Web based format injection, dumping memory like it's 99 (or "Please help")

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@fransrosen Web based format injection, dumping memory like it's 99 or "Please help"

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@fransrosen Public Bug Bounty

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@fransrosen RCE is 30,000 USD

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@fransrosen Methodology • Found a domain not like the other ones

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@fransrosen Methodology • Found a domain not like the other ones • Legacy on-premise PHP-app acquired by a huge tech organization

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@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

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@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 👍 👍 👍

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@fransrosen Methodology • Google + GitHub etc

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@fransrosen Methodology • Google + GitHub etc

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@fransrosen Methodology • Google + GitHub etc

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@fransrosen Methodology • Google + GitHub etc

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@fransrosen Methodology • Google + GitHub etc • wfuzz!

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@fransrosen Methodology • Google + GitHub etc • wfuzz! Interesting path: /cgi-bin/default/

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@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

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@fransrosen Methodology • Google + GitHub etc • wfuzz!

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@fransrosen Methodology • Google + GitHub etc • wfuzz! /cgi-bin/default/php/

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@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

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@fransrosen Methodology • Google + GitHub etc • wfuzz!

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@fransrosen xml_api?

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@fransrosen xml_api?

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@fransrosen xml_api? YEAH! 👍

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@fransrosen wtf!?

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@fransrosen XXE!

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@fransrosen XXE!

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@fransrosen XXE!

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@fransrosen XXE!

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@fransrosen XXE!

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@fransrosen XXE! ]> &exl; 

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@fransrosen XXE! ]> &exl; 

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@fransrosen XXE! %exl; ]>

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@fransrosen XXE! %exl; ]>

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@fransrosen XXE! %exl; ]> ???

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@fransrosen

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@fransrosen XXE! ]>

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@fransrosen XXE! ]>

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@fransrosen XXE!

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@fransrosen XXE!

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@fransrosen XXE! WOAH.

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@fransrosen Format String Injection?

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@fransrosen Format String Injection ON ZE WEB?

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@fransrosen Format String Injection http://www.cis.syr.edu/~wedu/Teaching/cis643/LectureNotes_New/Format_String.pdf

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@fransrosen Format String Injection

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@fransrosen Format String Injection

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@fransrosen I can’t handle this shit

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@fransrosen Help me, zetatwo

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@fransrosen Help me, zetatwo

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@fransrosen Help me, zetatwo

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@fransrosen zetatwo: latin1!

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@fransrosen zetatwo: latin1!

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@fransrosen Limitations 0x20-0xFF (no 0x22)

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@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xﬀ

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@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xﬀ

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@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xﬀ

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@fransrosen Limitations 0x09 0x0a 0x0d + 0x20-0x21 + 0x23-0xﬀ

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@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 \ ’  ]>  '

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@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 \ ’  ]>  '

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@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."

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@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."

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@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."