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1574, 72/79 |
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blacksheep | |||||||
egghunter °ü·Ã bof¹®Á¦¿¡´ëÇØ Áú¹®ÀÔ´Ï´Ù | |||||||
http://www.hackerschool.org/HS_Boards/zboard.php?id=QNA_system&no=1096 [º¹»ç]
Hit : 3695 Date : 2009/05/22 12:59
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jwkzzangs | Á¦°¡ ºÎÁ·ÇÑ Áö½ÄÀ¸·Î ¾Ë¾ÆºÃ´Âµ¥¿ä;;; rtl(return- to-libc, return-into-libc) ¹æ¹ýÀ̶ó°í ÇÕ´Ï´Ù... ±× ¹æ¹ýÀ» ±ú±â À§Çؼ´Â ±âÁ¸ÀÇ bofó·³ ½©Äڵ带 ¿Ã·Á³õ°í ±× ½©Äڵ带 °¡¸®Å³¼ö°¡ ¾ø½À´Ï´Ù.. ´ç¿¬È÷ ·£´ý½ºÅÃÀ̹ǷΠesp°ªÀÌ ¸¾´ë·Î º¯ÇϹǷΠ½ÅÀÌ ¾Æ´ÑÀÌ»ó ¸ÂÃ߱Ⱑ ÈûµéÁÒ;;; ±×·¡¼ ¹æ¹ýÀº ±âº»ÀûÀ¸·Î ¸®´ª½ºÈ¯°æ¿¡¼ ÀÚÁÖ »ç¿ëÇÏ´Â ÇÔ¼ö(system, execv)°°Àº°Ô libc¶ó´Â °÷¿¡ ¿Ã¶ó¿Â´Ù°í ÇÕ´Ï´Ù.. ±×·¡¼ ¸®ÅÏ ÁÖ¼Ò¸¦ libcÀÇ ÇÔ¼öÀÇ Ã³À½ ÁÖ¼Ò+2(±âÁ¸ ½ºÅÃÀ» ±×´ë·Î »ç¿ëÇϱâ À§Çؼ)·Î ¹Ù²ãÁÝ´Ï´Ù. ±×ÈÄ¿¡ ÇÔ¼öÀÇ ÀμöÀÇ °Å¸®¸¦ ¾Ë¾Æ³½ÈÄ ½ºÅÃ»ó¿¡ /bin/sh¶ó°í Àû¾îÁشٰí ÇÕ´Ï´Ù.. ±×·±µ¥ ÀÌ·¸°Ô Çصµ ¿äÁò fedora10°°Àº ÃֽŹöÀü¿¡¼´Â ¾ÈµÈ´Ù°í ÇÕ´Ï´Ù.. ±×·¡¼ ³ª¿Â°Ô elf¾È¿¡ÀÖ´Â GOT(Global Offset Table)À» »ç¿ëÇؼ ÇÑ´Ù°í ÇÕ´Ï´Ù. ÀÌ°É »ç¿ëÇÏ´Â ÀÌÀ¯´Â ÀÌ°Ç ·£´ý½ºÅà »ó¿¡¼µµ º¯ÇÏÁö ¾Ê´Â´Ù°í ÇÕ´Ï´Ù.. ~°Å¸®¸¸Å ¶³¾îÁø°÷À¸·Î ¶ó´Â°Ô ¹º°¡ º¯ÇÏÁö ¾Ê´Â °ªÀÌ ÀÖ¾î¾ß Çϴϱî¿ä;;; |
2009/05/22 | |
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