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Overflow
1.
Overflow 2015.4.22 이경준 1
2.
들어가기전 용어정리 쉘코드(익스플로잇코드)
스택 Stroul(String to unsigned long) Overflow Buffer Overflow Integer Overflow 2
3.
Buffer Overflow ESP EBP RET BUFFER ESP BUFFER 3
4.
Integer Overflow Int의
범위 - -21,4748,3648 ~ 21,4748,3647 Hex 0x8000,0000 = -21,4748,3648 -21,4748,3648 - 1 = 21,4748,3647 21,4748,3647 + 1 = -21,4748,3648 4
5.
일반적인 코드5
6.
Integer Overflow -21,4748,3648
* 20 = ? -21,4748,3647 * 20 = 20 -21,4748,3646 * 20 = 40 -21,4748,2647 *20 = 20020 0 6
7.
Buffer Overflow ESP EBP RET BUFFER ESP NOP +
shellcode Everywhere NOP 7
8.
Protection Memcpy, strcpy
-> X Strncpy -> O Boundary 검사 좀더 정확히 사용자의 input은 절대 신뢰 X 8
9.
Q&A9
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