CVE-2020-10721
📋 TL;DR
This vulnerability allows arbitrary code execution when fabric8-maven-plugin processes malicious YAML configuration files during builds. It affects developers and systems using fabric8-maven-plugin 4.0.0+ with wildfly-swarm or thorntail custom configurations. The attacker needs local file access to the build environment.
💻 Affected Systems
- fabric8-maven-plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to execute arbitrary code with the privileges of the Maven process, potentially leading to data theft, system destruction, or lateral movement.
Likely Case
Local privilege escalation or code execution within build pipelines, compromising build artifacts and potentially injecting backdoors into deployed applications.
If Mitigated
Limited impact if proper access controls prevent unauthorized users from placing malicious YAML files in build directories.
🎯 Exploit Status
Exploitation requires local file system access to place malicious YAML file and trigger Maven build with vulnerable configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.5.0
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=1827201
Restart Required: No
Instructions:
1. Update fabric8-maven-plugin dependency in pom.xml to version 4.5.0 or later. 2. Run 'mvn clean install' to rebuild with patched version. 3. Verify no custom YAML configurations contain malicious content.
🔧 Temporary Workarounds
Disable vulnerable configurations
allAvoid using wildfly-swarm or thorntail custom configurations with YAML files until patched.
Modify Maven configuration to use alternative deployment methods
Restrict file permissions
linuxLimit write access to build directories to prevent unauthorized YAML file placement.
chmod 750 build-directory
setfacl -m u:builduser:rwx build-directory
🧯 If You Can't Patch
- Implement strict access controls on build directories to prevent unauthorized file writes
- Use isolated build environments with minimal privileges and monitor for suspicious YAML file modifications
🔍 How to Verify
Check if Vulnerable:
Check pom.xml for fabric8-maven-plugin version 4.0.0-4.4.x and verify if wildfly-swarm/thorntail configurations with YAML files are used.Check Version:
mvn dependency:tree | grep fabric8-maven-pluginVerify Fix Applied:
Confirm fabric8-maven-plugin version is 4.5.0+ in pom.xml and run 'mvn dependency:tree | grep fabric8-maven-plugin'.📡 Detection & Monitoring
Log Indicators:
- Unusual YAML parsing errors in Maven build logs
- Unexpected process execution during Maven builds
Network Indicators:
- Unusual outbound connections from build servers during compilation
SIEM Query:
source="maven.log" AND ("YAML" OR "deserialization") AND error