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csi.pl
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#!/usr/local/cpanel/3rdparty/bin/perl
# CSI - cPanel Security Investigator
# Current Maintainer: Peter Elsner
use strict;
my $version = "3.5.23";
use Cpanel::Config::LoadWwwAcctConf();
use Cpanel::Config::LoadCpConf();
use Cpanel::Config::LoadUserDomains();
use Text::Tabs;
$tabstop = 4;
use File::Basename;
use File::Path;
use File::Find;
use File::stat;
use File::Slurp;
use IO::Prompt;
use LWP::UserAgent;
use DateTime;
use HTTP::Tiny;
use Cpanel::Exception ();
use Cpanel::FindBin ();
use Cpanel::Version ();
use Cpanel::Kernel::Status ();
use Cpanel::IONice ();
use Cpanel::PwCache ();
use Cpanel::PwCache::Get ();
use Cpanel::SafeRun::Timed ();
use JSON::PP;
use List::MoreUtils qw(uniq);
use Math::Round;
use POSIX;
use Getopt::Long;
use Path::Iterator::Rule;
use IO::Socket::INET;
use IO::Prompt;
use Term::ANSIColor qw(:constants);
use Time::Piece;
use Time::Seconds;
$Term::ANSIColor::AUTORESET = 1;
our $RUN_STATE;
our $gl_is_kernel=0;
###################################################
# Check to see if the calling user is root or not #
###################################################
if ( $> != 0 ) {
print "This script must be run as root\n";
exit;
}
_init_run_state();
if ( exists $ENV{'PACHA_AUTOFIXER'} ) {
_set_run_type('cptech');
}
elsif ( defined $ENV{'HISTFILE'}
and index( $ENV{'HISTFILE'}, 'cpanel_ticket' ) != -1 )
{
_set_run_type('cptech');
}
else {
foreach ( @ENV{ 'SSH_CLIENT', 'SSH_CONNECTION' } ) {
next unless defined $_;
next unless m{\A (184\.94\.197\.[2-6]|208\.74\.123\.98)}xms;
_set_run_type('cptech');
last;
}
}
my $rootdir = "/root";
my $csidir = "$rootdir/CSI";
our @HISTORY;
our $spincounter;
our $CPANEL_CONFIG_FILE = q{/var/cpanel/cpanel.config};
my $conf = Cpanel::Config::LoadWwwAcctConf::loadwwwacctconf();
my $cpconf = Cpanel::Config::LoadCpConf::loadcpconf();
my $allow_accesshash = $cpconf->{'allow_deprecated_accesshash'};
my $sha256only;
our $HOMEDIR = $conf->{'HOMEDIR'};
our @FILESTOSCAN = undef;
our $rootkitsfound = 0;
our @process_list = get_process_list();
my $hostname = Cpanel::SafeRun::Timed::timedsaferun( 10, 'hostname', '-f' );
chomp $hostname if defined $hostname;
if ( not length($hostname) ) {
$hostname = hostname();
}
###########################################################
# Parse positional parameters for flags and set variables #
###########################################################
# Set defaults for positional parameters
my (
$full, $shadow, $symlink, $yarascan,
$secadv, $help, $debug, $userscan,
$customdir, $binscan, $scan, %process,
%ipcs, $distro, $distro_version, $distro_major,
$distro_minor, $ignoreload, $overwrite, $cron
);
get_ipcs_hash( \%ipcs );
if ( -e '/usr/local/cpanel/Cpanel/Sys.pm' ) {
# up to 94
eval("use Cpanel::Sys");
eval("use Cpanel::Sys::OS");
$distro = Cpanel::Sys::OS::getos();
$distro_version = Cpanel::Sys::OS::getreleaseversion();
}
if ( -e '/usr/local/cpanel/Cpanel/OS.pm' ) {
if ( Cpanel::OS->can('instance') ) {
# 96 and 98
$distro = Cpanel::OS->instance->distro;
$distro_major = Cpanel::OS->instance->major;
$distro_minor = Cpanel::OS->instance->minor;
}
elsif ( Cpanel::OS->can('supported_methods') ) {
# 100+
$distro = Cpanel::OS->_instance->distro;
$distro_major = Cpanel::OS->_instance->major;
$distro_minor = Cpanel::OS->_instance->minor;
}
$distro_version = $distro_major . "." . $distro_minor;
}
our $OS_RELEASE = ucfirst($distro) . " Linux release " . $distro_version;
our $HTTPD_PATH = get_httpd_path();
our $LIBKEYUTILS_FILES_REF = build_libkeyutils_file_list();
our $IPCS_REF;
our $PROCESS_REF;
our $EA4 = isEA4();
our @RPM_LIST;
our $OPT_TIMEOUT;
GetOptions(
'bincheck' => \$binscan,
'userscan=s' => \$userscan,
'customdir=s' => \$customdir,
'full' => \$full,
'shadow' => \$shadow,
'symlink' => \$symlink,
'yarascan' => \$yarascan,
'secadv' => \$secadv,
'ignoreload' => \$ignoreload,
'help' => \$help,
'debug' => \$debug,
'overwrite' => \$overwrite,
'cron' => \$cron,
);
#######################################
# Set variables needed for later subs #
#######################################
our $CSISUMMARY;
our @SUMMARY;
our @RECOMMENDATIONS;
our @INFO;
my $content=get_hashes();
