CVE-2024-47561
📋 TL;DR
This vulnerability in Apache Avro's Java SDK allows attackers to execute arbitrary code by exploiting schema parsing flaws. It affects all users of Apache Avro versions 1.11.3 and earlier. The vulnerability enables remote code execution when processing malicious schemas.
💻 Affected Systems
- Apache Avro Java SDK
📦 What is this software?
Avro by Apache
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Remote code execution leading to application compromise, data exfiltration, or service disruption.
If Mitigated
Limited impact if proper network segmentation and least privilege principles are implemented, though code execution would still occur.
🎯 Exploit Status
Exploitation requires the attacker to provide a malicious schema to the vulnerable Avro parser. The vulnerability is in the core schema parsing functionality.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.11.4 or 1.12.0
Vendor Advisory: https://lists.apache.org/thread/c2v7mhqnmq0jmbwxqq3r5jbj1xg43h5x
Restart Required: Yes
Instructions:
1. Identify all applications using Apache Avro. 2. Update Avro dependency to version 1.11.4 or 1.12.0 in your build configuration (Maven, Gradle, etc.). 3. Rebuild and redeploy affected applications. 4. Restart services using the updated libraries.
🔧 Temporary Workarounds
Schema Validation Restriction
allImplement strict schema validation and only accept schemas from trusted sources. Reject schemas with unexpected structures or patterns.
Network Controls
allRestrict network access to Avro endpoints and implement input validation for schema parsing operations.
🧯 If You Can't Patch
- Isolate affected systems in network segments with strict egress filtering
- Implement application-level input validation and schema whitelisting
🔍 How to Verify
Check if Vulnerable:
Check your project's dependency files (pom.xml, build.gradle) for Apache Avro version 1.11.3 or earlier. Also check runtime classpath for vulnerable versions.Check Version:
java -cp avro-*.jar org.apache.avro.tool.Main version 2>&1 | grep -i versionVerify Fix Applied:
Verify that Apache Avro version is 1.11.4 or 1.12.0 in your dependencies and that the updated JAR files are deployed.📡 Detection & Monitoring
Log Indicators:
- Unusual schema parsing errors
- Stack traces containing Avro schema parsing classes
- Unexpected process spawns from Java applications
Network Indicators:
- Unusual outbound connections from Avro services
- Malformed schema data in network traffic
SIEM Query:
source="application.logs" AND ("AvroSchemaParser" OR "org.apache.avro.Schema$") AND (error OR exception)