VMware Server Side Template Injection Hunt

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Description

The following hunting analytic identifies the server side template injection related to CVE-2022-22954, however is a variation found within the same endpoint of the URL scheme.

• Type: Hunting
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Web
• Last Updated: 2022-05-19
• Author: Michael Haag, Splunk
• ID: 5796b570-ad12-44df-b1b5-b7e6ae3aabb0

Annotations

ATT&CK

ATT&CK

ID	Technique	Tactic
T1190	Exploit Public-Facing Application	Initial Access

T1133

External Remote Services

Persistence, Initial Access

Kill Chain Phase

• Delivery
• Installation

NIST

• DE.AE

CIS20

• CIS 13

CVE

ID	Summary	CVSS
CVE-2022-22954	VMware Workspace ONE Access and Identity Manager contain a remote code execution vulnerability due to server-side template injection. A malicious actor with network access can trigger a server-side template injection that may result in remote code execution.	10.0

Search

| tstats count from datamodel=Web where Web.http_method IN ("GET") Web.url="*deviceudid=*" AND Web.url IN ("*java.lang.ProcessBuilder*","*freemarker.template.utility.ObjectConstructor*") by Web.http_user_agent Web.http_method, Web.url,Web.url_length Web.src, Web.dest sourcetype 
| `drop_dm_object_name("Web")` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `vmware_server_side_template_injection_hunt_filter`

Macros

The SPL above uses the following Macros:

• security_content_ctime

vmware_server_side_template_injection_hunt_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

• Web.http_method
• Web.url
• Web.url_length
• Web.src
• Web.dest
• Web.http_user_agent

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 vulnerablity scanners. Filter as needed.

Associated Analytic Story

• VMware Server Side Injection and Privilege Escalation

RBA

Risk Score	Impact	Confidence	Message
35.0	70	50	An attempt to exploit a VMware Server Side Injection CVE-2022-22954 on $dest$ has occurred.

The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

• 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

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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