gnapster port allows remote users to view local files

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              AUSCERT External Security Bulletin Redistribution
                             
                      ESB-2000.092 -- FreeBSD-SA-00:18
            gnapster port allows remote users to view local files
                                 12 May 2000

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	AusCERT Security Bulletin Summary
	---------------------------------

Product:		gnapster
Vendor:			FreeBSD
Operating System:	FreeBSD
			Unix
Platform:		N/A

Impact:			Access Privileged Data
Access Required:	Remote


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FreeBSD-SA-00:18                                           Security Advisory
                                                                FreeBSD, Inc.

Topic:		gnapster port allows remote users to view local files

Category:       ports
Module:         gnapster
Announced:      2000-05-09
Credits:	Fixed by vendor.
Affects:        Ports collection.
Corrected:      2000-04-29
Vendor status:	Updated version released.
FreeBSD only:   NO

I.   Background

Gnapster is a client for the Napster file-sharing network.

II.  Problem Description

The gnapster port (version 1.3.8 and earlier) contains a vulnerability
which allows remote gnapster users to view any file on the local
system which is accessible to the user running gnapster. Gnapster does
not run with elevated privileges, so it is only the user's regular
filesystem access permissions which are involved.

The gnapster 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 3200 third-party applications in a ready-to-install
format. The ports collection shipped with FreeBSD 4.0 contains this
problem since it was discovered after the release.

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 can view files accessible to the user running the
gnapster client.

If you have not chosen to install the gnapster port/package, then your
system is not vulnerable to this problem.

IV.  Workaround

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

V.   Solution

One of the following:

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

2) Reinstall a new package dated after the correction date, obtained from:

ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/audio/gnapster-1.3.9.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/audio/gnapster-1.3.9.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/audio/gnapster-1.3.9.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/audio/gnapster-1.3.9.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/audio/gnapster-1.3.9.tgz

Note: it may be several days before the updated packages are available.

3) download a new port skeleton for the gnapster 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:

ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/devel/portcheckout-1.0.tgz

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