verify oscore version is 2.2.7 or later in your dependency files and rebuilt application📡 Detection & Monitoring
Log Indicators:
- Unusual Java class loading, suspicious process creation from Java applications, unexpected network connections from Java processes
Network Indicators:
- Unusual outbound connections from application servers, unexpected payloads in HTTP requests to application endpoints
SIEM Query:
source="application.logs" AND ("EJBUtils.createStateless" OR "oscore" AND "ClassLoader")