CVE-2024-1708 - ScreenConnect Path Traversal Exploitation - Security

This detects file modifications to ASPX and ASHX files within the root of the App_Extensions directory, which is allowed by a ZipSlip vulnerability in versions prior to 23.9.8. This occurs during exploitation of CVE-2024-1708. This requires an Advanced Auditing policy to log a successful Windows Event ID 4663 events and with a SACL set on the directory.

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Detection logic

selection

EventID: 4663
ObjectType: File
ProcessName|contains: ScreenConnect.Service.exe
AccessMask: "0x6"
ObjectName|endswith:
  - ScreenConnect\\App_Extensions\\*.ashx
  - ScreenConnect\\App_Extensions\\*.aspx

filter_main_legit_extension

ObjectName|contains: ScreenConnect\App_Extensions\\*\\

Condition

selection and not 1 of filter_main_*

Raw YAML

title: CVE-2024-1708 - ScreenConnect Path Traversal Exploitation - Security
id: 4c198a60-7d05-4daf-8bf7-4136fb6f5c62
related:
    - id: 44d7af7e-88e6-4490-be11-55f7ff4d9fc1
      type: similar
status: test
description: |
    This detects file modifications to ASPX and ASHX files within the root of the App_Extensions directory, which is allowed by a ZipSlip vulnerability in versions prior to 23.9.8. This occurs during exploitation of CVE-2024-1708.
    This requires an Advanced Auditing policy to log a successful Windows Event ID 4663 events and with a SACL set on the directory.
references:
    - https://www.connectwise.com/company/trust/security-bulletins/connectwise-screenconnect-23.9.8
    - https://www.cve.org/CVERecord?id=CVE-2024-1708
    - https://www.huntress.com/blog/a-catastrophe-for-control-understanding-the-screenconnect-authentication-bypass
author: Matt Anderson, Caleb Stewart, Huntress
date: 2024-02-20
tags:
    - attack.initial-access
    - attack.persistence
    - cve.2024-1708
    - detection.emerging-threats
logsource:
    product: windows
    service: security
    definition: 'Requirements: SACLs must be enabled for the ScreenConnect directory'
detection:
    selection:
        EventID: 4663
        ObjectType: 'File'
        ProcessName|contains: 'ScreenConnect.Service.exe'
        AccessMask: '0x6'
        ObjectName|endswith:
            - 'ScreenConnect\\App_Extensions\\*.ashx'
            - 'ScreenConnect\\App_Extensions\\*.aspx'
    filter_main_legit_extension:
        ObjectName|contains: 'ScreenConnect\App_Extensions\\*\\'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: critical