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[GLSA 200606-02] shadow: Privilege escalation

Wednesday, 07 June 2006

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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_at_gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=====

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

http://creativecommons.org/licenses/by-sa/2.5

Original Advisory:
http://seclists.org/lists/fulldisclosure/2006/Jun/0184.html

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