our @knownhashes = split /\n/, $content;
my $docdir = '/usr/share/doc';
check_for_touchfile();
my @logfiles = (
'/var/log/apache2/access_log', '/var/log/apache2/error_log', '/var/log/wtmp'
);
if ( $distro eq "ubuntu" ) {
push @logfiles, '/var/log/syslog';
push @logfiles, '/var/log/auth.log';
push @logfiles, '/var/log/mail.log';
}
else {
push @logfiles, '/var/log/messages';
push @logfiles, '/var/log/maillog';
push @logfiles, '/var/log/secure';
push @logfiles, '/var/log/cron';
}
######################
# Run code main body #
######################
if ($help) {
show_help();
exit;
}
if ( $cron ) {
$overwrite=1;
$full=1;
$yarascan=1;
logit("Running with cron switch (full, yarascan and overwrite are automatically added)");
}
check_previous_scans();
logit("=== STARTING CSI on $hostname ===");
sub get_loadavg {
my ($load_avg) = (
split(
/\s+/,
Cpanel::SafeRun::Timed::timedsaferun( 0, 'cat', '/proc/loadavg' )
)
)[0];
chomp($load_avg);
return $load_avg;
}
my $corecnt = Cpanel::SafeRun::Timed::timedsaferun( 0, 'nproc' );
chomp($corecnt);
my $loadavg = get_loadavg();
if ( $loadavg > ( $corecnt * 3 ) && !$ignoreload ) {
print RED
"Load Average is too high ($loadavg) which is greater than 3 times the number of cores\n";
print WHITE "If you really want to continue, pass --ignoreload\n";
logit( 'Load average too high: ' . $loadavg );
exit;
}
my %cpconf = get_conf($CPANEL_CONFIG_FILE);
if (
Cpanel::IONice::ionice(
'best-effort',
exists $cpconf{'ionice_import_exim_data'}
? $cpconf{'ionice_import_exim_data'}
: 6
)
)
{
print_info( "Setting I/O priority to reduce system load: "
. Cpanel::IONice::get_ionice()
. "\n" );
setpriority( 0, 0, 19 );
}
my $scanstarttime = Time::Piece->new;
print_header( YELLOW "Scan started on $scanstarttime" );
logit("Scan started on $scanstarttime");
logit("Showing disclaimer");
print_info("Usage: /root/csi.pl [functions] [options]");
print_info("See --help for a full list of options");
print_normal('');
disclaimer();
print_header(
"Checking for RPM database corruption and repairing as necessary...")
unless ( $distro eq "ubuntu" );
my $findRPMissues =
Cpanel::SafeRun::Timed::timedsaferun( 0,
'/usr/local/cpanel/scripts/find_and_fix_rpm_issues' )
unless ( $distro eq "ubuntu" );
my $isRPMYUMrunning = rpm_yum_running_chk() unless ( $distro eq "ubuntu" );
if ($binscan) {
bincheck();
if ( $distro eq "ubuntu" ) {
print "The bincheck option not available on Ubuntu!\n";
}
exit;
}
if ($userscan) {
my $usertoscan = $userscan;
chomp($usertoscan);
userscan($usertoscan);
exit;
}
logit("Running default scan");
scan();
my $scanendtime = Time::Piece->new;
print_header( YELLOW "\nScan completed on $scanendtime" );
logit("Scan completed on $scanendtime");
my $scantimediff = ( $scanendtime - $scanstarttime );
my $scanTotTime = $scantimediff->pretty;
$scanTotTime = $scanTotTime . "\n";
print_header("Elapsed Time: $scanTotTime");
logit("Elapsed Time: $scanTotTime");
logit("=== COMPLETED CSI ===");
if ( $cron ) {
send_email();
}
exit;
########
# Subs #
########
sub show_help {
print_header("\ncPanel Security Investigator Version $version");
print_header(
"Usage: /usr/local/cpanel/3rdparty/bin/perl csi.pl [options] [function]\n"
);
print_header("Functions");
print_header("=================");
print_status("With no arguments [DEFAULT] performs a quick scan looking for IoC's.");
print_normal(" ");
print_status( "--bincheck Performs RPM verification on core system binaries and prints active aliases.");
print_status( "--userscan cPanelUser Installs Yara if not already installed & performs a Yara scan for a single cPanel User.");
print_normal(" ");
print_header("Additional scan options available");
print_header("=================");
print_header( "--shadow Performs a check on all email accounts looking for variants of shadow.roottn hack.");
print_header( "--symlink Performs a symlink hack check for all accounts.");
print_header( "--secadv Runs Security Advisor");
print_header( "--yarascan Skips confirmation during --full scan. CAUTION - Can cause very high load and take a very long time!");
print_header( "--full Performs all of the above checks - very time consuming. Can cause HIGH LOAD DURING YARA SCANS!!!");
print_header( "--overwrite Overwrite last summary and skip creation of new CSI directory under root.");
