[NEWS] Mephistoles HTTPd Cross Site Scripting Vulnerability

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To: list@securiteam.com
Date: 22 Jan 2004 16:54:16 +0200

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  Mephistoles HTTPd Cross Site Scripting Vulnerability
------------------------------------------------------------------------

SUMMARY

"The <http://sourceforge.net/projects/mephistoles> Mephistoles Internet
Suite includes at present an HTTP server, an FTP server, a DNS caching
server, an experimental and yet unusable NetBIOS client and a client that
can (currently) fetch pages via HTTP. All programs were written in PERL
and are compact."

The HTTP server that is distributed in this Internet Suite is vulnerable
to a cross site scripting attack.

DETAILS

Vulnerable Systems:
 * Mephistoles HTTPd version 0.6.0 final

The HTTPd program does not perform filtering on the input strings sent by
the client and in fact the strings will appear in the returned page.

A simple way to test this vulnerability:

http://[host]/< A_SCRIPT>

Example:

http://[host]/< script>alert("Test")< /script>

Vendor Status:
The vendor has been contacted and a new release of Mephistoles HTTPd is in
the making.

Patch Availability:
In the meantime, a small patch by Donato can be applied that fixes the
issue in version 0.6.0 final.

--- mephistoles-httpd-0.6.0final-noarch.pl 2004-01-21 12:16:34.000000000
+0100
+++ patch.pl 2004-01-21 12:25:56.000000000 +0100
@@ -205,7 +205,7 @@
 my $ic;

 if (opendir(DIR,$trdr.$public)) { } else {
- serr(404,$page);
+ serr(404,"");
 return;
 }

@@ -389,13 +389,13 @@
 $page=conv($page); # convert $page from %XX-encoding to plain ASCII

 if (evilhacker($page)) { # illegal filename
- serr(403,$page);
+ serr(403,"");
 return;
 }

 if (($cgiholes==1) && (defined $getstr)) { # minimal protection for bad
cgi-scripts!
 if (evilhacker($getstr)) {
- serr(403,$page);
+ serr(403,"");
  return;
 }
 }
@@ -411,7 +411,7 @@
   $trdr="/root/public_html/";
   $trp=$2;
  } else {
- serr(403,$page);
+ serr(403,"");
  }
  } else {
  $page =~ /^\/\~(.+?)\/(.*?)$/g;
@@ -449,11 +449,11 @@
 if ($reqt==2) { # POST-requests
 $ENV{"REQUEST_METHOD"}="POST";
 if ($postreq==0) {
- serr(403,"$page");
+ serr(403,"");
 } else {
  if ($postreq==1) {
  if (iscgi($trp)) {
- serr(403,"$page");
+ serr(403,"");
   return;
  }
  }
@@ -495,7 +495,7 @@
 $ENV{"REQUEST_METHOD"}="GET";

 if (!(-e $trdr.$trp)) {
- serr(404,$page);
+ serr(404,"");
  return;
 }

@@ -550,7 +550,7 @@
 }
 close(SRC);
 } else {
- serr(404,$page);
+ serr(404,"");
 }

}

ADDITIONAL INFORMATION

The information has been provided by <mailto:donato@autistici.org> Donato
Ferrante

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