CVE-2024-57727

What is SimpleHelp?

SimpleHelp is a remote access and support platform used by IT departments, managed service providers (MSPs), and helpdesk teams to remotely access and manage endpoints. Like other remote support tools, SimpleHelp servers are high-value targets: an attacker who compromises a SimpleHelp server gains credentials that can be leveraged to access every managed endpoint in the organization, and MSP-operated servers represent an entry point into multiple downstream client networks. SimpleHelp is deployed as a self-hosted server, making unpatched instances the responsibility of the deploying organization.

Overview

CVE-2024-57727 is an unauthenticated path traversal vulnerability in SimpleHelp remote support software that allows a remote attacker to download arbitrary files from the SimpleHelp host via crafted HTTP requests — without any authentication. Exploitable files include the server configuration file and hashed user passwords, which can be cracked offline to gain access to the SimpleHelp admin console. CISA confirmed ransomware use in the wild by February 2025. The vulnerability was one of three patched in a January 2025 SimpleHelp update; the others included a server-side code execution flaw that can be chained with this credential-theft vulnerability.

Affected Versions

Technical Details

CWE-22 (Improper Limitation of a Pathname to a Restricted Directory / Path Traversal). The SimpleHelp web server exposes file download functionality without adequately restricting paths to an allowed directory. An unauthenticated attacker can craft an HTTP request with path traversal sequences to reach files outside the intended scope, including:

• serverconfig.xml or equivalent — contains SimpleHelp configuration, user account information, and potentially cleartext or hashed credentials
• Hashed administrator passwords — susceptible to offline dictionary/brute-force attacks, particularly if weak passwords were chosen

Once an attacker obtains the admin password hash and cracks it (or finds another credential in the config), they can log into the SimpleHelp admin console and use the platform's built-in remote access capabilities to connect to managed endpoints, deploy tools, execute commands, or install ransomware. CISA confirmed this exploitation chain was used in ransomware deployments.

Discovery

Reported to SimpleHelp, which released patches on January 13, 2025 — two days before the CVE was formally published. The January 2025 release addressed path traversal (CVE-2024-57727), an authentication bypass (CVE-2024-57728), and a server-side code execution issue (CVE-2024-57726).

Exploitation Context

CISA's February 13, 2025 KEV addition, combined with the explicit ransomwareUse: true designation, confirms that threat actors successfully exploited CVE-2024-57727 to steal credentials from SimpleHelp servers, then leveraged those credentials to deploy ransomware across managed endpoints. The MSP attack vector — where a single compromised SimpleHelp server touches multiple client networks — amplifies the blast radius significantly. CISA published a joint advisory (AA25-163A) with additional technical details on the exploitation chain.

Remediation

1. Upgrade SimpleHelp to version 5.5.8, 5.4.10, or 5.3.9 (whichever branch is in use) or any later release.
2. After patching, immediately rotate all SimpleHelp administrator passwords and any service account credentials accessible through the SimpleHelp configuration.
3. Review SimpleHelp server access logs for unexpected file download requests that may indicate exploitation prior to patching.
4. Restrict access to the SimpleHelp management interface to trusted IPs — it should not be publicly accessible without IP allowlisting or VPN.
5. Enable MFA on all SimpleHelp accounts where supported.
6. If MSP-operated: notify downstream clients of potential exposure and initiate endpoint audits for persistence mechanisms (new user accounts, scheduled tasks, deployed tools) that may have been installed via the compromised SimpleHelp access.