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FreeBSD-SA-00:73                                           Security Advisory

                                                                FreeBSD, Inc.



Topic:          thttpd allows remote reading of local files



Category:       ports

Module:         thttpd

Announced:      2000-11-20

Credits:        ghandi@MINDLESS.COM

Affects:        Ports collection prior to the correction date.

Corrected:      2000-10-30

Vendor status:  Updated version released

FreeBSD only:   NO



I.   Background



thttpd is a simple, small, fast HTTP server.



II.  Problem Description



The thttpd port, versions prior to 2.20, allows remote viewing of

arbitrary files on the local server.  The 'ssi' cgi script does not

correctly restrict URL-encoded requests containing ".." in the path.

In addition, the cgi script does not have the same restrictions as the

web server for preventing requests outside of the web root.  These two

flaws allow remote users to access any file on the system accessible

to the web server user (user 'nobody' in the default configuration).



The thttpd port is not installed by default, nor is it "part of

FreeBSD" as such: it is part of the FreeBSD ports collection, which

contains over 4100 third-party applications in a ready-to-install

format.  The ports collections shipped with FreeBSD 3.5.1 and 4.1.1

contain this problem since it was discovered after the releases, but

it was corrected prior to the release of FreeBSD 4.2.



FreeBSD makes no claim about the security of these third-party

applications, although an effort is underway to provide a security

audit of the most security-critical ports.



III. Impact



Remote users may access any file on the system accessible to the web

server user (user 'nobody' in the default installation).



If you have not chosen to install the thttpd port/package, then your

system is not vulnerable to this problem.



IV.  Workaround



Deinstall the thttpd port/package, if you you have installed it.



V.   Solution



One of the following:



1) Upgrade your entire ports collection and rebuild the thttpd port.



2) Deinstall the old package and install a new package dated after the

correction date, obtained from:



http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/www/thttpd-2.20b.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/www/thttpd-2.20b.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/www/thttpd-2.20b.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/www/thttpd-2.20b.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/www/thttpd-2.20b.tgz



3) download a new port skeleton for the thttpd port from:



http://www.freebsd.org/ports/



and use it to rebuild the port.



4) Use the portcheckout utility to automate option (3) above. The

portcheckout port is available in /usr/ports/devel/portcheckout or the

package can be obtained from:



http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz

http://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz



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