print_header( "--cron Run via cron. Note: --full, --overwrite and --yarascan options will also be passed.");
print_header( "--debug Shows additional extrenuous info including errors if any. Use only at direction of cPanel Support.");
print_normal(" ");
print_header("Examples");
print_header("=================");
print_status(" /root/csi.pl [DEFAULT] quick scan");
print_status(" /root/csi.pl --symlink");
print_status(" /root/csi.pl --secadv");
print_status(" /root/csi.pl --full [--yarascan]");
print_status(" /root/csi.pl --overwrite");
print_status(" /root/csi.pl --cron [ add this to roots crontab or to a file in /etc/cron.d or /etc/cron.daily ]");
print_status("Bincheck: ");
print_status(" /root/csi.pl --bincheck");
print_status("Userscan ");
print_status(" /root/csi.pl --userscan myuser");
print_status(
" /root/csi.pl --userscan myuser --customdir mycustomdir");
print_status(
" (must be relative to the myuser homedir and defaults to public_html if non-existent!"
);
print_normal(" ");
}
sub bincheck {
return if ( $distro eq "ubuntu" );
logit("Starting bincheck");
print_normal('');
print_header('[ Starting cPanel Security Investigator Bincheck Mode ]');
print_header("[ System: $OS_RELEASE ]");
print_normal('');
print_header('[ Generating Installed RPM List - Please wait... ]');
logit("Generating Installed RPM List");
print_normal('');
my $rpmissues = 0;
my %okbins = (
'/usr/bin/at', '.M.......',
'/bin/su', '.M....G..',
'/bin/ping', '.M.......',
'/bin/ping6', '.M.......',
'/usr/bin/locate', '.M.......',
'/usr/bin/quota', '.M.......',
'/usr/bin/screen', '.M.......',
'/usr/sbin/userhelper', '.M.......',
'/usr/bin/chsh', '.M.......',
'/usr/bin/ld', '.M....G..',
'/usr/bin/c99', '.M....G..',
'/usr/bin/gcc', '.M....G..',
'/usr/bin/x86_64-redhat-linux-gcc', '.M....G..',
'/usr/bin/c++', '.M....G..',
'/usr/bin/g++', '......G..',
'/usr/bin/x86_64-redhat-linux-c++', '......G..',
'/usr/bin/x86_64-redhat-linux-g++', '......G..',
'/usr/bin/ssh-agent', '.M.......',
'/usr/bin/chage', '.M.......',
);
my @BINARIES;
my $verify_string;
my $verify;
my $binary;
my $binaryline;
return unless my $rpms = get_rpm_href();
my @rpms=split /\n/, $rpms;
my $RPMcnt = @rpms;
print_status( 'Done - Found: ' . $RPMcnt . ' Packages to verify' );
print_header('[ Verifying RPM binaries - This may take some time... ]');
logit("Verifying RPM binaries");
foreach my $rpmline (@rpms) {
chomp($rpmline);
# We skip cpanel and ea- provided RPM's since those are checked via /usr/local/cpanel/scripts/check_cpanel_pkgs
next if ( $rpmline =~ m/^(ea-|cpanel)/ );
$verify = Cpanel::SafeRun::Timed::timedsaferun( 0, 'rpm', '-V', $rpmline );
chomp($verify);
spin();
push( @BINARIES, $verify ) unless ( $verify eq "" or ! $verify =~ m{bin|sbin} );
}
foreach $binaryline (@BINARIES) {
chomp($binaryline);
( $verify_string, $binary ) = ( split( /\s+/, $binaryline ) );
chomp($verify_string);
chomp($binary);
if ( exists $okbins{$binary} ) {
my $verify_okstring = $okbins{$binary};
if ( $verify_string ne $verify_okstring ) {
push( @SUMMARY,
"> Modified Attribute: $binary [$verify_string]" );
$rpmissues = 1;
}
}
}
if ( $rpmissues == 0 ) {
print_info("No RPM issues found!");
}
logit("Creating summary");
dump_summary();
return;
}
sub disclaimer {
print_normal('');
print_header(
'########################################################################'
);
print_header(
'### DISCLAIMER! cPanel\'s Technical Support does not provide #'
);
print_header(
'### security consultation services. The only support services we #'
);
print_header(
'### can provide at this time is to perform a minimal analysis of the #'
);
print_header(
'### possible security breach solely for the purpose of determining if #'
);
print_header(
'### cPanel\'s software was involved or used in the security breach. #'
);
print_header(
'########################################################################'
);
print_header(
'### As with any anti-malware scanning system false positives may occur #'
);
print_header(
'### If anything suspicious is found, it should be investigated by a #'
);
print_header(
'### professional security consultant. There are never any guarantees #'
);
print_header(
'########################################################################'
);
print_normal('');
