CVE-2018-25169: AMPPS 2.7 Denial of Service Vulnerability

CVE-2018-25169 Overview

CVE-2018-25169 is a denial of service vulnerability affecting AMPPS 2.7, a popular web development stack that bundles Apache, MySQL, MongoDB, PHP, Perl, and Python. The vulnerability allows remote attackers to crash the service by sending malformed data to the default HTTP port. Attackers can establish multiple socket connections and transmit invalid payloads to exhaust server resources and cause service unavailability.

Critical Impact
Remote attackers can cause complete service unavailability by exploiting improper input handling in the AMPPS HTTP service, leading to resource exhaustion and service crashes without requiring authentication.

Affected Products

AMPPS 2.7
AMPPS web development stack with vulnerable HTTP service component
Systems running AMPPS on default HTTP port configurations

Discovery Timeline

2026-03-06 - CVE CVE-2018-25169 published to NVD
2026-03-09 - Last updated in NVD database

Technical Details for CVE-2018-25169

Vulnerability Analysis

This denial of service vulnerability stems from improper handling of malformed socket data in AMPPS 2.7. When the HTTP service receives specially crafted invalid payloads through established socket connections, it fails to properly validate and reject the malformed input, leading to resource exhaustion.

The vulnerability is classified under CWE-1188 (Initialization with Hard-Coded Network Resource Configuration Identifier), indicating that the application's default network configuration contributes to the attack surface. The network-based attack vector allows remote exploitation without any authentication requirements or user interaction, making this vulnerability particularly dangerous for internet-facing AMPPS installations.

Root Cause

The root cause of this vulnerability lies in the inadequate input validation mechanism within the AMPPS HTTP service. When processing incoming socket connections, the service does not properly sanitize or validate the data payload structure before attempting to process it. This allows attackers to send malformed data that consumes server resources without proper bounds checking or connection throttling.

The use of insecure default configurations exacerbates the issue, as the service listens on standard HTTP ports without appropriate rate limiting or connection management controls.

Attack Vector

The attack leverages network-based exploitation through the HTTP port. An attacker initiates multiple socket connections to the AMPPS HTTP service and transmits invalid or malformed payloads through these connections. The service attempts to process these malformed requests, leading to resource exhaustion.

The attack does not require authentication, making it accessible to any network-reachable attacker. The exploitation process involves establishing persistent connections and flooding the service with malformed data packets, ultimately causing the service to become unresponsive or crash entirely.

Technical details and proof-of-concept information can be found in the Exploit-DB #45850 advisory and the VulnCheck Advisory on AMPPS DoS.

Detection Methods for CVE-2018-25169

Indicators of Compromise

Unusually high number of simultaneous socket connections to the AMPPS HTTP service
Repeated connection attempts from single IP addresses or IP ranges
Service crashes or restarts of the AMPPS HTTP daemon
System resource exhaustion indicators such as high memory or CPU usage associated with the AMPPS process
Network traffic containing malformed HTTP payloads or non-standard data structures

Detection Strategies

Monitor network traffic for abnormal connection patterns targeting the AMPPS HTTP port
Implement intrusion detection rules to identify malformed HTTP payloads and connection flooding
Deploy application-level logging to track connection establishment rates and payload validation failures
Use endpoint detection solutions to identify resource exhaustion patterns linked to the AMPPS process

Monitoring Recommendations

Enable detailed logging for AMPPS HTTP service connections and errors
Configure network monitoring tools to alert on connection rate anomalies
Implement real-time monitoring of system resources associated with AMPPS processes
Set up automated alerts for service availability and unexpected restarts

How to Mitigate CVE-2018-25169

Immediate Actions Required

Upgrade AMPPS to a patched version if available from the vendor
Restrict network access to the AMPPS HTTP service using firewall rules
Implement rate limiting on incoming connections to the HTTP port
Consider deploying a reverse proxy or web application firewall in front of AMPPS
Monitor for signs of active exploitation while implementing mitigations

Patch Information

Organizations should consult the VulnCheck Advisory on AMPPS DoS for current patch availability and upgrade guidance. Additionally, the Exploit-DB #45850 entry provides technical context that may assist in understanding the vulnerability scope.

Workarounds

Deploy network-level protections such as firewall rules to limit access to trusted IP ranges
Implement connection rate limiting at the network or application level to prevent resource exhaustion
Use a reverse proxy with built-in DoS protection capabilities in front of the AMPPS service
Consider running AMPPS in a containerized or isolated environment to limit the impact of service crashes
Enable TCP SYN flood protection and connection limiting at the operating system level

bash

# Example firewall configuration to limit connections
# Limit new connections per source IP (Linux iptables example)
iptables -A INPUT -p tcp --dport 80 -m connlimit --connlimit-above 20 -j DROP
iptables -A INPUT -p tcp --dport 80 -m limit --limit 25/minute --limit-burst 100 -j ACCEPT