Attack Chain

1. An attacker gains administrative access to the SimpleHelp console, either through compromised credentials or exploiting a separate authentication bypass.
2. The attacker crafts a malicious ZIP archive containing a file with a path traversal sequence (e.g., “../../ malicious.exe”) in its filename.
3. The attacker uploads the crafted ZIP archive to the SimpleHelp server through a file upload functionality available to administrators.
4. The SimpleHelp server extracts the contents of the ZIP archive without proper validation of the file paths.
5. The file with the path traversal sequence is extracted to an arbitrary location on the file system outside of the intended upload directory.
6. The attacker leverages a method to execute the uploaded malicious executable. This could involve overwriting an existing system utility or service executable.
7. The malicious executable runs with the privileges of the SimpleHelp server user.
8. The attacker achieves arbitrary code execution on the host, potentially leading to complete system compromise, data exfiltration, or deployment of ransomware.

Impact

Successful exploitation of CVE-2024-57728 allows an attacker to execute arbitrary code on the SimpleHelp server with the privileges of the SimpleHelp service account. This can result in a full compromise of the SimpleHelp server, potentially leading to data theft, service disruption, or further lateral movement within the network. The vulnerability affects SimpleHelp installations, and the impact is high due to the potential for complete system takeover.

Recommendation

• Apply the mitigations provided by SimpleHelp to patch the vulnerability. Refer to the vendor advisory for instructions: https://simple-help.com/kb---security-vulnerabilities-01-2025#security-vulnerabilities-in-simplehelp-5-5-7-and-earlier
• Monitor SimpleHelp server file uploads for ZIP archives containing path traversal sequences (e.g., “../”) in filenames using a file integrity monitoring system (FIM) or endpoint detection and response (EDR) solution. Deploy the “Detect SimpleHelp Path Traversal ZIP Upload” Sigma rule to identify suspicious ZIP files.
• Implement strict access controls and regularly audit administrative access to the SimpleHelp console to prevent unauthorized users from exploiting the vulnerability.