{"id":317,"date":"2021-12-07T10:25:39","date_gmt":"2021-12-07T02:25:39","guid":{"rendered":"https:\/\/www.langsasec.cn\/?p=317"},"modified":"2022-11-14T17:57:14","modified_gmt":"2022-11-14T09:57:14","slug":"uploadshell","status":"publish","type":"post","link":"https:\/\/blog.langsasec.cn\/index.php\/2021\/12\/07\/uploadshell\/","title":{"rendered":"\u6587\u4ef6\u4e0a\u4f20\u7ed5\u8fc7"},"content":{"rendered":"

\u4e00\u53e5\u8bdd\u6728\u9a6c<\/strong><\/p>\n

PHP:    \n<?php @eval($_POST['chopper']);?>\n\nASP:    \n<%eval request("chopper")%>\n\nASP.NET:    \n<%@ Page Language="Jscript"%><%eval(Request.Item["z"],"unsafe");%><\/code><\/pre>\n
\u56fe\u7247\u9a6c\u5236\u4f5c<\/strong>\uff1acopy 1.jpg \/b + 1.txt \/a 2.jpg\uff081.txt\u4e3a\u4e00\u53e5\u8bdd\u6728\u9a6c\uff0c2.jpg\u65b0\u751f\u6210\u7684\u56fe\u7247\u9a6c\uff09<\/p>\n
\u6587\u4ef6\u4e0a\u4f20\u9632\u5fa1<\/strong>\uff1a<\/p>\n
1.\u56fe\u5e8a\uff08A\u7f51\u7ad9\u4e0a\u4f20\u56fe\u7247\u653e\u5230\u53e6\u4e00\u4e2a\u7f51\u7ad9\u6216\u670d\u52a1\u5668\uff09<\/p>\n
2.\u52a0\u5f3a\u68c0\u6d4b*\uff08\u767d\u540d\u5355+\u5185\u5bb9\u68c0\u6d4b+\u6743\u9650\u8bbe\u7f6e+\u5b89\u5168\u4e2d\u95f4\u4ef6\uff09<\/p>\n
\u5982\u679c\u6ca1\u6709\u9632\u62a4\u89c4\u5219\u7684\u6587\u4ef6\u4e0a\u4f20\uff0c\u53ea\u8981\u4e0a\u4f20\u5c31\u53ef\u4ee5\u62ff\u4e0b\u76ee\u6807<\/em><\/strong><\/p>\n
\u68c0\u6d4b\u6076\u610f\u4ee3\u7801\uff1a<\/p>\n
\u200b   \u524d\u7aef\u68c0\u6d4b\uff08js\uff09= \u6ca1\u6709\u68c0\u6d4b<\/p>\n
\u200b   \u540e\u7aef\u68c0\u6d4b\uff1a\u9ed1\u767d\u540d\u5355\u673a\u5236\uff08\u6bd4\u8f83\u5371\u9669\uff09\uff0c\u767d\u540d\u5355\u66f4\u5b89\u5168<\/p>\n
\u670d\u52a1\u7aef\u68c0\u6d4b\u51e0\u4e2a\u5e38\u89c1\u7684\u624b\u6bb5\uff1a \u68c0\u67e5Content-Type \uff08\u5185\u5bb9\u7c7b\u578b\uff09 \u68c0\u67e5\u540e\u7f00  \uff08\u68c0\u67e5\u540e\u7f00\u662f\u4e3b\u6d41\uff09 \u68c0\u67e5\u6587\u4ef6\u5934<\/p>\n
\u6587\u4ef6\u4e0a\u4f20\u6d41\u7a0b\uff1a<\/strong><\/p>\n
\u4e0a\u4f20\uff0c\u68c0\u6d4b\uff0c\u4e0a\u4f20\u5230\u7f13\u5b58\u6587\u4ef6(tmp)\uff0c\u540e\u7aef\u4ee3\u7801\u79fb\u52a8\uff0c\u79fb\u52a8\u5230\u6307\u5b9a\u76ee\u5f55\u91cd\u547d\u540d<\/strong><\/p>\n
<\/span>\u6587\u4ef6\u4e0a\u4f20\u7ed5\u8fc7<\/span><\/h2>\n
<\/span>1.\u524d\u7aef\u9a8c\u8bc1\u7ed5\u8fc7<\/span><\/h4>\n
