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Sänt: 2002-05-02 23:50
Ärende: [RHSA-2002:064-12] Updated Nautilus for symlink vulnerability writing metadata files
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Red Hat, Inc. Red Hat Security Advisory
Synopsis: Updated Nautilus for symlink vulnerability writing metadata files
Advisory ID: RHSA-2002:064-12
Issue date: 2002-04-16
Updated on: 2002-04-30
Product: Red Hat Linux
Keywords: nautilus metadata symlink
Cross references:
Obsoletes:
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1. Topic:
The Nautilus file manager in Red Hat Linux 7.2 has a symlink
vulnerability.
2. Relevant releases/architectures:
Red Hat Linux 7.2 - i386, ia64, s390
3. Problem description:
The Nautilus file manager (used by default in the GNOME desktop
environment) writes metadata files containing information about files
and directories that have been visited in the file manager. The
metadata file code in Red Hat Linux 7.2 can be tricked into chasing a
symlink and overwriting the symlink target.
The errata packages repair this problem in two ways. First they
create metadata files using mkstemp() and then renaming the files,
instead of creating the files in-place with a fixed filename. This
patch in the errata packages was backported from the latest upstream
version of Nautilus on cvs.gnome.org.
Second, Nautilus used to have a preference to store metadata only in
the user's home directory, rather than in each directory being
browsed. This errata removes the preference and hardcodes its value
to always use the home directory. This disables the shared-metadata
functionality, so if two users browse the same directory they may see
different icons, emblems, and so forth.
Nautilus has only been shipped in Red Hat Linux 7.2; earlier
versions do not contain Nautilus and thus are not vulnerable.
This problem should only be exploitable locally (filesystem access
is needed to create a malicious symlink). If Nautilus is not run
as root, the impact should be limited to overwriting files that
unprivileged users have access to. If Nautilus is run as root,
a malicious symlink could overwrite system-critical files such
as /etc/passwd with Nautilus metadata.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0157 to this issue. The BUGTRAQ ID for this
issue is 4373.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list of the RPMs you wish to upgrade. Only
those RPMs which are currently installed will be updated. Those RPMs
which are not installed but included in the list will not be updated.
Note that you can also use wildcards (*.rpm) if your current
directory *only* contains the desired RPMs.
Please note that this update is also available via Red Hat Network.
Many people find this an easier way to apply updates. To use Red Hat
Network, launch the Red Hat Update Agent with the following command:
up2date
This will start an interactive process that will result in the
appropriate RPMs being upgraded on your system.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
6. RPMs required:
Red Hat Linux 7.2:
SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/nautilus-1.0.4-46.src.rpm
i386:
ftp://updates.redhat.com/7.2/en/os/i386/nautilus-1.0.4-46.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/nautilus-devel-1.0.4-46.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/nautilus-mozilla-1.0.4-46.i386.rpm
ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/nautilus-1.0.4-46.ia64.rpm
ftp://updates.redhat.com/7.2/en/os/ia64/nautilus-devel-1.0.4-46.ia64.rpm
7. Verification:
MD5 sum Package Name
--------------------------------------------------------------------------
df668f91e33ecf794aa10eee7e236f80 7.2/en/os/SRPMS/nautilus-1.0.4-46.src.rpm
f91c1cb8fb30034c8ea8aefa184c5589 7.2/en/os/i386/nautilus-1.0.4-46.i386.rpm
af4c6accb8c0e4ec60921e0938ad925d 7.2/en/os/i386/nautilus-devel-1.0.4-46.i386.rpm
84ffe4f70577e6d235086a8a7cd86a4d 7.2/en/os/i386/nautilus-mozilla-1.0.4-46.i386.rpm
be8f595a061435b13675d9c799377f33 7.2/en/os/ia64/nautilus-1.0.4-46.ia64.rpm
6528cdff10addff8d09e8f0d8e13a49e 7.2/en/os/ia64/nautilus-devel-1.0.4-46.ia64.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
http://www.redhat.com/about/contact/pgpkey.html
You can verify each package with the following command:
rpm --checksig <filename>
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
rpm --checksig --nogpg <filename>
8. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0157
Copyright(c) 2000, 2001, 2002 Red Hat, Inc.
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