Rejetto HTTP File Server (HFS) 2.3m Remote Code Execution (RCE) Vulnerability (CVE-2024-23692) Analysis and Mitigation Guide
Executive & SecOps Summary
SECOPS ASSESSMENTRejetto HTTP File Server (HFS) up to and including version 2.3m
Unauthenticated remote attackers can execute arbitrary commands on the host system by sending a specially crafted HTTP request
Immediately discontinue the use of HFS 2.x, migrate to the completely redesigned HFS 3, or restrict network access
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Since Rejetto HFS 2.x is no longer supported, no official security patches will be released for this version. The recommended course of action is to decommission HFS 2.x and migrate to the modern, Node.js-based HFS 3. Below is an example of deploying a secure HFS 3 container using Docker:
# Terminate the legacy HFS 2.x process (Windows example)
taskkill /F /IM hfs.exe
# Deploy the latest secure HFS 3 container
docker run -d \
--name hfs-secure \
-p 8080:80 \
-v /path/to/your/files:/usr/share/hfs/public \
rejetto/hfs:latest2. Temporary Workaround & Hardening Configuration
If immediate migration is not feasible, you must restrict network access to the HFS port (default 80/8080) using firewalls. Below is a PowerShell script to block all external traffic to HFS while allowing only trusted internal subnets:
# Disable existing permissive firewall rules for HFS
Disable-NetFirewallRule -DisplayName 'HTTP File Server'
# Create a rule to block all external access to HFS ports
New-NetSecurityRule -DisplayName 'Block_HFS_External' \
-Direction Inbound \
-Action Block \
-LocalPort 80,8080 \
-Protocol TCP
# Create a rule to allow only trusted internal subnets (e.g., 10.0.0.0/8)
New-NetSecurityRule -DisplayName 'Allow_HFS_Internal_Only' \
-Direction Inbound \
-Action Allow \
-RemoteAddress '10.0.0.0/8' \
-LocalPort 80,8080 \
-Protocol TCP3. Log Audit & IoC Verification Commands
To detect potential exploitation attempts, inspect the HFS access logs for suspicious macro execution patterns or command execution keywords (such as exec, cmd.exe, or powershell combined with template delimiters):
# Search HFS log files for suspicious template injection patterns
$LogPath = 'C:\Program Files\HFS\logs\*.log'
Get-ChildItem -Path $LogPath | Select-String -Pattern '(?i)(exec|sys|cmd\.exe|powershell|%5B%25|%25)'Block Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2024-23692) is a critical Template Injection (CWE-1336) and Code Injection (CWE-94) vulnerability in Rejetto HTTP File Server (HFS) version 2.3m and prior. The root cause lies in the way the HFS 2.x built-in template engine processes user-supplied input. Due to insufficient input validation and sanitization, the template parser interprets specific macro symbols within HTTP requests as executable code rather than literal strings.
2. Exploitation Mechanics & Attack Scenario
An unauthenticated remote attacker can exploit this vulnerability by sending a crafted HTTP GET or POST request containing malicious HFS macro syntax (e.g., utilizing %url% or other macro execution patterns). When the HFS server processes this request, the template parser executes the embedded macro commands, spawning a shell process (cmd.exe or PowerShell) with the privileges of the HFS service. Because no authentication is required, this vulnerability is highly reliable and trivial to exploit.
3. Infrastructure & Business Impact
With a CVSS score of 9.8 (Critical) and active exploitation observed in the wild (CISA KEV), this vulnerability poses an extreme risk to enterprise networks. Successful exploitation grants the attacker full system-level or administrative control over the hosting server. This can lead to complete infrastructure compromise, deployment of ransomware, lateral movement within the internal network, and sensitive data exfiltration.
Official Vendor Advisories & References
Rejetto HTTP File Server, up to and including version 2.3m, is vulnerable to a template injection vulnerability. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary commands on the affected system by sending a specially crafted HTTP request. As of the CVE assignment date, Rejetto HFS 2.3m is no longer supported.
Frequently Asked SecOps Questions (CVE-2024-23692)
FAQQ1. How critical is CVE-2024-23692 and is it actively exploited in the wild?
CVE-2024-23692 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 99.5%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2024-23692?
Primary impacted vendors include rejetto across hfs, http_file_server. Scope summary: Rejetto HTTP File Server (HFS) version 2.3m and all prior 2.x versions (Note: HFS 2.x is officially End-of-Life and no longer supported)
Q3. What temporary mitigations or workarounds exist for CVE-2024-23692 before patching?
[Mitigation] Immediately discontinue the use of HFS 2.x, migrate to the completely redesigned HFS 3, or restrict network access Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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