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
Pwn勉強会
Search
m412u
November 27, 2018
Programming
8
12k
Pwn勉強会
・学内で開催したPwn入門勉強会で使用したスライドです。
m412u
November 27, 2018
Tweet
Share
More Decks by m412u
See All by m412u
slide.pdf
m412u
5
2.8k
学内Pwn勉強会
m412u
4
4.9k
Other Decks in Programming
See All in Programming
Building, Deploying, and Monitoring Ruby Web Applications with Falcon (Kaigi on Rails 2025)
ioquatix
4
1.8k
Flutterで分数(Fraction)を表示する方法
koukimiura
0
120
Le côté obscur des IA génératives
pascallemerrer
0
140
株式会社 Sun terras カンパニーデック
sunterras
0
260
CSC305 Lecture 05
javiergs
PRO
0
210
エンジニアとして高みを目指す、 利益を生み出す設計の考え方 / design-for-profit
minodriven
24
12k
クラシルを支える技術と組織
rakutek
0
200
Django Ninja による API 開発効率化とリプレースの実践
kashewnuts
0
1.2k
オープンソースソフトウェアへの解像度🔬
utam0k
11
2.4k
『毎日の移動』を支えるGoバックエンド内製開発
yutautsugi
2
230
NixOS + Kubernetesで構築する自宅サーバーのすべて
ichi_h3
0
480
チームの境界をブチ抜いていけ
tokai235
0
150
Featured
See All Featured
Making the Leap to Tech Lead
cromwellryan
135
9.6k
Large-scale JavaScript Application Architecture
addyosmani
514
110k
Site-Speed That Sticks
csswizardry
11
890
Measuring & Analyzing Core Web Vitals
bluesmoon
9
620
Agile that works and the tools we love
rasmusluckow
331
21k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3.1k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.5k
Fantastic passwords and where to find them - at NoRuKo
philnash
52
3.4k
Git: the NoSQL Database
bkeepers
PRO
431
66k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
Rails Girls Zürich Keynote
gr2m
95
14k
Reflections from 52 weeks, 52 projects
jeffersonlam
352
21k
Transcript
• 2 2 2 •
• P • 1 1 3 • • F
C 3 E C T
• ( ) ) 4 • 4 )
6 . .
. . 7
8 . .
9 .
0 . 1 0
• fi 2 n g l l h
b3a 1 • ( ./. h 2 • ) • a
• bCFE • iah • T h
• ce L • • • iaf • /0 S ) ( 8 0 2 81 1 . 2 1:
• 8 • 3 1 6 •
4 1
• PU U C U • ( () •
1 PU U • • C C 5
6 1
• s p C • e • c 36
36 ( 2.7 207 217 2 7 254 2 4 253 213 a 9 i8d b 7) P U 4
) ( • CDE • ) • ) S •
)( G E P • ) D • ) G Eeb eb • )( G Eeb eb • ) X DEFBI L D • ) X DEFBI L D • A E • ) 8 D • ) CDE • ) i ) 134 1 42
• 8 57 • 4 1 32 Ø 06
57 • 9 • Ø 06 57 • 9 •
• 2 0 • 2
• 21 • mov eax, 0x0 mov DWORD
PTR [ebp-0x10], eax
( ) • A • 2 A cmp eax, 0x1
cmp DWORD PTR [ebp-0x10], eax
) ( • 3 C 3 2 • jmp 0x08048574
je 0x08048574
( , ) • ))) 4 • ))) 2 4
2 2 ( call printf@plt ret
, ( ) , • • add
eax, edx sub eax, edx
(( ) • lea
ecx, [esp+0x4] lea eax, [ebp-0x18]
( () ( • s • n O P e
• \ • O N 7 d s 7 7 2 • l 79 20 •
( ) • c b 2 • 82 • •
a • a • b c • a
• B : • B P 9 • 12
12 2 • I SL 9 : O • B FH : : EH • B FH : U: EH
•
• U 4 • 1 C 7
4 • I • +
• ) 2 .8 (( 4 2 1
3 ) $ git clone https://github.com/m412u/pwn_study.git $ cd pwn_study/sample
• 9) 4 ( •
• •
$ objdump –d –M intel func
) ( : 5 : 5 : 1
• 2 • 1 • $ gdb –q ./func
d g b 5
• 3 52 2 2
• 2 3 52 gdb-peda$ break *0x08048535 or gdb-peda$ b *0x08048535
gdb-peda$ run or gdb-peda$ r
1 . 2 53 .
• 6 1 • •
6 1 • 5 gdb-peda$ nexti or gdb-peda$ ni gdb-peda$ stepi or gdb-peda$ si
+ mov edx, DWORD PTR [ebp-0x14] 5 3 704 704
+ mov eax, DWORD PTR [ebp-0x18] 0 3 4
+ sub esp, 0x8 4 3 0 5
+ push edx 423 0 56
+ 2 2 2 2 2 2 push eax 534
10 6 6
+ 2 2 2 333 2 2 211110 211110 call
0x080484bb <add> AB AB D 4 8 4 8 5C6
22220 888 22220 22220 push ebp EI EI 4653 B
D AC 1 4
22220 22220 22220 mov ebp, esp CD CD 346 8B
A E 1 5
55553 (0 )0 0 0 ) 55553 55553 ) sub
esp, 0x10 I I P A8 C 426 AB 133 AB D 8E
22220 22220 22220 mov edx, DWORD PTR [ebp+0x8] CD CD
8B A E 1 5 346
833331 8 8 8 8 8 833331 833331 mov eax,
DWORD PTR [ebp+0xc] DE DE A C B 206 I457
+ 533331 5 5 5 5 5 533331 533331 add
eax, edx AB AB E 11 6 CD 8204
8 833331 8 8 8 8 8 833331 833331 mov
DWORD PTR [ebp-0x4], eax DE DE A 9C B 206 I45
7 722220 7 7 7 7 7 722220 722220 mov
eax, DWORD PTR [ebp-0x4] CD CD 8B A E 1 5 34
+ 4 422220 4 4 4 4 4 422220 422220
leave = D mov esp, ebp E pop ebp A A D 5 BC 871 3
+ 7 744442 7 7 7 888 7 7 744442
744442 1 leave = mov esp, ebp pop ebp P P E IC D S A 30 5 S 30 B 22 B
44442 44442 44442 1 ret I X E 308 I
A A IB P I C 57S B D
+ 2 2 2 555 2 2 211110 211110 add
esp, 0x10 I C E 3 X7A 00P 8S 4 8 E DB
gdb-peda$ quit or gdb-peda$ q