5000+ CrushFTP Servers Hacked Using Zero-Day Exploit

Hackers often target CrushFTP servers as they contain sensitive data and are used for file sharing and storage.

This makes them attractive targets for data theft and ransomware attacks for the threat actors. 

Besides this, the vulnerabilities in CrushFTP servers can be exploited to gain unauthorized access to networks or distribute malware to connected systems.

Silent Push researchers recently identified that on April 19th, CrushFTP disclosed a critical zero-day vulnerability tracked as CVE-2024-4040 with a CVSS score of 9.8 in versions before 10.7.1/11.1.0. 

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Technical Analysis

The unauthenticated exploit allows escaping the Virtual File System via the WebInterface, gaining admin access and remote code execution capabilities.

CrushFTP urged immediate upgrades, even for DMZ deployments. 

Researchers monitored the vulnerability, populating data feeds with vulnerable domains, IPs hosting the service, and infrastructure actively exploiting CVE-2024-4040 for early detection.

Silent Push conducts daily internet-wide scans that help categorize the data using SPQL to locate the associated infrastructure and content. 

Leveraging the CVE-2024-4040 information, queries identified exploitable internet-exposed CrushFTP web interfaces. 

The resulting vulnerable domains and IPs were clustered into two Bulk Data Feeds for enterprise customers to analyze the affected infrastructure.

Here below, we have mentioned those two Bulk Data Feeds:-

  • CrushFTP Vulnerable Domains
  • CrushFTP Vulnerable IPs
Silent Push CrushFTP Bulk Data Feeds (Source - Silent Push)
Silent Push CrushFTP Bulk Data Feeds (Source – Silent Push)

SPQL, at its core, is a tool of analysis for DNS data that spans over 90 categories. The map shows where CrushFTP interfaces are vulnerable to CVE-2024-4040 on a global scale.


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While most are in the US and Canada, many can be found across Europe as well as throughout:-

  • South America
  • Russia
  • Asia
  • Australia
Global distribution of CrushFTP web interfaces (Source - Silent Push)
Global distribution of CrushFTP web interfaces (Source – Silent Push)

This helps potential targets understand how big this issue really is, and it gives security professionals an idea of what they are up against.

Enterprise users can download raw data, as well as export bulk data feeds in the form of API endpoints that list CrushFTP domains and IPs that are susceptible to attacks. 

With this information, security teams can identify weaknesses within their networks and inform risk-scoring systems used to evaluate outside dangers.

Meanwhile, a feed for early detection can track intrusion attempts in real time while simultaneously logging infrastructure related to those attempts so that it can be automatically blocked.

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Author: Tushar Subhra Dutta