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Description

The following analytic detects attempts to exploit CVE-2023-35078, a vulnerability in Ivanti Endpoint Manager Mobile (EPMM) versions up to 11.4. It identifies HTTP requests to the endpoint "/mifs/aad/api/v2/authorized/users?*" with a status code of 200 in web logs. This activity is significant as it indicates unauthorized remote access to restricted functionalities or resources. If confirmed malicious, this could lead to data theft, unauthorized modifications, or further system compromise, necessitating immediate action to mitigate potential severe impacts.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Web
  • Last Updated: 2024-05-18
  • Author: Michael Haag, Splunk
  • ID: 66b9c9ba-7fb2-4e80-a3a2-496e5e078167

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.CM
CIS20
  • CIS 13
CVE 


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| tstats count min(_time) as firstTime max(_time) as lastTime from datamodel=Web where Web.url IN ("/mifs/aad/api/v2/authorized/users?*") Web.status=200 by Web.http_user_agent, Web.status 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)` 
| `ivanti_epmm_remote_unauthenticated_api_access_cve_2023_35078_filter`

Macros

The SPL above uses the following Macros:

:information_source: ivanti_epmm_remote_unauthenticated_api_access_cve-2023-35078_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.

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

How To Implement

To implement this analytic, a network product similar to Suricata or Palo Alto needs to be mapped to the Web datamodel. Modify accordingly to work with your products.

Known False Positives

The Proof of Concept exploit script indicates that status=200 is required for successful exploitation of the vulnerability. False positives may be present if status=200 is removed from the search. If it is removed,then the search also alert on status=301 and status=404 which indicates unsuccessful exploitation attempts. Analysts may find it useful to hunt for these status codes as well, but it is likely to produce a significant number of alerts as this is a widespread vulnerability.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
64.0 80 80 Potential CVE-2023-35078 against an Ivanti EPMM appliance on $dest$.

:information_source: 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

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

source | version: 2