CVE-2025-9001
📋 TL;DR
A stack-based buffer overflow vulnerability exists in LemonOS's HTTP client component. Attackers can remotely exploit this by manipulating chunkSize parameters in HTTP requests, potentially allowing arbitrary code execution. This affects LemonOS systems up to nightly-2024-07-12 that use the vulnerable HTTP client.
💻 Affected Systems
- LemonOS
📦 What is this software?
Lemonos by Lemonos
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with system-level privileges, leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Service disruption, denial of service, or limited code execution within the application context.
If Mitigated
Denial of service or application crash if exploit attempts are blocked by security controls.
🎯 Exploit Status
Exploit has been publicly disclosed and may be used. Requires crafting malicious HTTP requests with manipulated chunkSize parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after nightly-2024-07-12
Vendor Advisory: https://github.com/LemonOSProject/LemonOS/issues/60
Restart Required: No
Instructions:
1. Update LemonOS to version after nightly-2024-07-12. 2. Rebuild any applications using the vulnerable HTTP client. 3. Test functionality after update.
🔧 Temporary Workarounds
Disable vulnerable HTTP client
LemonOSRemove or disable the vulnerable HTTP client component if not required
rm /Applications/Steal/main.cpp
Disable any services using this component
Network filtering
allBlock or filter HTTP requests with abnormal chunkSize parameters
Configure WAF rules to reject HTTP requests with chunkSize > [safe_limit]
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy application control to prevent execution of unauthorized code
🔍 How to Verify
Check if Vulnerable:
Check LemonOS version with 'lemonos --version' or examine /etc/os-release. If version is nightly-2024-07-12 or earlier, system is vulnerable.Check Version:
lemonos --version || cat /etc/os-releaseVerify Fix Applied:
Verify LemonOS version is after nightly-2024-07-12. Test HTTP client functionality with normal requests.📡 Detection & Monitoring
Log Indicators:
- HTTP requests with unusually large chunkSize values
- Application crashes in HTTP client component
- Stack overflow errors in system logs
Network Indicators:
- HTTP requests with manipulated Content-Length or Transfer-Encoding headers
- Unusual network traffic to HTTP client ports
SIEM Query:
source="*http*" AND (chunkSize>1000000 OR "stack overflow" OR "buffer overflow")