}
# BEGIN DEFAULT SCAN HERE!
sub scan {
print_normal('');
print_header('[ Starting cPanel Security Investigator SCAN Mode ]');
print_header("[ System: $OS_RELEASE ]");
print_normal('');
print_header("[ Available flags when running csi.pl scan ]");
print_header(
MAGENTA '[ --full Performs a more compreshensive scan (includes the options below)]' );
print_header( MAGENTA
'[ --shadow Scans all accounts for variants of shadow.roottn email hack ]'
);
print_header(
MAGENTA '[ --symlink Scans for symlink hacks going back to / ]' );
print_header( MAGENTA '[ --secadv Performs a Security Advisor run ]' );
print_normal('');
print_header('[ Checking logfiles ]');
logit("Checking logfiles");
check_logfiles();
print_header('[ Checking for bad UIDs ]');
logit("Checking for bad UIDs");
check_uids();
print_header('[ Checking /etc/passwd file for suspicious users ]');
logit("Checking /etc/passwd for suspicious users");
check_for_suspicious_user();
print_header('[ Checking /etc/hosts file for suspicious entries ]');
logit("Checking /etc/hosts for suspicious entries");
check_hosts_file();
print_header('[ Checking for known Indicators of Compromise (IoC) ]');
logit("Checking for known IoC's");
all_malware_checks();
print_header('[ Checking installed packages for CVEs ]');
logit("Checking installed packages for CVEs");
check_for_cve_vulnerabilities();
print_header('[ Checking if polkit/policykit has been exploited by CVE-2021-4034 ]');
logit("Checking if polkit/policykit has been exploited by CVE-2021-403");
check_for_cve_2021_4034();
print_header('[ Checking for BPFDoor ]');
logit("Checking for BPFDoor");
check_for_bpfdoor();
print_header('[ Checking if Use MD5 passwords with Apache is disabled ]');
logit("Checking if Use MD5 passwords with Apache is disabled");
chk_md5_htaccess();
print_header('[ Checking for index.html in /tmp and /home ]');
logit("Checking for index file in /tmp and $HOMEDIR");
check_index();
print_header('[ Checking for modified suspended page ]');
logit("Checking web template [suspendedpage]");
check_suspended();
print_header('[ Checking for suspicious files ]');
logit("Checking for suspicious files");
look_for_suspicious_files();
print_header('[ Checking if root bash history has been tampered with ]');
logit("Checking roots bash_history for tampering");
check_history();
print_header('[ Checking for open files that have been deleted ]');
logit("Checking for open files that have been deleted");
check_lsof_deleted();
print_header('[ Checking /etc/ld.so.preload for compromised library ]');
check_preload();
print_header('[ Checking process list for suspicious processes ]');
logit("Checking process list for suspicious processes");
check_processes();
print_header('[ Checking for suspicious bitcoin miners ]');
logit("Checking for suspicious bitcoin miners");
bitcoin_chk();
print_header('[ Checking reseller ACLs ]');
logit("Checking reseller ACLs");
check_resellers_for_all_ACL();
print_header(
'[ Checking if /var/cpanel/authn/api_tokens_v2/whostmgr/root.json is IMMUTABLE ]'
);
logit(
"Checking if /var/cpanel/authn/api_tokens_v2/whostmgr/root.json is IMMUTABLE"
);
check_apitokens_json();
print_header(
'[ Checking /usr/local/cpanel/logs/api_tokens_log for passwd changes ]'
);
logit("Checking api_tokens_log for passwd changes");
check_api_tokens_log();
print_header(
'[ Obtaining API Tokens ]'
);
logit("Obtaining api tokens");
get_api_tokens();
print_header('[ Checking for PHP backdoors in unprotected path ]');
logit("Checking /usr/local/cpanel/base/unprotected for PHP backdoors");
check_for_unprotected_backdoors();
print_header('[ Checking for miscellaneous compromises ]');
logit("Checking for miscellaneous compromises");
misc_checks();
check_changepasswd_modules();
print_header('[ Checking Binary Headers ]');
logit("Checking Binary Headers (using hexdump -C)");
check_binaries_for_shell();
print_header('[ Checking Apache Modules ]');
logit("Checking Apache Modules (owned by RPM)");
check_apache_modules();
print_header('[ Checking for sshd_config ]');
logit("Checking sshd_config");
check_sshd_config();
print_header('[ Checking vm.nr.hugepages in /proc/sys/vm ]');
logit("Checking vm.nr.hugepages value");
check_proc_sys_vm();
print_header('[ Checking for modified/hacked SSH ]');
logit("Checking for modified/hacked ssh");
check_ssh();
print_header('[ Checking /root/.bash_history for anomalies ]');
