mirror of
https://github.com/splunk/security_content
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Eric
73 lines
3.4 KiB
YAML
73 lines
3.4 KiB
YAML
name: Web Remote ShellServlet Access
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id: c2a332c3-24a2-4e24-9455-0e80332e6746
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version: 6
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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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data_source:
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- Nginx Access
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description: The following analytic identifies attempts to access the Remote ShellServlet
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on a web server, specifically targeting Confluence servers vulnerable to CVE-2023-22518
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and CVE-2023-22515. It leverages web data to detect URLs containing "*plugins/servlet/com.jsos.shell/*"
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with a status code of 200. This activity is significant as it is commonly associated
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with web shells and other malicious behaviors, potentially leading to unauthorized
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command execution. If confirmed malicious, attackers could gain remote code execution
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capabilities, compromising the server and potentially the entire network.
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search: '| tstats count min(_time) as firstTime max(_time) as lastTime from datamodel=Web
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where Web.url IN ("*plugins/servlet/com.jsos.shell/*") Web.status=200 by Web.http_user_agent,
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Web.status Web.http_method, Web.url, Web.url_length, Web.src, Web.dest, sourcetype
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| `drop_dm_object_name("Web")` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `web_remote_shellservlet_access_filter`'
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how_to_implement: This analytic necessitates the collection of web data, which can
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be achieved through Splunk Stream or by utilizing the Splunk Add-on for Apache Web
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Server. No additional configuration is required for this analytic.
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known_false_positives: False positives may occur depending on the web server's configuration.
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If the web server is intentionally configured to utilize the Remote ShellServlet,
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then the detections by this analytic would not be considered true positives.
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references:
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- http://www.servletsuite.com/servlets/shell.htm
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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: An attempt to access the Remote ShellServlet on a web server was detected.
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The source IP is $src$ and the destination hostname is $dest$.
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risk_objects:
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- field: dest
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type: system
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score: 81
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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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- CVE-2023-22515 Privilege Escalation Vulnerability Confluence Data Center and Server
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asset_type: Web Server
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atomic_guid: []
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mitre_attack_id:
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- T1190
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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/confluence/nginx_shellservlet.log
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source: /var/log/nginx/access.log
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sourcetype: nginx:plus:kv
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