\u6293\u8fd4\u56de\u5305\u5220\u9664js(Do intercept)<\/p>\n
\u6293\u5305\u6539\u540e\u7f00\uff08\u4e0a\u4f20\u6b63\u5e38\u6587\u4ef6\u6216\u56fe\u7247\uff0c\u6570\u636e\u5305\u4e2d\u6539\u6728\u9a6c\u540e\u7f00\uff09<\/p>\n
<\/span>2.Content-Type\u65b9\u5f0f\u7ed5\u8fc7<\/span><\/h4>\n
\u68c0\u67e5\u6587\u4ef6\u7c7b\u578b\uff0c\u6293\u5305\u6539\u540e\u7f00\uff08\u4e0a\u4f20\u6b63\u5e38\u6587\u4ef6\u6216\u56fe\u7247\uff0c\u6570\u636e\u5305\u4e2d\u6539\u6728\u9a6c\u540e\u7f00\uff09<\/p>\n
<\/span>3.\u9ed1\u540d\u5355\u7ed5\u8fc7<\/span><\/h4>\n
\u9ed8\u8ba4\u72b6\u6001\u4e0b.php3,.php4,.php5,.phtml \u90fd\u662f\u4f1a\u88ab\u89e3\u6790\u4e3aphp\u7684\uff0c<\/p>\n\n\n\n\n\n\n\n\n
<\/th>\n\u5176\u4ed6\u80fd\u88ab\u89e3\u6790\u7684\u6269\u5c55<\/th>\n<\/th>\n<\/th>\n<\/tr>\n<\/thead>\n
jsp<\/td>\njspx<\/td>\njspf<\/td>\n<\/td>\n<\/tr>\n
asp<\/td>\nasa<\/td>\ncer<\/td>\naspx<\/td>\n<\/tr>\n
php<\/td>\nphptml<\/td>\nphp3<\/td>\nphp4<\/td>\n<\/tr>\n
exe<\/td>\nexee<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/span>4..htaccess\u6587\u4ef6\u7ed5\u8fc7<\/span><\/h4>\n
.htaccess\u662f\u4ec0\u4e48\uff1f\u5168\u79f0\u662fHypertext Access(\u8d85\u6587\u672c\u5165\u53e3)  .htaccess\u6587\u4ef6\u4e5f\u88ab\u6210\u4e3a\u5206\u5e03\u5f0f\u914d\u7f6e\u6587\u4ef6<\/p>\n
.htaccess\u529f\u80fd\uff08\u9ed8\u8ba4\u662f\u4e0d\u5f00\u542f\u7684\uff0c\u4f2a\u9759\u6001\u7f51\u7ad9\u4e00\u822c\u4f1a\u5f00\u542f\uff09\uff1a \u6587\u4ef6\u5939\u5bc6\u7801\u4fdd\u62a4\u3001\u7528\u6237\u81ea\u5b9a\u4e49\u91cd\u5b9a\u5411\u3001\u81ea\u5b9a\u4e49404\u9875\u9762\u3001\u6269\u5c55\u540d\u4f2a\u9759\u6001\u5316\u3001\u7981\u6b62\u7279\u5b9aIP\u5730\u5740\u7684\u7528\u6237\u3001\u53ea\u5141\u8bb8\u7279\u5b9aIP\u5730\u5740\u7684\u7528\u6237\u3001\u7981\u6b62\u76ee\u5f55\u5217\u8868<\/p>\n
\u4f8b\u5982\uff1aAddType application\/x-httpd-php .jpg<\/strong>    \u8fd9\u4e2a\u6307\u4ee4\u4ee3\u8868\u7740.jpg\u6587\u4ef6\u4f1a\u5f53\u505aphp\u6765\u89e3\u6790<\/p>\n
cmd\u91cd\u547d\u540d\uff1aren \u6587\u4ef6 .htaccess<\/p>\n
\u65b9\u6cd5\uff1a\u4e0a\u4f20\u56fe\u7247\u9a6c.jpg\u540e\u518d\u4e0a\u4f20AddType application\/x-httpd-php .jpg\u5185\u5bb9\u7684.htaccess\u6587\u4ef6\u5373\u53ef\u5c06\u56fe\u7247\u9a6c\u4f5c\u4e3aphp\u8fde\u63a5\u6210\u529f\u3002<\/p>\n
<\/span>5.\u540e\u7f00\u5927\u5c0f\u5199\u7ed5\u8fc7<\/span><\/h4>\n
