External risk intelligence

SimpleHelp Remote Support: Arbitrary File Upload Vulnerability

CVE advisoryKnown Exploit

CVE-2024-57728

A vulnerability in SimpleHelp remote support software allows administrative users to upload arbitrary files, potentially leading to unauthorized code execution. This could compromise affected systems, impacting business operations and data. Organizations should identify vulnerable assets, reduce exposure, and apply ven

4Halo Surface Signal

Path Traversal

Simple Help Simplehelp

before 5.5.8

External exposure likelihood

Halo Surface Signal score for CVE-2024-57728

SimpleHelp is remote support software designed to be deployed as an internet-facing server to facilitate connections between technicians and remote devices. Because it functions as a gateway or edge service to allow external access for remote support operations, it is commonly deployed with internet connectivity.

Horizon Alert

Summary of the vulnerability and why it matters

SimpleHelp remote support software has a vulnerability that allows administrative users to upload any file to the system. This could enable attackers to run unauthorized code on the server. The vulnerability exists in versions prior to 5.5.8.

Vulnerable: SimpleHelp remote support software
Flaw: Allows arbitrary file uploads
Impact: Unauthorized code execution

Attack Path

How an attacker could exploit the issue

Attackers can exploit a vulnerability in SimpleHelp remote support software to gain control of a host system. This attack requires administrative access to the SimpleHelp server. By uploading a specially crafted zip file, an attacker can place arbitrary files on the system, leading to the execution of their own code. This results in the attacker controlling the host in the context of the SimpleHelp server user, posing a significant business risk.

Exposure requires an admin user.
Attacker uploads a crafted zip file.
Arbitrary file upload leads to code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in SimpleHelp remote support software could allow an attacker to execute arbitrary code on the host system. Attackers with administrative privileges can leverage a crafted zip file to overwrite or place files anywhere on the system. This could lead to a compromise of the affected server, impacting business operations and data integrity. Given the potential for remote code execution, this situation warrants prompt attention.

Attacker skill level: Expert
Required access: Admin privileges
Business risk: High, urgent action needed

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in SimpleHelp remote support software can allow administrative users to upload arbitrary files to the file system. Exploitation could lead to the execution of arbitrary code on the host system within the context of the SimpleHelp server user, posing a significant risk to the organization.

Find assets running the affected software.
Reduce exposure or isolate affected systems.
Apply vendor fixes and validate.
Monitor for related activity.

Frequently asked questions

What is SimpleHelp remote support software and its function?

SimpleHelp is a remote support software solution that enables technicians to establish connections with and manage devices from a distance. It typically operates as a server to facilitate these remote access capabilities.

What is the weakness class for CVE-2024-57728 in SimpleHelp?

CVE-2024-57728 is identified with weakness classes CWE-22 (Improper Limitation of a Pathname to a Restricted Directory or a Location Outside of the Expected Directory) and CWE-59 (Improper Limitation of a Pathname to a Restricted Directory or a Location Outside of the Expected Directory), commonly known as path traversal or zip slip.

How can an attacker trigger a code execution vulnerability in SimpleHelp?

An attacker with administrative privileges can exploit this vulnerability by uploading a specially crafted zip file. This crafted file allows arbitrary file uploads to any location on the file system, which can then be used to execute arbitrary code in the context of the SimpleHelp server user.

What is the relevance of SimpleHelp's vulnerability to threat actors?

This SimpleHelp vulnerability is classified as external due to its network attack vector, making it accessible over the internet. It has been noted as being used in ransomware operations, highlighting its significant threat to organizations.

What steps should be taken to address the SimpleHelp vulnerability?

Organizations should identify all assets running the affected SimpleHelp software, reduce their exposure or isolate them if possible, and promptly apply vendor-released fixes. Continuous monitoring for any suspicious activity related to this vulnerability is also recommended.

References

Written by Nicholas Merritt

External-surface CVE analysis and Halo Surface Signal prioritization for Halo Threat Intelligence.