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Gentoo Linux Security Advisory                           GLSA 200509-21

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                                            http://security.gentoo.org/

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  Severity: Normal

     Title: Hylafax: Insecure temporary file creation in xferfaxstats

            script

      Date: September 30, 2005

      Bugs: #106882

        ID: 200509-21



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Synopsis

========



Hylafax is vulnerable to linking attacks, potentially allowing a local

user to overwrite arbitrary files.



Background

==========



Hylafax is a client-server fax package for class 1 and 2 fax modems.



Affected packages

=================



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

     Package           /  Vulnerable  /                     Unaffected

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

  1  net-misc/hylafax       < 4.2.2                       *>= 4.2.0-r3

                                                          *>= 4.2.1-r2

                                                              >= 4.2.2



Description

===========



Javier Fernandez-Sanguino has discovered that xferfaxstats cron script

supplied by Hylafax insecurely creates temporary files with predictable

filenames.



Impact

======



A local attacker could create symbolic links in the temporary file

directory, pointing to a valid file somewhere on the filesystem. When

the xferfaxstats script of Hylafax is executed, this would result in

the file being overwritten with the rights of the user running the

script, which typically is the root user.



Workaround

==========



There is no known workaround at this time.



Resolution

==========



All Hylafax users should upgrade to the latest version:



    # emerge --sync

    # emerge --ask --oneshot --verbose net-misc/hylafax



References

==========



  [ 1 ] Original bug report

        http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=329384



Availability

============



This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:



  http://security.gentoo.org/glsa/glsa-200509-21.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 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





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