SimpleHelp RMM vulnerabilities enable unauthenticated remote code execution
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Three chained flaws in SimpleHelp RMM versions 5.3–5.5 allow unauthenticated attackers to download secrets and execute arbitrary code; active exploitation reported in healthcare.
Three vulnerabilities in SimpleHelp RMM—a widely deployed remote access platform—can be chained to achieve remote code execution on affected systems. CVE-2024-57727 is an unauthenticated path traversal that allows attackers to download arbitrary files, including encrypted configuration and credentials with a hardcoded decryption key. CVE-2024-57728 is an arbitrary file upload flaw exploitable by authenticated users; once credentials are obtained via CVE-2024-57727, an attacker can upload malicious files to the SimpleHelp server or connected remote machines, achieving code execution through overwritten executables (Windows) or crontab injection (Linux). CVE-2024-57726 permits privilege escalation by bypassing authorization checks on admin functions, allowing unauthenticated or low-privilege attackers to assume administrative rights and then exploit the upload flaw.
The vulnerabilities affect SimpleHelp versions 5.3, 5.4, and 5.5. Help Net Security has reported active exploitation against healthcare organizations. An attacker exploiting all three in sequence gains remote code execution in system context, enabling data theft, modification, deletion, and lateral movement depending on the privileges under which SimpleHelp runs.
Defenders should immediately patch affected systems, enforce least-privilege execution of SimpleHelp services, segment network access to the RMM platform, and conduct vulnerability scans to identify exposed instances. Monitoring should focus on path traversal attempts against configuration endpoints and unusual file uploads to the SimpleHelp server.
Mentioned in this report
Detection guidance
SimpleHelp Path Traversal Against Toolbox Resource Endpoint
Web request to the SimpleHelp toolbox-resource endpoint containing directory traversal sequences, consistent with CVE-2024-57727 file disclosure of server configuration and credentials. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.
title: SimpleHelp Path Traversal Against Toolbox Resource Endpoint
description: Detects web requests to the SimpleHelp toolbox-resource endpoint that
contain directory traversal sequences (plain or URL-encoded). This matches the CVE-2024-57727
unauthenticated path traversal used to read encrypted server configuration and credential
files. Generalises on the endpoint plus traversal pattern, not a specific target
file.
tags:
- attack.initial-access
- attack.t1190
- attack.credential-access
- attack.t1552.001
logsource:
category: webserver
detection:
selection_endpoint:
cs-uri-stem|contains: toolbox-resource
selection_traversal:
cs-uri-stem|contains:
- ../
- ..\
- '%2e%2e'
- ..%2f
- ..%5c
condition: selection_endpoint and selection_traversal
falsepositives:
- Authorised vulnerability scanners probing SimpleHelp servers
- Penetration tests against the RMM platform
level: high
id: 1f0e0c19-0396-513d-a736-169d86a2b90d
status: experimental
author: Vorant
references:
- https://www.cisecurity.org/advisory/multiple-vulnerabilities-in-simplehelp-rmm-could-allow-for-arbitrary-code-execution_2025-012
Shell or Scripting Process Spawned by SimpleHelp Service
SimpleHelp server or remote-access service processes spawning command interpreters or LOLBins, which may indicate code execution after exploitation of the file upload or privilege escalation flaws. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.
title: Shell or Scripting Process Spawned by SimpleHelp Service
description: Detects SimpleHelp server or JWrapper remote-access components spawning
cmd, PowerShell, script hosts or download LOLBins. After chaining CVE-2024-57727,
CVE-2024-57726 and CVE-2024-57728, attackers get code execution in SYSTEM context
through uploaded or overwritten executables. Legitimate remote-shell use by technicians
will also match, so review against known sessions.
tags:
- attack.initial-access
- attack.t1190
- attack.execution
logsource:
category: process_creation
product: windows
detection:
selection_parent:
ParentImage|contains:
- \JWrapper-Remote Access\
- \SimpleHelp\
selection_child:
Image|endswith:
- \cmd.exe
- \powershell.exe
- \pwsh.exe
- \wscript.exe
- \cscript.exe
- \mshta.exe
- \certutil.exe
- \bitsadmin.exe
condition: selection_parent and selection_child
falsepositives:
- Helpdesk technicians using the SimpleHelp remote terminal or script deployment features
- Legitimate SimpleHelp-driven software installation or maintenance scripts
level: medium
id: 900e998c-0034-59c3-94ec-b1f84f62f999
status: experimental
author: Vorant
references:
- https://www.cisecurity.org/advisory/multiple-vulnerabilities-in-simplehelp-rmm-could-allow-for-arbitrary-code-execution_2025-012
SimpleHelp Winpty Named Pipes Created
Creation of winpty-conin, winpty-conout and winpty-control named pipes used by the SimpleHelp remote terminal, which can reveal interactive shell access through a compromised RMM. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.
title: SimpleHelp Winpty Named Pipes Created
description: Detects creation of winpty console named pipes associated with the SimpleHelp
remote terminal. An unexpected remote shell session on a host following exploitation
of a SimpleHelp server is a useful hunting signal. Winpty is also used by other
terminal software, so correlate with SimpleHelp processes.
tags:
- attack.initial-access
- attack.t1190
logsource:
category: pipe_created
product: windows
detection:
selection:
PipeName:
- \winpty-conin-*
- \winpty-conout-*
- \winpty-control-*
condition: selection
falsepositives:
- Git for Windows or MSYS2 terminals that use winpty
- Legitimate SimpleHelp technician terminal sessions
level: low
id: 1ec5fc91-631a-5bb9-829e-3dad827a96d9
status: experimental
author: Vorant
references:
- https://www.cisecurity.org/advisory/multiple-vulnerabilities-in-simplehelp-rmm-could-allow-for-arbitrary-code-execution_2025-012
Behavioural rules are generated from public reporting — validate in your environment before deploying.
Source reporting: https://www.cisecurity.org/advisory/multiple-vulnerabilities-in-simplehelp-rmm-could-allow-for-arbitrary-code-execution_2025-012
What this brief leaves out
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