Patch

CVE-2015-4000

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Vulnerability Overview

CVE Name

CVE-2015-4000

Severity

3.7

Low

CVE Description

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello...

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Latest Patch info

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

Patch Name

https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Date

15.12.2022

Script

Script Type

Remediation script

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🔒 Remediating CVE-2015-4000 (Logjam) Vulnerability Ensure your servers are secure from the Logjam attack with our remediation script. This script helps you mitigate the CVE-2015-4000 vulnerability by updating your configuration files to disable weak export-grade ciphers. 🔍 How it works: This remediation script scans and updates the configuration files of various services (Apache, Nginx, Postfix, Dovecot, OpenVPN, SSH, Sendmail, Tomcat, HAProxy, and Lighttpd). It replaces the export-grade ciphers with secure alternatives and restarts the affected services to apply the changes. ⚠️ Why it matters: CVE-2015-4000, also known as the Logjam vulnerability, allows attackers to force a downgrade of TLS connections to a weak 512-bit export-grade cryptography. This makes your data vulnerable to interception and decryption. By implementing this remediation script, you can eliminate weak ciphers from your server configurations, protecting your sensitive information and maintaining robust security for your systems.

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#!/bin/bash

declare -A services_config=(
  [apache]="/tmp/mock_configs/ssl.conf"
  [nginx]="/tmp/mock_configs/nginx.conf"
  [postfix]="/tmp/mock_configs/main.cf"
  [dovecot]="/tmp/mock_configs/dovecot.conf"
  [openvpn]="/tmp/mock_configs/server.conf"
  [ssh]="/tmp/mock_configs/sshd_config"
  [sendmail]="/tmp/mock_configs/sendmail.mc"
  [tomcat]="/tmp/mock_configs/server.xml"
  [haproxy]="/tmp/mock_configs/haproxy.cfg"
  [lighttpd]="/tmp/mock_configs/lighttpd.conf"
)

# Define a function to update the Apache configuration
update_apache() {
  sed -i 's/\bEXPORT\b/!EXPORT/g' "$1"
  echo "Updated Apache configuration."
}

# Define a function to update the Nginx configuration
update_nginx() {
  sed -i 's/\bEXPORT\b/!EXPORT/g' "$1"
  echo "Updated Nginx configuration."
}

# Define a function to update the Sendmail configuration
update_sendmail() {
  sed -i 's/\bEXPORT\b/!EXPORT/g' "$1"
  echo "Updated Sendmail configuration."
}

# Define a function to update the Tomcat configuration
update_tomcat() {
  sed -i 's/\bEXPORT\b/!EXPORT/g' "$1"
  echo "Updated Tomcat configuration."
}

# Define a function to update the HAProxy configuration
update_haproxy() {
  sed -i 's/\bEXPORT\b/!EXPORT/g' "$1"
  echo "Updated HAProxy configuration."
}

# Define a function to update the Lighttpd configuration
update_lighttpd() {
  sed -i 's/\bEXPORT\b/!EXPORT/g' "$1"
  echo "Updated Lighttpd configuration."
}

update_service_config() {
  service=$1
  config_file=$2

case $service in
    apache)
      update_apache "$config_file"
      ;;
    nginx)
      update_nginx "$config_file"
      ;;
    sendmail)
      update_sendmail "$config_file"
      ;;
    tomcat)
      update_tomcat "$config_file"
      ;;
    haproxy)
      update_haproxy "$config_file"
      ;;
    lighttpd)
      update_lighttpd "$config_file"
      ;;
    *)
      echo "No specific update function defined for $service."
      ;;
  esac
}

for service in "${!services_config[@]}"; do
  config_file=${services_config[$service]}
  
  if [[ -f $config_file ]]; then
    echo "Updating $service configuration file: $config_file"
    update_service_config "$service" "$config_file"
  else
    echo "Configuration file $config_file for $service not found."
  fi
done

echo "Mitigation script completed."

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Affected OS & Apps

Firefox

Mozilla

Thunderbird

Mozilla

Safari

Apple

4.8

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