full-disclosure - [ GLSA 200407-10 ] rsync: Directory traversal in rsync daemon

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Message-ID: <20040712135129.GK18023@mail.lieber.org>
From: klieber at gentoo.org (Kurt Lieber)
Subject: [ GLSA 200407-10 ] rsync: Directory traversal in rsync daemon

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Gentoo Linux Security Advisory                           GLSA 200407-10
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: rsync: Directory traversal in rsync daemon
      Date: July 12, 2004
      Bugs: #49534
        ID: 200407-10

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Synopsis
========

Under specific conditions, the rsync daemon is vulnerable to a
directory traversal allowing to write files outside a sync module.

Background
==========

rsync is a utility that provides fast incremental file transfers. It is
used to efficiently synchronize files between hosts and is used by
emerge to fetch Gentoo's Portage tree. rsyncd is the rsync daemon,
which listens to connections from rsync clients.

Affected packages
=================

    -------------------------------------------------------------------
     Package         /   Vulnerable   /                     Unaffected
    -------------------------------------------------------------------
  1  net-misc/rsync      <= 2.6.0-r1                       >= 2.6.0-r2

Description
===========

When rsyncd is used without chroot ("use chroot = false" in the
rsyncd.conf file), the paths sent by the client are not checked
thoroughly enough. If rsyncd is used with read-write permissions ("read
only = false"), this vulnerability can be used to write files anywhere
with the rights of the rsyncd daemon. With default Gentoo
installations, rsyncd runs in a chroot, without write permissions and
with the rights of the "nobody" user.

Impact
======

On affected configurations and if the rsync daemon runs under a
privileged user, a remote client can exploit this vulnerability to
completely compromise the host.

Workaround
==========

You should never set the rsync daemon to run with "use chroot = false".
If for some reason you have to run rsyncd without a chroot, then you
should not set "read only = false".

Resolution
==========

All users should update to the latest version of the rsync package.

    # emerge sync

    # emerge -pv ">=net-misc/rsync-2.6.0-r2"
    # emerge ">=net-misc/rsync-2.6.0-r2"

References
==========

  [ 1 ] CAN-2004-0426
        http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0426

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

    http://security.gentoo.org/glsa/glsa-200407-10.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0
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