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Gentoo Linux Security Advisory                           GLSA 201709-12
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Perl: Race condition vulnerability
     Date: September 17, 2017
     Bugs: #620304
       ID: 201709-12

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Synopsis
========

A vulnerability in module File::Path for Perl allows local attackers to
set arbitrary mode values on arbitrary files bypassing security
restrictions.

Background
==========

File::Path module provides a convenient way to create directories of
arbitrary depth and to delete an entire directory subtree from the
filesystem.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-lang/perl              < 5.24.1-r2              >= 5.24.1-r2 
  2  perl-core/File-Path         < 2.130.0                 >= 2.130.0 
  3  virtual/perl-File-Path      < 2.130.0                 >= 2.130.0 
    -------------------------------------------------------------------
     3 affected packages

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

A race condition occurs within concurrent environments. This condition
was discovered by The cPanel Security Team in the rmtree and
remove_tree functions in the File-Path module before 2.13 for Perl.
This is due to the  time-of-check-to-time-of-use (TOCTOU) race
condition between the stat() that decides the inode is a directory and
the chmod() that tries to make it user-rwx.

Impact
======

A local attacker could exploit this condition to set arbitrary mode
values on arbitrary files and hence bypass security restrictions.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Perl users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-lang/perl-5.24.1-r2"

All File-Path users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=perl-core/File-Path-2.130.0"

All Perl-File-Path users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=virtual/perl-File-Path-2.130.0"

References
==========

[ 1 ] CVE-2017-6512
      https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-6512

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

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

 https://security.gentoo.org/glsa/201709-12

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
https://bugs.gentoo.org.

License
=======

Copyright 2017 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