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TUCoPS :: Linux :: Gentoo :: b06-5680.htm

Netkit FTP Server: Privilege escalation



Netkit FTP Server: Privilege escalation
Netkit FTP Server: Privilege escalation




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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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