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TUCoPS :: Linux :: Gentoo :: b06-2762.htm

Shadow: privilege escalation



shadow: Privilege escalation
shadow: Privilege escalation



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Gentoo Linux Security Advisory                           GLSA 200606-02
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: shadow: Privilege escalation
      Date: June 07, 2006
      Bugs: #133615
        ID: 200606-02

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Synopsis
=======
A security issue in shadow allows a local user to perform certain
actions with escalated privileges.

Background
=========
shadow provides a set of utilities to deal with user accounts.

Affected packages
================
    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  sys-apps/shadow      < 4.0.15-r2                     >= 4.0.15-r2

Description
==========
When the mailbox is created in useradd, the "open()" function does not
receive the three arguments it expects while O_CREAT is present, which
leads to random permissions on the created file, before fchmod() is
executed.

Impact
=====
Depending on the random permissions given to the mailbox file which is
at this time owned by root, a local user may be able to open this file
for reading or writing, or even executing it, maybe as the root user.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All shadow users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.0.15-r2"

References
=========
  [ 1 ] CVE-2006-1174
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1174 

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

http://security.gentoo.org/glsa/glsa-200606-02.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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