security_content/detections/web/web_spring_cloud_function_functionrouter.yml at develop · jsmerkel/security_content · GitHub

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name: Web Spring Cloud Function FunctionRouter
id: 89dddbad-369a-4f8a-ace2-2439218735bc
version: 1
date: '2022-04-05'
author: Michael Haag, Splunk
type: TTP
datamodel:
- Web
description: The following analytic identifies activity related to the web application Spring Cloud Function that was recently idenfied as vulnerable. This is CVE-2022-22963.
  Multiple proof of concept code was released.
  The URI that is hit includes `functionrouter`. The specifics of the exploit include a status of 500. In this query we did not include it, but for filtering you can add Web.status=500.
  The exploit data itself (based on all the POCs) is located in the form_data field. This field will include all class.modules being called.
search: '| tstats count from datamodel=Web where Web.http_method IN ("POST") Web.url="*/functionRouter*"
  by Web.http_user_agent Web.http_method, Web.url,Web.url_length Web.src, Web.dest Web.status sourcetype
  | `drop_dm_object_name("Web")`
  | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)`
  | `web_spring_cloud_function_functionrouter_filter`'
how_to_implement: To successfully implement this search you need to be ingesting information on Web traffic that include fields relavent for traffic into the `Web` datamodel.
known_false_positives: False positives may be present with legitimate applications. Attempt to filter by dest IP or use Asset groups to restrict to servers.
references:
- https://github.com/rapid7/metasploit-framework/pull/16395
- https://github.com/hktalent/spring-spel-0day-poc
tags:
  analytic_story:
  - Spring4Shell CVE-2022-22965
  cve:
  - CVE-2022-22963
  asset_type: Web Server
  cis20:
  - CIS 3
  - CIS 5
  - CIS 16
  confidence: 60
  context:
  - Scope:Network
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/spring4shell/all_functionrouter_http_streams.log
  impact: 70
  kill_chain_phases:
  - Exploitation
  message: A suspicious URL has been requested against $dest$ by $src$, related to a vulnerability in Spring Cloud.
  mitre_attack_id:
  - T1190
  nist:
  - DE.CM
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: src
    type: IP Address
    role:
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Web.http_method
  - Web.url
  - Web.url_length
  - Web.src
  - Web.dest
  - Web.http_user_agent
  risk_score: 42
  security_domain: network