[ GLSA 200611-05 ] Netkit FTP Server: Privilege escalation

[Raphael Marichez <falco () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200611-05
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Netkit FTP Server: Privilege escalation
      Date: November 10, 2006
      Bugs: #150292
        ID: 200611-05

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Synopsis
========

An incorrect seteuid() call could allow an FTP user to access some
files or directories that would normally be inaccessible.

Background
==========

net-ftp/ftpd is the Linux Netkit FTP server with optional SSL support.

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

    -------------------------------------------------------------------
     Package       /  Vulnerable  /                         Unaffected
    -------------------------------------------------------------------
  1  net-ftp/ftpd      < 0.17-r4                            >= 0.17-r4

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

Paul Szabo reported that an incorrect seteuid() call after the chdir()
function can allow an attacker to access a normally forbidden
directory, in some very particular circumstances, for example when the
NFS-hosted targetted directory is not reachable by the client-side root
user. Additionally, some potentially exploitable unchecked setuid()
calls were also fixed.

Impact
======

A local attacker might craft his home directory to gain access through
ftpd to normally forbidden directories like /root, possibly with
writing permissions if seteuid() fails and if the ftpd configuration
allows that. The unchecked setuid() calls could also lead to a root FTP
login, depending on the FTP server configuration.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Netkit FTP Server users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-ftp/ftpd-0.17-r4"

References
==========

  [ 1 ] CVE-2006-5778
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5778

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

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

  http://security.gentoo.org/glsa/glsa-200611-05.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 () gentoo org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2006 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/2.5

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