CVE-2023-35965
📋 TL;DR
Two heap-based buffer overflow vulnerabilities in Yifan YF325 router's httpd manage_post functionality allow remote code execution via specially crafted network requests. The integer overflow leads to improper memory allocation, enabling attackers to execute arbitrary code. Affects Yifan YF325 router users running vulnerable firmware.
💻 Affected Systems
- Yifan YF325
📦 What is this software?
Yf325 Firmware by Yifanwireless
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level remote code execution, allowing attacker persistence, data theft, and network pivoting.
Likely Case
Remote code execution leading to router takeover, credential harvesting, and man-in-the-middle attacks on network traffic.
If Mitigated
Denial of service or limited information disclosure if exploit fails to achieve full RCE.
🎯 Exploit Status
Exploit details published in Talos reports; CVSS 9.8 indicates trivial exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No vendor advisory found
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates
2. Download latest firmware
3. Upload via web interface
4. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface from WAN/external networks
Network Segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace vulnerable hardware with supported alternative
- Implement strict network ACLs blocking all traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: if version is v1.0_20221108, system is vulnerableCheck Version:
Check via web interface or SSH if enabled: cat /etc/versionVerify Fix Applied:
Verify firmware version has been updated to a version after v1.0_20221108📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to manage_post endpoint
- Memory allocation errors in system logs
Network Indicators:
- HTTP POST requests with oversized or malformed data to router management port
SIEM Query:
source="router_logs" AND (uri="*manage_post*" AND (content_length>10000 OR status=500))