WEB\u5bb9\u5668\u9664\u975e\u975e\u5e38\u8001\u7684\u7248\u672c\uff0c\u4e0d\u7136\u90fd\u4e0d\u533a\u5206\u5927\u5c0f\u5199<\/p>\n
\u4f8b\u5982php.php=>php.PhP\/PHp<\/p>\n
<\/span>6.\u6587\u4ef6\u540e\u7f00\uff08\u7a7a\uff09\u7ed5\u8fc7<\/span><\/h4>\n
\u9ed1\u540d\u5355\u4e2d\u6ca1\u6709\u8fc7\u6ee4\u7a7a\u503c\uff0c\u90a3\u4e48php\u548cphp\u7a7a\u683c\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u6293\u5305\u6587\u4ef6\u540d\u540e\u7f00\u6dfb\u52a0\u7a7a\u683c\u5373\u53ef\u7ed5\u8fc7<\/p>\n
<\/span>7.\u6587\u4ef6\u540e\u7f00\uff08\u70b9\uff09\u7ed5\u8fc7<\/span><\/h4>\n
\u4e0e6\u7c7b\u4f3c\uff0cwindows<\/strong>\u6709\u4e00\u4e2a\u7279\u6027\uff0c\u4f1a\u81ea\u52a8\u53bb\u6389\u540e\u7f00\u540d\u6700\u540e\u7684\u70b9\u3002<\/p>\n
\u6587\u4ef6\u540d.php.\u548c\u6587\u4ef6\u540d.php\u76f8\u540c\u3002\u6293\u5305\u6587\u4ef6\u540d\u540e\u7f00\u6dfb\u52a0\u70b9\u5373\u53ef\u7ed5\u8fc7<\/p>\n
<\/span>8.::$DATA\uff08Windows\u6587\u4ef6\u6d41\u7ed5\u8fc7\uff09<\/span><\/h4>\n
\u5229\u7528\u5230\u4e86NTFS\u4ea4\u6362\u6570\u636e\u6d41\uff08ADS\uff09\uff0cADS\u662fNTFS\u78c1\u76d8\u683c\u5f0f\u7684\u4e00\u4e2a\u7279\u6027\uff0c\u5728NTFS\u6587\u4ef6\u7cfb\u7edf\u4e0b\uff0c\u6bcf\u4e2a\u6587\u4ef6\u90fd\u53ef\u4ee5\u5b58\u5728\u591a\u4e2a\u6570\u636e\u6d41\u3002<\/p>\n
\u4e5f\u5c31\u662f\u5176\u5b83\u6587\u4ef6\u53ef\u4ee5\u201c\u5bc4\u5bbf\u201d\u5728\u67d0\u4e2a\u6587\u4ef6\u8eab\u4e0a\uff0c\u800c\u5728\u8d44\u6e90\u7ba1\u7406\u5668\u4e2d\u5374\u53ea\u80fd\u770b\u5230\u5bbf\u4e3b\u6587\u4ef6\uff0c\u627e\u4e0d\u5230\u5bc4\u5bbf\u6587\u4ef6\u3002\uff08\u9690\u85cf\u7684\u5bc4\u751f\u866b\uff09<\/strong><\/p>\n
\u4f8b\u5982\uff1aa.txt::$DATA ::$DATA\u5c31\u662f\u9ed8\u8ba4\u4e0d\u4fee\u6539\u6587\u4ef6\u6d41\u7684\u60c5\u51b5 \u6240\u4ee5\u751f\u6210\u4e00\u4e2a\u6b63\u5e38\u7684a.txt\u3002\u4f46\u540e\u7aef\u68c0\u6d4b\u7684\u65f6\u5019a.txt::$DATA\u548ca.txt\u662f\u4e0d\u4e00\u6837\uff0c\u4ece\u800c\u7ed5\u8fc7\u3002<\/p>\n
\u85cf\u6587\u4ef6\uff1aecho \u5185\u5bb9 > \u88ab\u4f9d\u9644\u7684\u6587\u4ef6:\u65b0\u5efa\u6587\u4ef6<\/p>\n
<\/span>9.\u6784\u9020\u6587\u4ef6\u540e\u7f00\u7ed5\u8fc7<\/span><\/h4>\n
strrchr() \u51fd\u6570\u67e5\u627e\u5b57\u7b26\u4e32\u5728\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u5e76\u8fd4\u56de\u4ece\u8be5\u4f4d\u7f6e\u5230\u5b57\u7b26\u4e32\u7ed3\u5c3e\u7684\u6240\u6709\u5b57\u7b26\u3002<\/p>\n
