CVE-2016-5074
📋 TL;DR
CVE-2016-5074 is a format string vulnerability in CloudView NMS that allows remote attackers to execute arbitrary code via specially crafted SNMP requests. This affects CloudView NMS versions before 2.10a. Network administrators using vulnerable versions are at risk of complete system compromise.
💻 Affected Systems
- CloudView NMS
📦 What is this software?
Cloudview Nms by Cloudviewnms
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, data theft, and potential lateral movement within the network.
Likely Case
Remote code execution allowing attacker to gain control of the NMS server, potentially disrupting network monitoring and management.
If Mitigated
Denial of service or limited information disclosure if exploit attempts are blocked by network controls.
🎯 Exploit Status
Format string vulnerabilities are well-understood and easily weaponized. Public exploit code exists in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.10a and later
Vendor Advisory: http://www.securityfocus.com/bid/98723
Restart Required: Yes
Instructions:
1. Download CloudView NMS version 2.10a or later from vendor. 2. Backup current configuration. 3. Install the updated version. 4. Restart the CloudView NMS service.
🔧 Temporary Workarounds
Block SNMP Access
linuxRestrict access to CloudView NMS SNMP service using firewall rules
iptables -A INPUT -p udp --dport 161 -j DROP
iptables -A INPUT -p tcp --dport 161 -j DROP
Disable SNMP Service
allTemporarily disable SNMP service in CloudView NMS configuration
Edit CloudView NMS configuration to disable SNMP service
🧯 If You Can't Patch
- Implement strict network segmentation to isolate CloudView NMS from untrusted networks
- Deploy intrusion detection systems to monitor for SNMP-based exploit attempts
🔍 How to Verify
Check if Vulnerable:
Check CloudView NMS version via web interface or configuration file. If version is below 2.10a, system is vulnerable.Check Version:
Check web interface or configuration file for version informationVerify Fix Applied:
Verify version is 2.10a or higher and test SNMP service functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual SNMP request patterns
- Format string error messages in application logs
- Unexpected process execution
Network Indicators:
- Malformed SNMP packets to port 161
- Unusual outbound connections from NMS server
SIEM Query:
source_port=161 AND (payload_contains="%n" OR payload_contains="%s" OR payload_contains="%x")🔗 References
- http://www.securityfocus.com/bid/98723
- https://community.rapid7.com/community/infosec/blog/2016/09/07/multiple-disclosures-for-multiple-network-management-systems-part-2
- http://www.securityfocus.com/bid/98723
- https://community.rapid7.com/community/infosec/blog/2016/09/07/multiple-disclosures-for-multiple-network-management-systems-part-2
