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FreeBSD Security Advisory: Module: gnapster

May 10, 2000, 19:38 (0 Talkback[s])


Desktop-as-a-Service Designed for Any Cloud ? Nutanix Frame

Date: Tue, 9 May 2000 12:24:03 -0700
From: FreeBSD Security Officer security-officer@freebsd.org
Subject: FreeBSD Security Advisory: FreeBSD-SA-00:18.gnapster

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:


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

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


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: