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
駭客看 Django
Search
Orange
May 26, 2013
Technology
25
13k
駭客看 Django
Taiwan Python Conference 2013
Orange
May 26, 2013
Tweet
Share
More Decks by Orange
See All by Orange
Best Practices - The Upload
p8361
0
76
Security in PHP 那些在滲透測試的小技巧
p8361
0
160
網頁安全 Web Security 入門
p8361
0
160
Bug Bounty 獎金獵人甘苦談 - 那些年我回報過的漏洞
p8361
13
36k
那些 Web Hacking 中的奇技淫巧
p8361
16
14k
關於 HITCON CTF 的那些事 之 Web 狗如何在險惡的 CTF 世界中存活?
p8361
6
13k
PHPConf 2013 - 矛盾大對決
p8361
53
28k
0-Day 輕鬆談 - Happy Fuzzing Internet Explorer
p8361
15
12k
Other Decks in Technology
See All in Technology
Amazon Bedrock AgentCoreのフロントエンドを探す旅 (Next.js編)
kmiya84377
1
100
マルチプロダクト×マルチテナントを支えるモジュラモノリスを中心としたアソビューのアーキテクチャ
disc99
0
280
Google Agentspaceを実際に導入した効果と今後の展望
mixi_engineers
PRO
2
330
JAWS AI/ML #30 AI コーディング IDE "Kiro" を触ってみよう
inariku
3
270
「育てる」サーバーレス 〜チーム開発研修で学んだ、小さく始めて大きく拡張するAWS設計〜
yu_kod
1
250
o11yツールを乗り換えた話
tak0x00
1
120
AI人生苦節10年で会得したAIがやること_人間がやること.pdf
shibuiwilliam
1
270
解消したはずが…技術と人間のエラーが交錯する恐怖体験
lamaglama39
0
190
LIFF CLIとngrokを使ったLIFF/LINEミニアプリのお手軽実機確認
diggymo
0
230
人に寄り添うAIエージェントとアーキテクチャ #BetAIDay
layerx
PRO
8
2k
Bet "Bet AI" - Accelerating Our AI Journey #BetAIDay
layerx
PRO
4
1.5k
Lambda management with ecspresso and Terraform
ijin
2
130
Featured
See All Featured
YesSQL, Process and Tooling at Scale
rocio
173
14k
Designing for Performance
lara
610
69k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.9k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
4 Signs Your Business is Dying
shpigford
184
22k
RailsConf 2023
tenderlove
30
1.2k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Testing 201, or: Great Expectations
jmmastey
45
7.6k
The Cost Of JavaScript in 2023
addyosmani
51
8.7k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
Into the Great Unknown - MozCon
thekraken
40
2k
Transcript
駭客看 DJANGO 2013/05/26 @ PyCon <
[email protected]
>
本場演講「四不一沒有」
四不一沒有 • 四不 – 我不是駭客 – 我不會寫 django – 不會有 django 新漏洞( 請洽七月台灣駭客年會
) – 這場演講不難,真的很簡單 • 沒有 – 這場演講沒有梗,有笑點的話拜託笑一下
About Me • 蔡政達 aka Orange • 2009 台灣駭客年會競賽 冠軍
• 2011, 2012 全國資安競賽 金盾獎冠軍 • 2011 東京 AVTOKYO 講師 • 2012 香港 VXRLConf 講師 • 台灣 PHPConf, WebConf 講 師 • 專精於 – 駭客攻擊手法 – Web Security – Windows Vulnerability Exploitation
About Me • CHROOT Security Group 成員 • NISRA 資訊安全研究會
成員 • Disclosed – Windows MS12-071(CVE-2012-4775) – Django (CVE-2013-0305) • Blog – http://blog.orange.tw/
2013 年 X 月 O 日 天氣晴,今天是寒假的第一天… 幹, Rails 爆遠端執行代碼漏洞欸
None
Django 會不會有同樣的問題呢? 學生什麼都沒有, 最多的就是時間。 來研究個 Open Source 專案很正常吧!