logit("Checking /root/.bash_history");
check_for_TTY_shell_spawns();
check_roots_history();
print_header(
'[ Checking for non-root users with ALL privileges in /etc/sudoers file ]'
);
logit("Checking /etc/sudoers file");
check_sudoers_file();
print_header('[ Checking for spam sending script in /tmp ]');
logit("Checking for spam sending script in /tmp");
spamscriptchk();
print_header('[ Checking for root owned spam sending directory under /usr/local/share/. /ita/ ]');
logit("Checking for root owned spam sending directory under /usr/local/share/. /ita/");
check_for_ita_perl_hack();
print_header('[ Checking user level crons for suspicious entries ]');
logit("Checking user level crons");
user_crons();
print_header('[ Checking for ransomwareEXX ]');
logit("Checking for ransomwareEXX");
check_for_ransomwareEXX();
print_header('[ Checking kernel status ]');
logit("Checking kernel status");
check_kernel_updates();
print_header(
'[ Checking for suspicious MySQL users (Including Super privileges) ]');
logit("Checking for suspicious MySQL users including Super privileges");
check_for_Super_privs();
check_for_mysqlbackups_user();
print_header('[ Checking for unowned files/libraries ]');
logit("Checking for non-owned files/libraries");
check_lib();
print_header('[ Checking /etc/group for suspicious users ]');
logit("Checking /etc/group for suspicious users");
check_etc_group();
if ( $full or $symlink ) {
print_header( YELLOW '[ Additional check for symlink hacks ]' );
logit("Checking for symlink hacks");
check_for_symlinks();
}
if ( $full or $shadow ) {
print_header(
YELLOW '[ Additional check for shadow.roottn.bak hacks ]' );
logit("Checking for shadow.roottn.bak hacks");
chk_shadow_hack();
}
if ( $full ) {
my $yara_available = check_for_yara();
if ($yara_available) {
my $abort_scan=0;
if ( ! $yarascan ) {
my $continue_yara_scan = "This process can cause very high loads and may take a long time!!!";
if ( !IO::Prompt::prompt( $continue_yara_scan . " [y/N]: ", -default => 'n', -yes_no)) {
print_status("User opted to NOT continue with Yara scan!");
logit("User aborted Yara scan");
$abort_scan=1;
}
}
if ( $abort_scan == 0 ) {
my $url = URI->new( 'https://raw.githubusercontent.com/CpanelInc/tech-CSI/master/csi_rules.yara');
my $ua = LWP::UserAgent->new( ssl_opts => { verify_hostname => 0 } );
my $res = $ua->get($url);
my $yara_data = $res->decoded_content;
my @yara_data = split /\n/, $yara_data;
print_header("Downloading csi_rules.yara file to $csidir");
open( YARAFILE, ">$csidir/csi_rules.yara" );
foreach my $yara_line (@yara_data) {
chomp($yara_line);
print YARAFILE $yara_line . "\n";
}
close(YARAFILE);
my @dirs = qw( /bin /sbin /root /boot /etc /lib /lib64 /usr /tmp );
my ( @results, $results );
for my $dir (@dirs) {
chomp($dir);
next unless -d $dir;
print_status("\tScanning $dir directory");
my $loadavg = get_loadavg();
print_status( expand( "\t\t\\_ Yara file: csi_rules.yara [ Load: $loadavg ]") );
$results = Cpanel::SafeRun::Timed::timedsaferun( 0, 'yara', '-fwNr', "$csidir/csi_rules.yara", "$dir" );
my @results = split /\n/, $results;
my $resultcnt = @results;
if ( $resultcnt > 0 ) {
my $showHeader = 0;
foreach my $yara_result (@results) {
chomp($yara_result);
next if ( $yara_result =~ m{.yar|.yara|CSI|rfxn|.hdb|.ndb} );
my ( $triggered_rule, $triggered_file ) = ( split( '\s+', $yara_result ) );
push @SUMMARY, "> A Yara scan found some suspicious files..." unless ( $showHeader );
$showHeader = 1;
push @SUMMARY, expand( "\t\\_ Rule Triggered: " . CYAN $triggered_rule . YELLOW " in the file: " . MAGENTA $triggered_file ) unless ( $triggered_file =~ m/\.yar|\.yara|CSI|rfxn|\.hdb|\.ndb|\/usr\/swpDSK/ );
}
}
}
}
}
}
print_normal(' ');
print_header( GREEN 'Looking for recommendations' );
print_normal(' ');
# Checking for recommendations
print_header('[ Checking if updates are enabled ]');
logit("Checking if updates are enabled");
check_cpupdate_conf();
print_header('[ Checking for mod_security ]');
logit("Checking if ModSecurity is enabled");
check_modsecurity();
print_header('[ Checking for Two-Factor Authentication ]');
logit("Checking if Two-Factor Authentication is enabled");
check_2FA_enabled();
print_header('[ Checking login_access Tweak Setting ]');
logit("Checking login_access Tweak Setting");
check_account_login_access();
print_header('[ Checking for accesshash ]');
logit("Checking for accesshash");
check_for_accesshash();
