mirror of
https://github.com/splunk/security_content
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Eric
74 lines
3.2 KiB
YAML
74 lines
3.2 KiB
YAML
name: Web Spring Cloud Function FunctionRouter
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id: 89dddbad-369a-4f8a-ace2-2439218735bc
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version: 5
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date: '2025-05-02'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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description: The following analytic identifies HTTP POST requests to the Spring Cloud
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Function endpoint containing "functionRouter" in the URL. It leverages the Web data
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model to detect these requests based on specific fields such as http_method, url,
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and http_user_agent. This activity is significant because it targets CVE-2022-22963,
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a known vulnerability in Spring Cloud Function, which has multiple proof-of-concept
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exploits available. If confirmed malicious, this activity could allow attackers
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to execute arbitrary code, potentially leading to unauthorized access, data exfiltration,
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or further compromise of the affected system.
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data_source:
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- Splunk Stream HTTP
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search: '| tstats count from datamodel=Web where Web.http_method IN ("POST") Web.url="*/functionRouter*"
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by Web.http_user_agent Web.http_method, Web.url,Web.url_length Web.src, Web.dest
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Web.status sourcetype | `drop_dm_object_name("Web")` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `web_spring_cloud_function_functionrouter_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on Web traffic that include fields relavent for traffic into the `Web` datamodel.
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known_false_positives: False positives may be present with legitimate applications.
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Attempt to filter by dest IP or use Asset groups to restrict to servers.
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references:
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- https://github.com/rapid7/metasploit-framework/pull/16395
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- https://github.com/hktalent/spring-spel-0day-poc
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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: A suspicious URL has been requested against $dest$ by $src$, related to
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a vulnerability in Spring Cloud.
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risk_objects:
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- field: dest
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type: system
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score: 42
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threat_objects:
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- field: src
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type: ip_address
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tags:
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analytic_story:
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- Spring4Shell CVE-2022-22965
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asset_type: Web Server
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cve:
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- CVE-2022-22963
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mitre_attack_id:
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- T1190
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- T1133
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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security_domain: network
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/spring4shell/all_functionrouter_http_streams.log
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source: stream:http
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sourcetype: stream:http
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