JetBrains TeamCity RCE Attempt

Name:JetBrains TeamCity RCE Attempt
id:89a58e5f-1365-4793-b45c-770abbb32b6c
version:9
date:2026-03-27
author:Michael Haag, Splunk
status:production
type:TTP
Description:The following analytic detects attempts to exploit the CVE-2023-42793 vulnerability in JetBrains TeamCity On-Premises. It identifies suspicious POST requests to /app/rest/users/id:1/tokens/RPC2, leveraging the Web datamodel to monitor specific URL patterns and HTTP methods. This activity is significant as it may indicate an unauthenticated attacker attempting to gain administrative access via Remote Code Execution (RCE). If confirmed malicious, this could allow the attacker to execute arbitrary code, potentially compromising the entire TeamCity environment and leading to further unauthorized access and data breaches.
Data_source:

• -Suricata

search:| tstats `security_content_summariesonly`
count min(_time) as firstTime
max(_time) as lastTime

FROM datamodel=Web WHERE

Web.url="*/app/rest/users/id:1/tokens/RPC2*"
Web.status=200
Web.http_method="POST"

BY Web.http_user_agent Web.status Web.http_method
Web.url Web.url_length Web.src Web.dest

| `drop_dm_object_name("Web")`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `jetbrains_teamcity_rce_attempt_filter`

how_to_implement:The following analytic requires the Web datamodel. Ensure data source is mapped correctly or modify and tune for your data source.
known_false_positives:Requests to this specific endpoint via this method should not be common. Investigate further to determine if the request is legitimate, and apply appropriate filters to reduce false positives.
References:
  -https://blog.jetbrains.com/teamcity/2023/09/critical-security-issue-affecting-teamcity-on-premises-update-to-2023-05-4-now/
  -https://www.sonarsource.com/blog/teamcity-vulnerability/
  -https://github.com/rapid7/metasploit-framework/pull/18408
  -https://attackerkb.com/topics/1XEEEkGHzt/cve-2023-42793/rapid7-analysis
drilldown_searches:
 name:'View the detection results for - "$dest$"'
 search:'%original_detection_search% | search dest = "$dest$"'
 earliest_offset:'$info_min_time$'
 latest_offset:'$info_max_time$'
 name:'View risk events for the last 7 days for - "$dest$"'
 search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
 earliest_offset:'$info_min_time$'
 latest_offset:'$info_max_time$'
tags:
  cve:
    - 'CVE-2023-42793'
  analytic_story:
    - 'JetBrains TeamCity Unauthenticated RCE'
    - 'CISA AA23-347A'
    - 'JetBrains TeamCity Vulnerabilities'
  asset_type:Web Server
  atomic_guid:
  mitre_attack_id:
    - 'T1190'
  product:
    - 'Splunk Enterprise'
    - 'Splunk Enterprise Security'
    - 'Splunk Cloud'
  security_domain:network

tests:
 name:'True Positive Test'
 attack_data:
  data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/jetbrains/teamcity.log
  source: not_applicable
  sourcetype: suricata
manual_test:None