lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <20050406221621.GB24456@tomservo.hsd1.ma.comcast.net>
Date: Sun Jul 17 15:03:54 2005
From: lewk at gentoo.org (Luke Macken)
Subject: [gentoo-announce] [ GLSA 200504-06 ] sharutils:
	Insecure temporary file creation

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200504-06
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: sharutils: Insecure temporary file creation
      Date: April 06, 2005
      Bugs: #87939
        ID: 200504-06

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

The unshar utility is vulnerable to symlink attacks, potentially
allowing a local user to overwrite arbitrary files.

Background
==========

sharutils is a collection of tools to deal with shar archives.

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

    -------------------------------------------------------------------
     Package             /   Vulnerable   /                 Unaffected
    -------------------------------------------------------------------
  1  app-arch/sharutils      < 4.2.1-r11                  >= 4.2.1-r11

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

Joey Hess has discovered that the program unshar, which is a part of
sharutils, creates temporary files in a world-writable directory with
predictable names.

Impact
======

A local attacker could create symbolic links in the temporary files
directory, pointing to a valid file somewhere on the filesystem. When
unshar is executed, this would result in the file being overwritten
with the rights of the user running the utility, which could be the
root user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All sharutils users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/sharutils-4.2.1-r11"

References
==========

  [ 1 ] Ubuntu Advisory
        http://www.ubuntulinux.org/support/documentation/usn/usn-104-1

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

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

  http://security.gentoo.org/glsa/glsa-200504-06.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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 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/2.0
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20050717/7b2da203/attachment.bin

Powered by blists - more mailing lists