print_header('[ Checking if SymLinkProtection is enabled ]');
logit("Checking if SymLinkProtection is enabled");
check_if_symlink_protect_on();
print_header('[ Checking setting of Cookie IP Validation ]');
logit("Checking setting of Cookie IP Validation");
check_cookieipvalidation();
print_header( '[ Checking setting of X-Frame/X-Content Type headers with cpsrvd ]');
logit("Checking setting of X-Frame/X-Content Type headers with cpsrvd");
check_xframe_content_headers();
print_header('[ Checking for deprecated plugins/modules ]');
logit("Checking for deprecated plugins");
check_for_deprecated();
print_header( '[ Gathering the IP addresses that logged on successfully as root ]');
logit("Gathering IP address that logged on as root successfully");
get_last_logins_WHM("root");
get_last_logins_SSH("root");
get_root_pass_changes("root");
push( @INFO, CYAN "\nDo you recognize the above IP addresses? If not, then further investigation should be performed\nby a qualified security specialist.");
if ( $full or $secadv ) {
print_header( YELLOW '[ Additional check Security Advisor ]' );
logit("Running Security Advisor");
security_advisor();
}
print_header('[ cPanel Security Investigator Complete! ]');
logit( 'cPanel Security Investigator Complete!' );
print_header('[ CSI Summary ]');
print_normal('');
dump_summary();
}
sub check_previous_scans {
print_info("CSI version: $version");
print_status('Running in debug mode - Extrenuous output will be present') if ( $debug );
logit('Running in debug mode') if ( $debug );
if ( $overwrite ) {
unlink( "$csidir/csi.log" );
return;
}
print_status('Checking for a previous run of CSI');
if ( -d $csidir ) {
logit( 'Previous CSI directory found, backing up and creating a new one' );
chomp( my $date = Cpanel::SafeRun::Timed::timedsaferun( 0, 'date', "+%Y-%m-%d-%H:%M:%S" ) );
print_info("Existing $csidir is present, moving to $csidir-$date");
rename "$csidir", "$csidir-$date";
mkdir( "$csidir", 0755 );
}
return;
}
sub check_kernel_updates {
if ( Cpanel::Version::compare( Cpanel::Version::getversionnumber(), '<', '11.102.0.0')) {
use Cpanel::Kernel::GetDefault;
my $boot_kernelversion = Cpanel::Kernel::GetDefault::get();
my $running_kernelversion = Cpanel::Kernel::get_running_version();
my $has_kernelcare=0;
my $reboot_required=0;
$has_kernelcare if ( Cpanel::KernelCare::kernelcare_responsible_for_running_kernel_updates() );
if ( $running_kernelversion ne $boot_kernelversion ) {
$reboot_required=1;
if ($has_kernelcare) {
if ($reboot_required) {
push @SUMMARY, "> KernelCare installed but running kernel version does not match boot version (contact provider):";
push @SUMMARY, expand( CYAN "\t \\_ Running Version: [ " . $running_kernelversion . " ]" );
push @SUMMARY, expand( CYAN "\t \\_ Boot Version: [ " . $boot_kernelversion . " ]" );
}
}
else {
push @RECOMMENDATIONS, "> Running kernel version does not match boot version (a reboot is required)";
push @RECOMMENDATIONS, expand( CYAN "\t \\_ Running Version: [ " . $running_kernelversion . " ]" );
push @RECOMMENDATIONS, expand( CYAN "\t \\_ Boot Version: [ " . $boot_kernelversion . " ]" );
}
}
}
else { ## 102+
my $KernelStatus = Cpanel::Kernel::Status::kernel_status();
if ( $KernelStatus->{has_kernelcare} ) {
if ( $KernelStatus->{running_version} ne $KernelStatus->{boot_version} ) {
push @SUMMARY, "> KernelCare installed but running kernel version does not match boot version (contact provider):";
push @SUMMARY, expand( CYAN "\t \\_ Running Version: [ " . $KernelStatus->{running_version} . " ]" );
push @SUMMARY, expand( CYAN "\t \\_ Boot Version: [ " . $KernelStatus->{boot_version} . " ]" );
}
}
else {
if ( $KernelStatus->{reboot_required} ) {
push @RECOMMENDATIONS, "> Running kernel version does not match boot version (a reboot is required)";
push @RECOMMENDATIONS, expand( CYAN "\t \\_ Running Version: [ " . $KernelStatus->{running_version} . " ]" );
push @RECOMMENDATIONS, expand( CYAN "\t \\_ Boot Version: [ " . $KernelStatus->{boot_version} . " ]" );
}
}
}
}
sub check_logfiles {
my $apachelogpath;
if ($EA4) {
$apachelogpath = "/etc/apache2/logs";
}
else {
$apachelogpath = "/usr/local/apache/logs";
}
chomp($apachelogpath);
if ( !-d $apachelogpath ) {
push @SUMMARY, "> $apachelogpath directory is not present";
}
foreach my $log (@logfiles) {
if ( !-f $log ) {
push @SUMMARY, "> Log file $log is missing or not a regular file";
