CVE-2023-42278
📋 TL;DR
CVE-2023-42278 is a buffer overflow vulnerability in hutool's JSONUtil.parse() function that could allow attackers to execute arbitrary code or cause denial of service. This affects applications using vulnerable versions of the hutool Java utility library. Developers and organizations using hutool in their Java applications are impacted.
💻 Affected Systems
- hutool
📦 What is this software?
Hutool by Hutool
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash causing denial of service, potentially leading to business disruption.
If Mitigated
Contained application failure with minimal business impact if proper segmentation and monitoring exist.
🎯 Exploit Status
Exploitation requires crafting malicious JSON input to trigger buffer overflow.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v5.8.22 or later
Vendor Advisory: https://github.com/dromara/hutool/issues/3289
Restart Required: Yes
Instructions:
1. Update hutool dependency to v5.8.22+ in pom.xml or build.gradle. 2. Rebuild and redeploy affected applications. 3. Restart services using the updated library.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation and size limits on JSON data before passing to JSONUtil.parse()
Use alternative JSON parser
allTemporarily replace JSONUtil.parse() calls with a different JSON parsing library like Jackson or Gson
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable applications
- Deploy web application firewall with JSON parsing protection rules
🔍 How to Verify
Check if Vulnerable:
Check project dependencies for hutool version 5.8.21 or earlier in pom.xml, build.gradle, or dependency manifest files.Check Version:
mvn dependency:tree | grep hutool OR gradle dependencies | grep hutoolVerify Fix Applied:
Verify hutool version is 5.8.22 or later in dependency files and confirm successful application rebuild.📡 Detection & Monitoring
Log Indicators:
- Java stack traces containing hutool.JSONUtil
- Application crashes with memory access errors
- Unusually large JSON payloads in request logs
Network Indicators:
- Large JSON payloads to API endpoints
- Repeated requests with malformed JSON
SIEM Query:
source="application_logs" AND ("JSONUtil" OR "hutool") AND ("crash" OR "error" OR "exception")