CVE-2022-45491
📋 TL;DR
This is a buffer overflow vulnerability in the json_parse_value function of the sheredom json.h library. It allows attackers to execute arbitrary code and potentially gain escalated privileges on systems using vulnerable versions. Any application or system that incorporates this JSON parsing library is affected.
💻 Affected Systems
- sheredom json.h library
- Applications using sheredom json.h
📦 What is this software?
Json.h by Json.h Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, privilege escalation, and attacker persistence.
Likely Case
Application crash (denial of service) or limited code execution within the application context.
If Mitigated
Application crash with no code execution if memory protections (ASLR, DEP) are effective.
🎯 Exploit Status
Buffer overflow vulnerabilities in parsing libraries are commonly exploited. Public advisory includes technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit 0825301a07cbf51653882bf2b153cc81fdadf41 or later
Vendor Advisory: https://github.com/hyrathon/trophies/security/advisories/GHSA-55fm-gm4m-3v3j
Restart Required: Yes
Instructions:
1. Update json.h to commit 0825301a07cbf51653882bf2b153cc81fdadf41 or later. 2. Recompile any applications using the library. 3. Restart affected services.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation and size limits on JSON data before parsing.
Memory Protection
allEnable ASLR, DEP, and stack canaries if not already enabled.
🧯 If You Can't Patch
- Network segmentation to isolate vulnerable systems
- Implement strict firewall rules to limit access to vulnerable services
🔍 How to Verify
Check if Vulnerable:
Check the json.h version in your source code or compiled application against the vulnerable commit range.Check Version:
git log --oneline | grep -i json.h (if using git) or check source file headersVerify Fix Applied:
Verify json.h includes commit 0825301a07cbf51653882bf2b153cc81fdadf41 or later.📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Unexpected process termination
Network Indicators:
- Unusual network traffic to/from JSON parsing services
SIEM Query:
source="application.log" (segfault OR "buffer overflow" OR "json_parse_value")