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Gentoo Linux Security Advisory                           GLSA 200410-19
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: glibc: Insecure tempfile handling in catchsegv script
      Date: October 21, 2004
      Bugs: #66358
        ID: 200410-19

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Synopsis
========

The catchsegv script in the glibc package is vulnerable to symlink
attacks, potentially allowing a local user to overwrite arbitrary
files with the rights of the user running the script.

Background
==========

glibc is a package that contains the GNU C library.

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

    -------------------------------------------------------------------
     Package         /      Vulnerable      /               Unaffected
    -------------------------------------------------------------------
  1  sys-libs/glibc      <= 2.3.4.20040808                *>= 2.2.5-r9
                                                         *>= 2.3.2-r12
                                                 *>= 2.3.3.20040420-r2
                                                 *>= 2.3.4.20040619-r2
                                                  >= 2.3.4.20040808-r1

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

The catchsegv script creates temporary files in world-writeable
directories 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
catchsegv script is called, 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 glibc users should upgrade to the latest version:

    # emerge sync

    # emerge -pv sys-libs/glibc
    # emerge sys-libs/glibc

References
==========

  [ 1 ] CAN-2004-0968
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0968

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

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

  http://security.gentoo.org/glsa/glsa-200410-19.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 2004 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/1.0