CVE-2024-1708 - ScreenConnect Path Traversal Exploitation

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.

Query · sigma

selection:
  Image|endswith: \ScreenConnect.Service.exe
  TargetFilename|endswith:
  - ScreenConnect\\App_Extensions\\*.ashx
  - ScreenConnect\\App_Extensions\\*.aspx
filter_main_legit_extension:
  TargetFilename|contains: ScreenConnect\App_Extensions\\*\\
condition: selection and not 1 of filter_main_*

Known false positives

  • This will occur legitimately as well and will result in some benign activity.
Raw source CVE-2024-1708 - ScreenConnect Path Traversal Exploitation · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: CVE-2024-1708 - ScreenConnect Path Traversal Exploitation
id: 44d7af7e-88e6-4490-be11-55f7ff4d9fc1
related:
    - id: 4c198a60-7d05-4daf-8bf7-4136fb6f5c62
      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.
references:
    - https://www.connectwise.com/company/trust/security-bulletins/connectwise-screenconnect-23.9.8
    - https://www.cve.org/CVERecord?id=CVE-2024-1709
    - https://www.huntress.com/blog/a-catastrophe-for-control-understanding-the-screenconnect-authentication-bypass
author: Matt Anderson, Andrew Schwartz, Caleb Stewart, Huntress
date: 2024-02-21
tags:
    - attack.persistence
    - cve.2024-1708
    - detection.emerging-threats
logsource:
    product: windows
    category: file_event
detection:
    selection:
        Image|endswith: '\ScreenConnect.Service.exe'
        TargetFilename|endswith:
            - 'ScreenConnect\\App_Extensions\\*.ashx'
            - 'ScreenConnect\\App_Extensions\\*.aspx'
    filter_main_legit_extension:
        TargetFilename|contains: 'ScreenConnect\App_Extensions\\*\\'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - This will occur legitimately as well and will result in some benign activity.
level: medium

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