VMware Server Side Template Injection Hunt

Name:VMware Server Side Template Injection Hunt
id:5796b570-ad12-44df-b1b5-b7e6ae3aabb0
version:8
date:None
author:Michael Haag, Splunk
status:production
type:Hunting
Description:The following analytic identifies potential server-side template injection attempts related to CVE-2022-22954. It detects suspicious URL patterns containing "deviceudid" and keywords like "java.lang.ProcessBuilder" or "freemarker.template.utility.ObjectConstructor" using web or proxy logs within the Web Datamodel. This activity is significant as it may indicate an attempt to exploit a known vulnerability in VMware, potentially leading to remote code execution. If confirmed malicious, attackers could gain unauthorized access, execute arbitrary code, and compromise the affected system, posing a severe security risk.
Data_source:

• -Palo Alto Network Threat

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

FROM datamodel=Web WHERE

Web.http_method="GET"
Web.url="*deviceudid=*"
Web.url IN (
"*freemarker.template.utility.ObjectConstructor*",
"*java.lang.ProcessBuilder*"
)
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)`
| `vmware_server_side_template_injection_hunt_filter`

how_to_implement:To successfully implement this search, you need to be ingesting web or proxy logs, or ensure it is being filled by a proxy like device, into the Web Datamodel. For additional filtering, allow list private IP space or restrict by known good.
known_false_positives:False positives may be present if the activity is blocked or was not successful. Filter known vulnerability scanners. Filter as needed.
References:
  -https://www.cisa.gov/uscert/ncas/alerts/aa22-138b
  -https://github.com/wvu/metasploit-framework/blob/master/modules/exploits/linux/http/vmware_workspace_one_access_cve_2022_22954.rb
  -https://github.com/sherlocksecurity/VMware-CVE-2022-22954
  -https://www.vmware.com/security/advisories/VMSA-2022-0011.html
  -https://attackerkb.com/topics/BDXyTqY1ld/cve-2022-22954/rapid7-analysis
  -https://twitter.com/wvuuuuuuuuuuuuu/status/1519476924757778433
drilldown_searches:
  :
analytic_story:['VMware Server Side Injection and Privilege Escalation']

asset_type:Web Server

mitre_attack_id:['T1190', 'T1133']

product:['Splunk Enterprise', 'Splunk Enterprise Security', 'Splunk Cloud']

category:web

security_domain:network

tags:

tests:
 name:'True Positive Test'
 attack_data:
  data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/vmware/vmware_scanning_pan_threat.log
  source: not_applicable
  sourcetype: pan:threat
 test_type:'unit'
manual_test:None