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1574, 7/79 |
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SmileBedge | |||||||
½©ÄÚµå ¼¼±×¸ÕÆ®¿À·ù;; | |||||||
http://www.hackerschool.org/HS_Boards/zboard.php?id=QNA_system&no=1509 [º¹»ç]
Hit : 3250 Date : 2011/07/29 10:21
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´¾´¾ | \00¶§¹®¿¡ ±×·±°Å ¾Æ´Ò±î¿ä \00ÀÌ »ó´çÈ÷ ¸¹ÀÌ µé¾î°¡³×¿ä | 2011/07/29 | |
W.H. | \x00 ÀÌ ½©Äڵ忡 ÀÖÀ¸¸é Á¦´ë·Î ½ÇÇà ¾ÊµÇ¿ä | 2011/07/30 | |
pwn3r | ¤¤ NULLÀÌ ÇÊ¿äÇÑÄڵ忡 NULLÀ» ¾ø¾Ö¸é ½ÇÇàÀÚü°¡ ¾ÈµÇ¿ä ~ µð½º¾î¼ÀºíÇغ¸´Ï Hello World¸¦ Ãâ·ÂÇϽ÷Á´ø°Å°°À¸½Åµ¥ FTZ±âÁØÀ¸·Î ù¹ø° ½©ÄÚµåÀÇ ½ÃÀۺκÐÀÌ ÀÌ»óÇϳ׿ä 0x08049440 <code+0>: call 0x8049422 <data_start+2> // ¿ä±âÀÌ»ó 0x08049445 <code+5>: dec %eax // "Hello World" 0x08049446 <code+6>: gs // "Hello World" 0x08049447 <code+7>: insb (%dx),%es:(%edi)// "Hello World" 0x08049448 <code+8>: insb (%dx),%es:(%edi)// "Hello World" 0x08049449 <code+9>: outsl %ds:(%esi),(%dx)// "Hello World" 0x0804944a <code+10>: and %dl,0x6f(%edi)// "Hello World" 0x0804944d <code+13>: jb 0x80494bb <_DYNAMIC+67>// "Hello World" 0x0804944f <code+15>: add %dl,%fs:0x56e58955(%eax)// "Hello World" 0x08049456 <code+22>: mov $0xb,%edx // 11±ÛÀÚ 0x0804945b <code+27>: pop %ecx // "Hello World" »Ì¾Æ³»±â 0x0804945c <code+28>: mov $0x1,%ebx // stdout 0x08049461 <code+33>: mov $0x4,%eax // write 0x08049466 <code+38>: int $0x80 // 0x80 inturrupt 0x08049468 <code+40>: mov $0x1,%eax // exit 0x0804946d <code+45>: mov $0x0,%ebx // 0 0x08049472 <code+50>: int $0x80 // 0x80 inturrupt µð½º¾î¼ÀºíÇÑ ÄÚµåÁß code+0ºÎºÐÀÇ ¹ÙÀÌÆ®Äڵ尡 \xe8\xdd\xff\xff\xffÀε¥ , code+5¿Í code+22ÀÇ offsetÀº 0x11ÀÌ¿¡¿ä. (code + 5 ~ code + 21Àº "Hello World") ±×·¡¼ \xe8\x11\x00\x00\x00 ·Î ¹Ù²ãÁֽøé Àߵ˴ϴ٠:) ÀÎÁõ¼¦ [guest@ftz guest]$ cat pwn3r.c http://www.hackerschool.org/HS_Boards/skin/guta_green/cw_write.gif char code2[] = "\xe8\x11\x00\x00\x00\x48\x65\x6c\x6c\x6f\x20\x57\x6f\x72\x6c\x64\x00\x90\x55\x89\xe5\x56" "\xba\x0b\x00\x00\x00\x59\xbb\x01\x00\x00\x00\xb8\x04\x00\x00\x00\xcd\x80\xb8\x01\x00\x00\x00\xbb\x00\x00\x00\x00\xcd\x80"; int main() { int *run; run = (int *)&run+2; (*run) = (int) code2; return 0; } [guest@ftz guest]$ ./pwn3r Hello World[guest@ftz guest]$ |
2011/07/30 | |
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