Patch

CVE-2024-6409

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Vulnerability Overview

CVE Name

CVE-2024-6409

Severity

High

CVE Description

A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls...

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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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🔒 Mitigate CVE-2024-6409 Vulnerability in OpenSSH Secure your system with this mitigation script for CVE-2024-6409. 🔍 How it works: This script modifies the OpenSSH configuration to mitigate the vulnerability by setting LoginGraceTime to 0. It checks and applies this setting in both /etc/ssh/sshd_config and /usr/local/etc/sshd_config, ensuring coverage for different system setups. ⚠️ Why it matters: CVE-2024-6409 reintroduces a critical vulnerability in certain OpenSSH versions, potentially allowing unauthorized access. Implementing this mitigation script ensures that your SSH service is configured to minimize risk, protecting your system from exploitation. Stay Safe. Note: This makes sshd vulnerable to a denial of service (the exhaustion of all MaxStartups connections), but it makes it safe from this vulnerability. Sources: https://ubuntu.com/security/CVE-2024-6387

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#!/bin/bash

config_files=("/etc/ssh/sshd_config" "/usr/local/etc/sshd_config")

apply_mitigation() {
    local config_file=$1

if [ -f "$config_file" ]; then
        cp $config_file $config_file.bak || { echo "Failed to backup $config_file"; return 1; }

if grep -q "^LoginGraceTime" $config_file; then
            sed -i 's/^LoginGraceTime.*/LoginGraceTime 0/' $config_file || { echo "Failed to update LoginGraceTime in $config_file"; return 1; }
        else
            echo "LoginGraceTime 0" >> $config_file || { echo "Failed to add LoginGraceTime to $config_file"; return 1; }
        fi

echo "Mitigation applied. LoginGraceTime set to 0 in $config_file."
    else
        echo "Configuration file $config_file not found."
        return 1
    fi
}

restart_ssh_service() {
    if command -v systemctl > /dev/null; then
        sudo systemctl is-active --quiet ssh && sudo systemctl restart ssh && return 0
        sudo systemctl is-active --quiet sshd && sudo systemctl restart sshd && return 0
    fi

if command -v service > /dev/null; then
        sudo service ssh status > /dev/null 2>&1 && sudo service ssh restart && return 0
        sudo service sshd status > /dev/null 2>&1 && sudo service sshd restart && return 0
    fi

return 1
}

success=false
for config_file in "${config_files[@]}"; do
    if apply_mitigation "$config_file"; then
        success=true
    fi
done

if $success; then
    if ! restart_ssh_service; then
        echo "SSH service restart failed. Manual restart required."
    fi
else
    echo "No configuration files were modified. SSH service restart not required."
fi

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Affected OS & Apps

No items found.

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