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

Binary Exploitation - Basic 補充篇

Avatar for LJP-TW LJP-TW
May 26, 2021
Technology
66
1

Binary Exploitation - Basic 補充篇

2021/05/26 台科資安社 社課
直播記錄檔: https://www.youtube.com/watch?v=I3X69ADZOnw
- TLS

Avatar for LJP-TW

LJP-TW

May 26, 2021

More Decks by LJP-TW

See All by LJP-TW
Reverse Engineering - 1
Avatar for LJP-TW ljptw
0
1.8k
Reverse Engineering - 2
Avatar for LJP-TW ljptw
0
810
Reverse Engineering - 3
Avatar for LJP-TW ljptw
0
660
Re:0 從零開始的逆向工程
Avatar for LJP-TW ljptw
1
1.3k
Linux 極入門篇
Avatar for LJP-TW ljptw
1
330
Fuzzing 101
Avatar for LJP-TW ljptw
1
260
Binary Exploitation - File Structure
Avatar for LJP-TW ljptw
1
340
Binary Exploitation - Heap
Avatar for LJP-TW ljptw
1
210
Binary Exploitation - Basic
Avatar for LJP-TW ljptw
1
160

Other Decks in Technology

See All in Technology
攻撃と防御で学ぶAI時代のプロダクトセキュリティ演習
Avatar for Recruit recruitengineers
PRO
9
2.8k
猫付きpingコマンドを自作
Avatar for uyuki uyuki234
0
240
Digitization部 紹介資料
Avatar for Sansan, Inc. sansan33
PRO
2
7.7k
Sansan Engineering Unit 紹介資料
Avatar for Sansan, Inc. sansan33
PRO
1
4.9k
QAエンジニア起点で進める、SmartHRにおける信頼性向上について
Avatar for kaomi kaomi_wombat
1
140
MIRU 2026 チュートリアル
Avatar for Keisuke Fujii keisuke198619
0
910
【CEDEC2026】コードレビュー支援ツール開発から学ぶ：LLMを用いた業務システムの実践的な運用設計と誤出力対策
Avatar for Cygames, Inc. cygames
PRO
0
790
Software Supply Chain Attackからクラウド環境を守るためにできること
Avatar for LHazy lhazy
2
260
[ChatGPT Work LT]事務作業が苦手な人のための バックオフィスの「半」自動化
Avatar for chimaki chimaki_iot
0
290
Service Connect 上のサービスに ECS Service の外側から到達できなかった話
Avatar for Itaru Ota ota1022
1
250
【Google Cloud Next Tokyo'26】Gemini Enterprise と Oracle AI Database で実現する、 業務データ活用を実現する AI エージェント実装
Avatar for KoheiOgawa shisyu_gaku
0
250
クラウドセキュリティ入門　～安全なクラウド利用のための基礎知識～
Avatar for LHazy lhazy
13
13k

Featured

See All Featured
Skip the Path - Find Your Career Trail
Avatar for Mark Kilby mkilby
1
180
Rebuilding a faster, lazier Slack
Avatar for samanthasiow samanthasiow
85
9.6k
Technical Leadership for Architectural Decision Making
Avatar for Kenny Baas-Schwegler baasie
3
480
End of SEO as We Know It (SMX Advanced Version)
Avatar for Michael King ipullrank
3
4.4k
Fireside Chat
Avatar for paigeccino paigeccino
42
4k
Documentation Writing (for coders)
Avatar for Carmen Chung carmenintech
77
5.4k
We Have a Design System, Now What?
Avatar for Morgane Peng morganepeng
55
8.3k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
Avatar for Dan Newman danielanewman
230
23k
Save Time (by Creating Custom Rails Generators)
Avatar for Garrett Dimon garrettdimon
PRO
32
4.3k
Stop Working from a Prison Cell
Avatar for Chris Michel hatefulcrawdad
274
21k
GitHub's CSS Performance
Avatar for Jon Rohan jonrohan
1033
470k
Visualization
Avatar for Eitan Lees eitanlees
152
17k

Transcript

  1. 2021/5/26 NTUSTISC Binary Exploitation aka Pwn Basic 補充篇

  2. # whoami - LJP / LJP-TW - Pwn / Rev

    - NTUST / NCTU / NYCU - 10sec CTF Team 1

  3. Outline - TLS 2

  4. TLS 3

  5. TLS - TLS 全名 Thread-Local Storage - Linux x64 使用

    fs 暫存器記著 TLS 的位置 - Stack Canary 就是存在 TLS 中 4

  6. TLS - fs 為 Segment Register - 計算方式 reg:offset =

    ref + offset - 這時候你用 gdb 想看一下 fs 等於多少卻發現 - 難道 Canary 從 [0+0x28] 拿來的?? 5

  7. TLS - GDB 也是 Process, fs = 0 是指 GDB

    自己的 fs - 所以要怎麼拿到觀測中的 Process 的 fs? - 呼叫 arch_prctl 6 Ref: https://fasterthanli.me/series/making-our-own-executable-packer/part-13

  8. TLS - Pwngdb 有實作取得 TLS 的功能 - 閱讀一下怎麼實作的, 發現其實一樣 -

    https://github.com/scwuaptx/Pwngdb/blob/master/pwndbg/pwngdb.py#L77 7

  9. TLS Demo 8