Gentoo: lighttpd Script source disclosure
Posted by Benjamin D. Thomas   
Gentoo An attacker can trick lighttpd into revealing the source of scripts that should be executed as CGI or FastCGI applications.
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Gentoo Linux Security Advisory                           GLSA 200502-21
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                                            http://security.gentoo.org/
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  Severity: Low
     Title: lighttpd: Script source disclosure
      Date: February 15, 2005
      Bugs: #81776
        ID: 200502-21

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Synopsis
========

An attacker can trick lighttpd into revealing the source of scripts
that should be executed as CGI or FastCGI applications.

Background
==========

lighttpd is a small-footprint, fast, compliant and very flexible
web-server which is optimized for high-performance environments.

Affected packages
=================

    -------------------------------------------------------------------
     Package               /   Vulnerable   /               Unaffected
    -------------------------------------------------------------------
  1  www-servers/lighttpd      < 1.3.10-r1                >= 1.3.10-r1

Description
===========

lighttpd uses file extensions to determine which elements are programs
that should be executed and which are static pages that should be sent
as-is. By appending %00 to the filename, you can evade the extension
detection mechanism while still accessing the file.

Impact
======

A remote attacker could send specific queries and access the source of
scripts that should have been executed as CGI or FastCGI applications.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All lighttpd users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-servers/lighttpd-1.3.10-r1"

References
==========

  [ 1 ] lighttpd-announce Advisory
        http://article.gmane.org/gmane.comp.web.lighttpd/1171

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200502-21.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0