CVE-2024-53703
📋 TL;DR
A stack-based buffer overflow vulnerability in SonicWall SMA100 SSLVPN firmware's mod_httprp library allows remote attackers to potentially execute arbitrary code. This affects SMA100 appliances running firmware version 10.2.1.13-72sv and earlier. Organizations using these VPN appliances for remote access are at risk.
💻 Affected Systems
- SonicWall SMA100 SSLVPN
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker gains full system control, installs persistent backdoors, pivots to internal network, and exfiltrates sensitive data.
Likely Case
Remote code execution leading to VPN appliance compromise, credential theft, and lateral movement into corporate networks.
If Mitigated
Denial of service or system instability if exploit fails or controls block execution.
🎯 Exploit Status
Vulnerability is in Apache module handling HTTP requests, making remote exploitation feasible without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.2.1.14-73sv or later
Vendor Advisory: https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0018
Restart Required: Yes
Instructions:
1. Log into SMA100 management interface. 2. Navigate to System > Settings > Firmware. 3. Upload and install firmware version 10.2.1.14-73sv or later. 4. Reboot appliance after installation completes.
🔧 Temporary Workarounds
Disable SSLVPN Service
allTemporarily disable the vulnerable SSLVPN service until patching can be completed.
Network Segmentation
allRestrict access to SMA100 management interface and SSLVPN service to trusted IP ranges only.
🧯 If You Can't Patch
- Isolate SMA100 appliance in dedicated network segment with strict firewall rules
- Implement WAF or IPS with buffer overflow protection rules in front of appliance
🔍 How to Verify
Check if Vulnerable:
Check firmware version in SMA100 web interface under System > Settings > FirmwareCheck Version:
No CLI command; use web interface at System > Settings > FirmwareVerify Fix Applied:
Confirm firmware version is 10.2.1.14-73sv or later in System > Settings > Firmware📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to mod_httprp endpoints
- Apache process crashes or restarts
- Memory violation errors in system logs
Network Indicators:
- Unusual traffic patterns to SSLVPN service
- Exploit kit signatures targeting CVE-2024-53703
SIEM Query:
source="sonicwall_sma" AND (event_type="process_crash" OR message="*buffer overflow*" OR message="*mod_httprp*")