$file_ext = strrchr($file_name, '.'); \u662f\u68c0\u6d4b\u672b\u5c3e\u6700\u540e\u662f\u5426\u662f\u70b9\uff0c\u8fd4\u56de\u70b9\u4ee5\u53ca\u540e\u9762\u7684\u90e8\u5206\u3002<\/p>\n
php. .,\u4e5f\u5c31\u662f\u6587\u4ef6\u540d.php\u70b9\u7a7a\u70b9\u3002<\/p>\n
\u53bb\u6389\u70b9\u2192\u8fd4\u56de\u70b9\u7a7a\u2192\u6700\u540e\u5269\u4e0b \u6587\u4ef6\u540d.php.\u53ef\u4ee5\u89e3\u6790\uff0c\u5b8c\u7f8e\u7ed5\u8fc7\u3002<\/strong><\/p>\n
<\/span>10.\u53cc\u5199\u6587\u4ef6\u540e\u7f00\u7ed5\u8fc7<\/span><\/h4>\n
$file_name = str_ireplace($deny_ext,"", $file_name);\n\u5c06\u654f\u611f\u540e\u7f00\u66ff\u6362\u4e3a\u7a7a\n\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u53cc\u5199\u7ed5\u8fc7\uff0ceg:pphphp=>php<\/code><\/pre>\n
<\/span>11.%00\u622a\u65ad\u7ed5\u8fc7<\/span><\/h4>\n
%00\uff08url\u7f16\u7801\uff09:\u8868\u793a\u7ed3\u675f<\/p>\n
\u4e0a\u4f20\u8fc7\u7a0b\u4e2d\u88ab\u91cd\u547d\u540d\uff0c\u540e\u9762\u6dfb\u52a0\u4e3a\u81ea\u5b9a\u7684\u540d\u79f0\u683c\u5f0f\u5e76\u622a\u65ad\u5373\u53ef\u4e0a\u4f20\u6210\u529f\u3002<\/p>\n
\u5c5e\u4e8ephp5.3\u4ee5\u4e0b\u7684\u4e00\u4e2a\u6f0f\u6d1e<\/p>\n
$img_path = $_GET['save_path']."\/".rand(10, 99).date("YmdHis").".".$file_ext;<\/code><\/pre>\n
<\/span>12.00\u622a\u65ad\u7ed5\u8fc7<\/span><\/h4>\n
get\u4f20\u53c2\u53d8\u4e3apost,\u901a\u8fc7\u4fee\u6539hex\u7f16\u7801\u4f7f\u5f97\u622a\u65ad\u5f62\u6210\uff0c\u5b8c\u6210\u7ed5\u8fc7\u3002<\/p>\n
00(Hex)\uff1a\u8868\u793a\u7ed3\u675f<\/p>\n
<\/span>13.\u56fe\u7247\u9a6c\u7ed5\u8fc7<\/span><\/h4>\n
<\/span>14.getimagesize\u56fe\u7247\u7c7b\u578b\u7ed5\u8fc7<\/span><\/h4>\n
getimagesize() \u51fd\u6570\u7528\u4e8e\u83b7\u53d6\u56fe\u50cf\u5927\u5c0f\u53ca\u76f8\u5173\u4fe1\u606f\uff0c\u6210\u529f\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u5931\u8d25\u5219\u8fd4\u56de FALSE \u5e76\u4ea7\u751f\u4e00\u6761 E_WARNING \u7ea7\u7684\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n
<\/span>15.php_exif\u6a21\u5757\u56fe\u7247\u7c7b\u578b\u7ed5\u8fc7<\/span><\/h4>\n
<\/span>16.\u4e8c\u6b21\u6e32\u67d3\u7ed5\u8fc7<\/span><\/h4>\n
\u4e00\u822c\u6e32\u67d3\u4e0d\u4f1a\u6e32\u67d3\u56fe\u7247\u7684\u6240\u6709\u90e8\u5206\u3002<\/p>\n
\u5229\u7528gif\u52a8\u6001\u56fe\u56fe\u7247\u9a6c\u7ed5\u8fc7\uff0c\u5728\u7b2c\u4e09\u884c\u7b2c\u56db\u884c\u6dfb\u52a0\u6bd4\u8f83\u597d\u3002<\/p>\n
