Patch

CVE-2023-25690

with vRx

Vulnerability Overview

CVE Name

CVE-2023-25690

Severity

9.8

Critical

CVE Description

Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack. Configurations are affected when mod_proxy is enabled along with some form of RewriteRule or ProxyPassMatch in which a non-specific pattern...

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Latest Patch info

There is no patch available at the moment, but you can use our script.

Patch Name

Date

Script

Script Type

Remediation script

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🔒 Upgrade and Secure Your Apache Server Against CVE-2023-25690 To combat the critical CVE-2023-25690 vulnerability, I have developed a script that not only updates your Apache server but also remediates potential configuration issues to ensure robust security. 🔍 How it works: This script performs two vital tasks: Upgrade Apache: Automatically updates your Apache server to the latest version available using apt, ensuring it is at least version 2.4.56. Remediate Configurations: Checks your Apache configuration files for vulnerable patterns (RewriteRule and ProxyPassMatch) and replaces them with safer, specific patterns to prevent HTTP Request Smuggling attacks. ⚠️ Why it matters: CVE-2023-25690 is a critical vulnerability that affects Apache versions before 2.4.56, allowing attackers to perform HTTP Request Smuggling attacks. This can lead to unauthorized access and severe security breaches. Implementing this script helps ensure your Apache server is updated and its configurations are secure, protecting your system from potential exploits.

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#!/bin/bash

update_apache() {
    echo "Updating Apache to the latest version using apt..."
    sudo apt-get update
    sudo apt-get install -y apache2

# Check the installed Apache version
    apache_version=$(apache2 -v | grep "Server version" | awk '{print $3}' | cut -d'/' -f2)
    echo "Apache version installed: $apache_version"

# Ensure the version is 2.4.56 or later
    required_version="2.4.56"
    if [ "$(printf '%s\n' "$required_version" "$apache_version" | sort -V | head -n1)" = "$required_version" ]; then 
        echo "Apache has been updated to version $required_version or later."
    else
        echo "Failed to update Apache to version $required_version or later. Please check for errors."
    fi

sudo systemctl restart apache2

# Confirm Apache is running
    if systemctl status apache2 | grep -q "active (running)"; then
        echo "Apache is running."
    else
        echo "Apache failed to start. Please check the system logs."
    fi
}

# Function to search for and fix vulnerable configurations
check_and_fix_vulnerable_configurations() {
    config_files=("/etc/apache2/apache2.conf" "/etc/apache2/sites-available/*.conf" "/etc/apache2/sites-enabled/*.conf")

for config_file in "${config_files[@]}"; do
        if [ -f "$config_file" ]; then
            echo "Checking $config_file for vulnerable configurations..."
            
            # Backup the configuration file
            sudo cp "$config_file" "$config_file.bak"
            
            # Search and replace vulnerable configurations
            if sudo grep -E "RewriteRule|ProxyPassMatch" "$config_file"; then
                echo "Potentially vulnerable configurations found in $config_file."
                
                # Replace vulnerable configurations
                sudo sed -i -E 's/RewriteRule[^\[]*\[P\]/RewriteRule <specific-pattern> [P]/g' "$config_file"
                sudo sed -i -E 's/ProxyPassMatch[^\[]*\[P\]/ProxyPassMatch <specific-pattern> [P]/g' "$config_file"
                
                echo "Vulnerable configurations have been updated in $config_file."
            else
                echo "No vulnerable configurations found in $config_file."
            fi
        else
            echo "Configuration file $config_file not found."
        fi
    done

sudo systemctl restart apache2
}

main() {
    update_flag=true

echo "Running remediation for potential CVE-2023-25690 vulnerabilities..."

if [ "$update_flag" = true ]; then
        update_apache
    else
        check_and_fix_vulnerable_configurations
    fi
    
}

main

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Affected OS & Apps

HTTP Server

Apache

4.8

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