Vulnerabilities by Year Django
Vulnerabilities by Year Django 同樣情境跟 Rails 比較...
包含至少 8 個 Remote Code Execution
......
其實我今天是來推廣 Rails 開玩笑的啦我沒有要戰語言 T_T
Django 現有的保護機制 Django Security Overview
Security Overview • Built-in XSS protection • Built-in SQL Injection
protection – ORM ( Q Object ) • Built-in CSRF protection – django.middleware.csrf.CsrfViewMiddleware – Check REFERER header – Compare CSRF token
Security Overview • Clickjacking protection – django.middleware.clickjacking.XFrameOptionsMiddleware – Optional in settings.py – X-Frame-Options:
SAMEORIGIN
Security Overview • Password hashing is more and more stronger
– Default is PBKDF2 hasher – django.contrib.auth.hahsers – 10000 iterators makes attackers say fuck … $ time python pbkdf2.py mypassword real 0m0.401s user 0m0.260s sys 0m0.074s
攻擊手法 Some Attacking Vectors
Some Attacking Vectors • VERY VERY BASIC attacking way •
Weak admin password • Debug mode on – Leakage URL pattern – Leakage database password
Some Attacking Vectors • Cross-Site Scripting – HttpResponse( html ) – {{
output|safe }} – {% autoescape off %} • Bad HTML style is always vulnerable – <a href="{{ url }}"> # safe – <a href={{ url }}> # unsafe – <a href=xxx onload=alert(/xss/)>
Some Attacking Vectors • SQL Injection in Django ORM – raw(
sql ) is injectable – extra( select=…, where=… ) is also injectable • String concatenate and format string are vulnerable in any case
Some Attacking Vectors • Third-party module security • Py-bcrypt #
CVE-2013-1895 – Authentication bypass • Python Image Library # CVE-2012-3443 – Denied-of-Service • Python XML.sax # CVE-2013-1664 & 1665 – XXE & XEE Injection
XML eXternal Entity Injection Parsing XML Document Type Definition issue
<?xml encoding='utf-8' ?> <!DOCTYPE account[ <!ENTITY output SYSTEM '/etc/passwd'>]> <account> &output; </account>
XML Entity Expansion Injection <?xml encoding='utf-8' ?> <!DOCTYPE account[ <!ENTITY
a "ooo"> <!ENTITY b "&a; &a; &a; &a; &a;"> <!ENTITY c "&b; &b; &b; &b; &b;"> ... <!ENTITY z "&y; &y; &y; &y; &y;"> ]> <account> &z; </account>
Secret Key Leakage Issue (1/3) • Django SECRET_KEY use in
– get_random_string() using in csrf and hash generating – Django session_data encryption – Django signed cookie encryption – ……
Secret Key Leakage Issue (2/3) • Signed cookie store python
object using Pickle – > HTTP_COOKIE – > decode with secret_key – > pickle.loads( … )
Pickle & cPickle • A module that serializing and De-serializing
python objects • Execute command >>> import pickle >>> pickle.loads( "cos\nsystem\n(S'/bin/sh'\ntR." ) • You can observe by using pickletools >>> import pickletools >>> pickletools.dis( "cos\nsystem\n(S'/bin/sh'\ntR." )
Secret Key Leakage Issue (3/3) • Signed_cookie is encoded by
Pickle – > HTTP_COOKIE # malicious cookie – > decode with secret_key – > pickle.loads( … ) # code execution • Protect your SECRET_KEY ( ex .gitignore )
Conclusion • I think Django is a secure framework •
More and more wrapper make the attack difficult • People is always the most dangerous things
Reference • Django Weblog – https://www.djangoproject.com/weblog/ • Security in Django – https://docs.djangoproject.com/en/dev/topics/security/
• CVE Details – http://www.cvedetails.com/
Any Questions ? Whatever can be asked
Thanks. <
[email protected]
>