Ivanti Connect Secure Command Injection Attempts

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Description

This analytic is designed to identify the exploit phase of the CVE-2023-46805 and CVE-2024-21887 vulnerabilities. During this phase, a POST request is made to the /api/v1/totp/user-backup-code/../../system/maintenance/archiving/cloud-server-test-connection URI. This request exploits the command injection vulnerability to execute arbitrary commands. A successful request, indicated by a 200 OK response, suggests that the system is vulnerable.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Web
• Last Updated: 2024-01-17
• Author: Michael Haag, Splunk
• ID: 1f32a7e0-a060-4545-b7de-73fcf9ad536e

Annotations

ATT&CK

ATT&CK

ID	Technique	Tactic
T1190	Exploit Public-Facing Application	Initial Access

Kill Chain Phase

• Delivery

NIST

• DE.CM

CIS20

• CIS 13

CVE

ID	Summary	CVSS
CVE-2023-46805	An authentication bypass vulnerability in the web component of Ivanti ICS 9.x, 22.x and Ivanti Policy Secure allows a remote attacker to access restricted resources by bypassing control checks.	None
CVE-2024-21887	A command injection vulnerability in web components of Ivanti Connect Secure (9.x, 22.x) and Ivanti Policy Secure (9.x, 22.x) allows an authenticated administrator to send specially crafted requests and execute arbitrary commands on the appliance.	None

Search

| tstats count min(_time) as firstTime max(_time) as lastTime from datamodel=Web where Web.url IN("*/api/v1/totp/user-backup-code/../../system/maintenance/archiving/cloud-server-test-connection*","*/api/v1/totp/user-backup-code/../../license/keys-status/*") Web.http_method IN ("POST", "GET") Web.status=200 by Web.src, Web.dest, Web.http_user_agent, Web.url, Web.http_method, Web.status 
| `drop_dm_object_name("Web")` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `ivanti_connect_secure_command_injection_attempts_filter`

Macros

The SPL above uses the following Macros:

• security_content_ctime

ivanti_connect_secure_command_injection_attempts_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.src
• Web.dest
• Web.http_user_agent
• Web.url

How To Implement

This detection requires the Web datamodel to be populated from a supported Technology Add-On like Suricata, Splunk for Apache, Splunk for Nginx, or Splunk for Palo Alto.

Known False Positives

This analytic is limited to HTTP Status 200; adjust as necessary. False positives may occur if the URI path is IP-restricted or externally blocked. It's recommended to review the context of the alerts and adjust the analytic parameters to better fit the specific environment.

Associated Analytic Story

• Ivanti Connect Secure VPN Vulnerabilities

RBA

Risk Score	Impact	Confidence	Message
90.0	100	90	Possible exploitation of CVE-2023-46805 and CVE-2024-21887 against $dest$.

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://github.com/RootUp/PersonalStuff/blob/master/http-vuln-cve2023-46805_2024_21887.nse
• https://github.com/projectdiscovery/nuclei-templates/blob/c6b351e71b0fb0e40e222e97038f1fe09ac58194/http/misconfiguration/ivanti/CVE-2023-46085-CVE-2024-21887-mitigation-not-applied.yaml
• https://github.com/rapid7/metasploit-framework/pull/18708/files
• https://attackerkb.com/topics/AdUh6by52K/cve-2023-46805/rapid7-analysis
• https://labs.watchtowr.com/welcome-to-2024-the-sslvpn-chaos-continues-ivanti-cve-2023-46805-cve-2024-21887/
• https://twitter.com/GreyNoiseIO/status/1747711939466453301

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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