CVE-2014-9693
📋 TL;DR
This vulnerability in multiple Huawei Tecal server models allows attackers to execute arbitrary code or cause system restarts by sending specially crafted DNS packets. It affects numerous Huawei server products running specific firmware versions. The high CVSS score of 9.8 indicates critical severity with network-accessible attack vectors.
💻 Affected Systems
- Huawei Tecal RH1288 V2
- Tecal RH2265 V2
- Tecal RH2285 V2
- Tecal RH2285H V2
- Tecal RH2268 V2
- Tecal RH2288 V2
- Tecal RH2288H V2
- Tecal RH2485 V2
- Tecal RH5885 V2
- Tecal RH5885 V3
- Tecal RH5885H V3
- Tecal XH310 V2
- Tecal XH311 V2
- Tecal XH320 V2
- Tecal XH621 V2
- Tecal DH310 V2
- Tecal DH320 V2
- Tecal DH620 V2
- Tecal DH621 V2
- Tecal DH628 V2
- Tecal BH620 V2
- Tecal BH621 V2
- Tecal BH622 V2
- Tecal BH640 V2
- Tecal CH121
- Tecal CH140
- Tecal CH220
- Tecal CH221
- Tecal CH222
- Tecal CH240
- Tecal CH242
- Tecal CH242 V3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level arbitrary code execution leading to data theft, system destruction, or persistent backdoor installation.
Likely Case
System crashes and restarts causing service disruption and potential data corruption, with possible remote code execution in vulnerable configurations.
If Mitigated
Limited impact if systems are patched, isolated from untrusted networks, or have DNS services disabled.
🎯 Exploit Status
Attack requires sending crafted DNS packets to vulnerable systems. No authentication needed. No public exploit code found in available references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after those listed in the CVE description (e.g., for RH1288 V2: later than V100R002C00SPC107)
Vendor Advisory: http://www.huawei.com/en/psirt/security-advisories/hw-408100
Restart Required: Yes
Instructions:
1. Check current firmware version. 2. Download appropriate firmware update from Huawei support portal. 3. Apply firmware update following Huawei documentation. 4. Reboot system to activate new firmware.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict DNS traffic to trusted sources only using firewall rules
iptables -A INPUT -p udp --dport 53 -s trusted_dns_server -j ACCEPT
iptables -A INPUT -p udp --dport 53 -j DROP
Disable Unnecessary DNS Services
linuxTurn off DNS resolver services if not required for system operation
systemctl stop systemd-resolved
systemctl disable systemd-resolved
🧯 If You Can't Patch
- Isolate affected systems in separate network segments with strict firewall rules blocking external DNS traffic
- Implement network monitoring for anomalous DNS packets and system restart patterns
🔍 How to Verify
Check if Vulnerable:
Check firmware version via Huawei iBMC or similar management interface and compare against affected versions listed in CVECheck Version:
Specific commands vary by model - typically accessed via iBMC web interface or SSH to management interfaceVerify Fix Applied:
Verify firmware version has been updated to a version beyond those listed in the CVE description📡 Detection & Monitoring
Log Indicators:
- Unexpected system restarts
- DNS service crashes
- Memory corruption errors in system logs
Network Indicators:
- Unusual DNS packet patterns to server management interfaces
- DNS traffic from unexpected sources
SIEM Query:
source="*dns*" AND (event_type="crash" OR event_type="restart") AND dest_ip="affected_server_ip"