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6.23 - Spring4Shell vulnerability exploit attempts (CVE-2022-22965)

Detect subset of Spring4Shell vulnerability (CVE-2022-22965) exploit attempts against any of your internet-facing applications sitting behind HTTP(S) Load Balancer. This detection inspects URL and query string only; it is not meant to be exhaustive of all variants of this exploit.

Category: Network Activity
Use Cases: Detect
Data Sources: HTTP(S) LB Logs

Queries or Rules

BigQuery Chronicle Log Analytics
SQL YARA-L Contribute query

Event Generation

No event generation steps provided. Contribute emulation test to this use case.

Sample Event

google.cloud.loadbalancing.type.LoadBalancerLogEntry-Spring4Shell

{
  "insertId": "op1da3f1iheiv",
  "jsonPayload": {
    "statusDetails": "handled_by_identity_aware_proxy",
    "@type": "type.googleapis.com/google.cloud.loadbalancing.type.LoadBalancerLogEntry"
  },
  "httpRequest": {
    "requestMethod": "POST",
    "requestUrl": "https://203.0.113.255/path?class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp",
    "requestSize": "176",
    "status": 401,
    "responseSize": "256",
    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36",
    "remoteIp": "192.158.1.38",
    "latency": "0.173624s"
  },
  "resource": {
    "type": "http_load_balancer",
    "labels": {
      "zone": "global",
      "url_map_name": "my-application-lb-map",
      "forwarding_rule_name": "my-application-lb-fwd-rule",
      "project_id": "1234",
      "target_proxy_name": "my-application-lb-proxy",
      "backend_service_name": "my-application-backend-service"
    }
  },
  "timestamp": "2022-04-02T00:34:29.860280Z",
  "severity": "WARNING",
  "logName": "projects/1234/logs/requests",
  "trace": "projects/1234/traces/9811415033b66a1320f760e091b1ef57",
  "receiveTimestamp": "2022-04-02T00:34:31.577704203Z",
  "spanId": "b648b79bed5f941e"
}

References