97, 1/5 ȸ¿ø°¡ÀÔ  ·Î±×ÀΠ 
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   º¯¼ö ¼±¾ð½Ã ½ºÅÿ¡¼­ÀÇ À§Ä¡

http://www.hackerschool.org/HS_Boards/zboard.php?id=QNA_Reversing&no=119 [º¹»ç]


char str[100];
char a = 'A';

printf("a = %c\n",a);
strcpy(str, argv[1]);
printf("a = %c\n",a);


BOF ¿¬½ÀÇÏ°íÀÖ´Â ÇÞº´¾Æ¸® ÀÔ´Ï´Ù.
ÀÌ·¸°Ô str[100]À» ¸ÕÀú ¼±¾ðÇÏ°í a¸¦ ¼±¾ðÇÏ¸é ½ºÅÿ¡¼­ aÀÇ À§Ä¡°¡ strÁÖ¼ÒºÁ ³·Àº °÷¿¡ À§Ä¡Çϴ°ɷΠ¾Ë°íÀÖ½À´Ï´Ù. FTZ ¼­¹ö¿¡¼­ ÇÁ·Î±×·¥ ¸¸µç ÈÄ gdb·Î µð½º¾î¼Àºí Çߴµ¥ º¯¼ö aÀÇ À§Ä¡°¡ [ebp - 121] ÀÌ°í strÀÇ ½ÃÀÛ ÁÖ¼Ò°¡ [ebp - 120]À¸·Î ³ª¿À´Âµ¥ ¿Ö ÀÌ·¸°Ô µÇ´Â°ÇÁö ¸ð¸£°Ú½À´Ï´Ù. ( ¸Þ¸ð¸® º¸È£±â¹ýÀº ´Ù ÇØÁ¦Çß½À´Ï´Ù. )

  Hit : 2061     Date : 2018/11/13 01:39



    
gihacker ½ºÅà ÀÚ¶ó´Â ¹æÇâ¿¡ ´ëÇؼ­ °í·ÁÇغ¸½Ã±â ¹Ù¶ø´Ï´Ù 2018/11/13  
turttle2s gihacker
¸ÕÀú ¼±¾ðÇÑ str¿¡ ´ëÇؼ­ °ø°£À» È®º¸ÇØ ÁÖ´Â°Í °°Àºµ¥.. Çò°¥¸®´Â°Ô ´Ù¸¥ ¼­¹ö¿¡¼­ ¶È°°Àº ¼Ò½º·Î ¶È°°ÀÌ ÄÄÆÄÀÏ Çߴµ¥ ¿©±â¼± º¯¼ö a¿¡ ´ëÇÑ ÀÚ¸®¸¦ ¸ÕÀú Áֳ׿ä. ( [rbp - 0x1] )

64ºñÆ®¿¡¼± ´Ù¸£°Ô ÀÛµ¿Çϳª¿ä?
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±ºÀÎ ¤¤ ¾ÆÅ°ÅØÃĶû ¹«°üÇÏ°Ô ÄÄÆÄÀÏ·¯ÀÇ Â÷ÀÌÀÏ°Ì´Ï´Ù. 2018/11/15  
turttle2s ¤¤ ±×·¸±º¿ä. °¨»çÇÕ´Ï´Ù 2018/11/15  
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