CVE-2024-34257
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute arbitrary commands on TOTOLINK EX1800T routers by exploiting the apcliEncrypType parameter. Successful exploitation grants administrator privileges, enabling complete device compromise. Only users of specific TOTOLINK EX1800T firmware versions are affected.
💻 Affected Systems
- TOTOLINK EX1800T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full administrative control over the router, enabling traffic interception, network pivoting, malware deployment, and persistent backdoor installation.
Likely Case
Remote code execution leading to device takeover, credential theft, and network surveillance.
If Mitigated
Limited impact if device is isolated behind firewalls with strict network segmentation and access controls.
🎯 Exploit Status
Public proof-of-concept available in GitHub repositories; exploitation requires network access to the device's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch available. Monitor TOTOLINK website for firmware updates and apply immediately when released.
🔧 Temporary Workarounds
Network Isolation
allPlace affected routers behind firewalls with strict inbound/outbound rules, limiting access to trusted IPs only.
Disable Remote Management
allTurn off remote administration features and ensure web interface is only accessible from internal network.
🧯 If You Can't Patch
- Replace affected devices with patched or alternative models
- Implement strict network segmentation to isolate vulnerable devices from critical assets
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or Administration settings.Check Version:
Login to router web interface and navigate to System Status page.Verify Fix Applied:
Verify firmware version has been updated to a version later than V9.1.0cu.2112_B20220316.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with apcliEncrypType parameter containing shell commands
- Unexpected process execution or configuration changes
Network Indicators:
- HTTP requests with command injection patterns in parameters
- Unusual outbound connections from router
SIEM Query:
http.method:POST AND http.uri:"/cgi-bin/cstecgi.cgi" AND http.param:"apcliEncrypType" AND (http.param:*"|"* OR http.param:*"$"* OR http.param:*";"*)🔗 References
- https://github.com/ZackSecurity/VulnerReport/blob/cve/totolink/EX1800T/1.md
- https://immense-mirror-b42.notion.site/TOTOLINK-EX1800T-has-an-unauthorized-arbitrary-command-execution-vulnerability-2f3e308f5e1d45a2b8a64f198cacc350
- https://github.com/ZackSecurity/VulnerReport/blob/cve/totolink/EX1800T/1.md
- https://immense-mirror-b42.notion.site/TOTOLINK-EX1800T-has-an-unauthorized-arbitrary-command-execution-vulnerability-2f3e308f5e1d45a2b8a64f198cacc350