}
elsif ( -z $log ) {
# Check if journal logging is enabled. If so, these may be empty on purpose.
my $HasJournalLogging = "";
if ( -e "/run/systemd/journal/syslog" ) {
$HasJournalLogging =
" [ Might be configured to use imJournal ]";
}
push @SUMMARY,
"> Log file $log exists, but is empty $HasJournalLogging";
}
}
}
sub check_index {
if ( -f '/tmp/index.htm' or -f '/tmp/index.html' ) {
push @SUMMARY, '> Index file found in /tmp';
}
}
sub check_suspended {
if ( -f '/var/cpanel/webtemplates/root/english/suspended.tmpl' ) {
push @SUMMARY,
'> Custom account suspended template found at /var/cpanel/webtemplates/root/english/suspended.tmpl';
push @SUMMARY,
' This could mean the admin just created a custom template or that an attacker gained access';
push @SUMMARY, ' and created it (hack page)';
}
}
sub check_history {
if ( -e '/root/.bash_history' ) {
if ( -l '/root/.bash_history' ) {
my $result = Cpanel::SafeRun::Timed::timedsaferun( 0, 'ls', '-la', '/root/.bash_history' );
push @SUMMARY, "> /root/.bash_history is a symlink, $result";
}
my $attr = isImmutable("/root/.bash_history");
my $lcisImmutable = "";
if ($attr) {
push @SUMMARY, "> /root/.bash_history is set to " . CYAN "[ IMMUTABLE ]";
}
if ( !-s '/root/.bash_history' and !-l '/root/.bash_history' ) {
push @SUMMARY, "> /root/.bash_history is a 0 byte file";
}
# Load /root/.bash_history into @HISTORY array
open( HISTORY, "/root/.bash_history" );
@HISTORY = <HISTORY>;
close(HISTORY);
}
else {
push @SUMMARY,
"> /root/.bash_history is not present, this indicates possible root-level compromise";
}
}
sub check_modsecurity {
my $resultJSON = get_whmapi1('modsec_is_installed');
if ( !$resultJSON->{data}->{data}->{installed} ) {
push @RECOMMENDATIONS, "> Mod Security is disabled";
return;
}
my $modsec_vendorsJSON = get_whmapi1('modsec_get_vendors');
my $rules_found = 0;
for my $modsec_vendor ( @{ $modsec_vendorsJSON->{data}->{vendors} } ) {
if ( $modsec_vendor->{cpanel_provided} ) {
if ( !defined( $modsec_vendor->{is_rpm} ) ) {
push @RECOMMENDATIONS,
"> Using $modsec_vendor->{description} YAML rules - Please consider using the RPM\n"
. CYAN expand( "\t\\_ yum install ea-modsec2-rules-owasp-crs" )
unless ( $distro eq "ubuntu" );
}
if ( !defined( $modsec_vendor->{is_pkg} ) ) {
push @RECOMMENDATIONS,
"> Using $modsec_vendor->{description} YAML rules - Please consider using the RPM\n"
. CYAN expand( "\t\\_ apt install ea-modsec2-rules-owasp-crs" )
unless ( $distro ne "ubuntu" );
}
if ( $modsec_vendor->{enabled} == 0 ) {
push @RECOMMENDATIONS,
"> The $modsec_vendor->{description} is installed but not enabled\n\t\\_ Please consider running "
. CYAN
"/usr/local/cpanel/scripts/modsec_vendor enable OWASP3";
}
}
$rules_found = 1;
}
if ( !$rules_found ) {
push @RECOMMENDATIONS,
"> Mod Security is installed but there were no active Mod Security vendor rules found.";
}
}
sub check_2FA_enabled {
my $resultJSON = get_whmapi1('twofactorauth_policy_status');
if ( !$resultJSON->{data}->{is_enabled} ) {
push @RECOMMENDATIONS,
"> Two-Factor Authentication Policy is disabled - Consider enabling this.";
return;
}
}
sub check_account_login_access {
my $resultJSON =
get_whmapi1( 'get_tweaksetting', 'key=account_login_access' );
