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FreeBSD-SA-96:02                                            Security Advisory
                                                                FreeBSD, Inc.

Topic:          apache httpd meta-character escaping

Category:       port
Module:         apache
Announced:      1996-04-22
Affects:        FreeBSD 2.0.5 and 2.1.0 ports/packages distributions
                with apache http daemon installed an enabled
Corrected:      1996-04-21 ports source code
Source:         Generic apache distribution bug
FreeBSD only:   no

Reference:      CERT Advisory CA-96.06.cgi_example_code
                (warning: CERT's advisory is incomplete)

Patches:        no patches available, see below for update

=============================================================================

I.   Background    

     A bug was found in the apache daemon that may allow remote
     users to obtain unauthorized access to a machine running
     apache httpd.


II.  Problem Description

     Versions of the apache http daemon before release 1.05 do
     not properly restrict shell meta-characters transmitted to
     the daemon via form input (via GET or POST).


III. Impact

     The problem could allow remote users to gain unauthorized access
     to a system.  This problem is only exploitable on systems where
     the apache http daemon has been installed and is enabled.

     The apache http daemon is not installed or enabled by default
     but is a common package that many FreeBSD users may have chosen
     to install.

IV. Solution(s)

     The Apache Group released version 1.05 of the daemon which fixes
     this vulnerability.  The FreeBSD Project updated the ports and
     packages system to use this new daemon.

     Interested parties may obtain an updated pre-compiled FreeBSD
     package from:

     ftp://ftp.freebsd.org/pub/FreeBSD/packages-current/www/apache-1.0.5.tgz

     and an updated "automatic port" from the directory hierarchy:

     ftp://ftp.freebsd.org/pub/FreeBSD/ports-current/www/apache.tar.gz

V. Workaround

     This vulnerability can only be eliminated by updating to a more recent
     version of apache or by disabling apache httpd.


=============================================================================
FreeBSD, Inc.

Web Site:                       http://www.freebsd.org/
Confidential contacts:          security-officer@freebsd.org
PGP Key:                        ftp://freebsd.org/pub/CERT/public_key.asc
Security notifications:         security-notifications@freebsd.org
Security public discussion:     security@freebsd.org

Notice: Any patches in this document may not apply cleanly due to
        modifications caused by digital signature or mailer software.
        Please reference the URL listed at the top of this document
        for original copies of all patches if necessary.
=============================================================================

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