<\/span>17.\u6761\u4ef6\u7ade\u4e89\u7ed5\u8fc7<\/span><\/h4>\n
\u2460\u5148\u4e0a\u4f20\u540e\u68c0\u6d4b\uff1a\u62fc\u901f\u5ea6\u4ee5\u81f3\u4e8e\u6765\u4e0d\u53ca\u5220\u9664<\/p>\n
\u7ade\u4e89\u6761\u4ef6\uff1a\u201d\u53d1\u751f\u5728\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4e2a\u5171\u4eab\u4ee3\u7801\u3001\u53d8\u91cf\u3001\u6587\u4ef6\u7b49\u6ca1\u6709\u8fdb\u884c\u9501\u64cd\u4f5c\u6216\u8005\u540c\u6b65\u64cd\u4f5c\u7684\u573a\u666f\u4e2d\u3002<\/strong><\/p>\n
\u5bf9php\u505a\u624b\u811a\uff0c\u5728php\u63d2\u5165\u65b0\u5efa\u6587\u4ef6\u7684\u4ee3\u7801<\/p>\n
<?php file_put_contents('123.php','<?php @eval($_REQUEST[8])?>');?><\/code><\/pre>\n
\u672c\u5730\u6d4b\u8bd5\u53d1\u73b0\u8bbf\u95ee\u8be5php\u5373\u53ef\u751f\u6210\u4e00\u53e5\u8bdd\u6728\u9a6c123.php<\/p>\n
\"img\"<\/p>\n
\u6211\u4eec\u7528burp\u6a21\u5757\u6293\u5305\u7136\u540e\u53bb\u7206\u7834\u5c31\u884c\uff0c\u4e00\u4e2a\u4e0d\u65ad\u4e0a\u4f20\uff0c\u4e00\u4e2a\u4e0d\u65ad\u8bbf\u95ee<\/p>\n
\"img\"<\/p>\n
\u76f4\u5230\u80fd\u591f\u8bbf\u95ee\u5230123.php\u5373\u53ef\u8fde\u63a5\u6728\u9a6c\u7ba1\u7406\u3002<\/p>\n
\u2461\u5148\u68c0\u6d4b\u540e\u4e0a\u4f20<\/p>\n
<\/span>18.\u6761\u4ef6\u7ade\u4e89\uff08\u4e8c\uff09<\/span><\/h4>\n
\u4e0e7\u76f8\u540c\uff0c\u53ea\u4e0d\u8fc7\u4e0a\u4f20\u7684\u662f\u56fe\u7247\u9a6c<\/p>\n
<\/span>19.move_uploaded_file()\u622a\u65ad\uff08\u53e6\u4e00\u4e2a00\u622a\u65ad\uff09<\/span><\/h4>\n
move_uploaded_file() \uff0c\u8fd9\u662f\u79fb\u52a8\u6587\u4ef6\u7684\u51fd\u6570\uff0c\u4e0a\u4f20\u4e0a\u53bb\u7136\u540e\u79fb\u52a8\u5230\u8fd9\u8fb9\u91cd\u547d\u540d<\/p>\n
\u4fee\u6539\u540e\u7f00\uff0c\u7528hex\u7f16\u8f9100\u5728php\u540e\u622a\u65ad<\/p>\n
<\/span>\u6587\u4ef6\u4e0a\u4f20\u89e3\u6790\u6f0f\u6d1e<\/span><\/h3>\n
<\/span>IIS6.0\u89e3\u6790\u6f0f\u6d1e\uff08\u4e00\uff09\uff1a<\/span><\/h4>\n
\u200b   IIS6.0\u9664\u4e86\u5c06ASP\u540e\u7f00\u5f53\u505aASP\u8fdb\u884c\u89e3\u6790\u7684\u540c\u65f6\uff0c\u5f53\u6587\u4ef6\u540e\u7f00\u540d\u5b57\u4e3a.asa .cer .cdx \u4e5f\u4f1a\u5f53\u505aasp\u53bb\u89e3\u6790\uff0c\u8fd9\u662f\u56e0\u4e3aIIS6.0\u5728\u5e94\u7528\u7a0b\u5e8f\u6269\u5c55\u4e2d\u9ed8\u8ba4\u8bbe\u7f6e\u4e86.asa .cer .cdx \u90fd\u4f1a\u8c03\u7528 asp.dll\u3002<\/p>\n
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