if ( $resultJSON->{data}->{tweaksetting}->{value} =~ m/owner|owner_root/ ) {
push @RECOMMENDATIONS,
"> Consider changing Accounts that can access cPanel user account to "
. CYAN "cPanel User Only.";
}
}
sub check_uids {
my @baduids;
while ( my ( $user, $pass, $uid, $gid, $group, $home, $shell ) =
getpwent() )
{
if ( $uid == 0 && $user ne 'root' ) {
push( @baduids, $user );
}
if ( $user eq 'firefart' ) {
push @SUMMARY,
"> firefart user found [Possible DirtyCow root-level compromise].";
}
if ( $user eq 'sftp' ) {
push @SUMMARY,
"> sftp user found [Possible HiddenWasp root-level compromise].";
}
}
endpwent();
if (@baduids) {
push @SUMMARY, '> Users with UID of 0 detected:';
foreach (@baduids) {
push( @SUMMARY, expand( CYAN "\t \\_ " . $_ ) );
get_last_logins_WHM($_);
get_last_logins_SSH($_);
get_root_pass_changes($_);
}
}
}
sub check_for_TTY_shell_spawns {
my $histline;
foreach $histline (@HISTORY) {
chomp($histline);
if ( $histline =~
m/pty.spawn("\/bin\/sh")|pty.spawn\("\/bin\/bash"\)|os.system\('\/bin\/bash'\)|os.system\('\/bin\/sh'\)|\/bin\/sh -i|\/bin\/bash -i|cpuminer-gr-avx2/
)
{
push( @SUMMARY,
"> Found evidence in /root/.bash_history of a possible TTY shell being spawned"
);
push( @SUMMARY, expand( "\t \\_ $histline\n" ) );
}
}
}
sub check_roots_history {
my $histline;
foreach $histline (@HISTORY) {
chomp($histline);
if ( $histline =~
m/\etc\/cxs\/uninstall.sh|rm -rf \/etc\/apache2\/conf.d\/modsec|bash \/etc\/csf\/uninstall.sh|yum remove -y cpanel-clamav|remove bcm-agent/
)
{
push( @SUMMARY,
"> Suspicious entries found in /root/.bash_history" );
push( @SUMMARY, expand( "\t\\_ $histline" ) );
}
}
}
sub check_processes {
my $url = URI->new( 'https://raw.githubusercontent.com/CpanelInc/tech-CSI/master/suspicious_procs.txt');
my $ua = LWP::UserAgent->new( ssl_opts => { verify_hostname => 0 } );
my $res = $ua->get($url);
my $susp_procs = $res->decoded_content;
my @susp_procs = split /\n/, $susp_procs;
my $headerPrint = 0;
foreach my $suspicious_process (@susp_procs) {
chomp($suspicious_process);
next if ( _ignore_susp_proc( $suspicious_process ) );
foreach my $line(@process_list) {
chomp($line);
if ( $line =~ m/$suspicious_process/ ) {
my ( $u, $p, $c ) = (split /\s+/, $line );
my ( $a1,$a2,$a3,$a4,$a5,$a6,$a7 ) = (split( /\s+/, $line ))[3,4,5,6,7,8,9];
my $a = $a1 . " " . $a2 . " " . $a3 . " " . $a4 . " " . $a5 . " " . $a6 . " " . $a7;
push @SUMMARY, "> The following suspicious process was found (please verify)" unless ( $headerPrint == 1 );
$headerPrint = 1;
push @SUMMARY, CYAN expand( "\t\\_ Found suspicious process " . YELLOW $suspicious_process . CYAN " running" );
push @SUMMARY, "\t\\_ " . MAGENTA "User: " . YELLOW $u . MAGENTA " / Pid: " . YELLOW $p . MAGENTA " / Command: " . YELLOW $c . MAGENTA " / Arguments: " . YELLOW $a;
my $proclink = '/proc/' . $p . '/exe';
if ( -l $proclink && readlink( $proclink ) ) {
push @SUMMARY, "\t\\_ " . YELLOW $proclink . " -> " . RED readlink($proclink) . CYAN " - Checking this binary at VirusTotal.com";
vtlink(readlink( $proclink ));
}
}
}
}
return;
}
sub _ignore_susp_proc {
my $tcProc = shift;
return 1 if ( $tcProc =~ m{log4j} && -e '/usr/bin/log4j-cve-2021-44228-hotpatch' );
return 1 if ( $tcProc =~ m{log4j} && -d '/home/cpanelsolr/server/lib/ext/' );
return 0;
}