tar: Denial of Service -- Existing Account

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0019
                     [DLA 1623-1] tar security update
                              2 January 2019

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

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           tar
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-20482  

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running tar check for an updated version of the software for their 
         operating system.

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Package        : tar
Version        : 1.27.1-2+deb8u2
CVE ID         : CVE-2018-20482
Debian Bug     : #917377

It was discovered that there was a potential denial of service
vulnerability in tar, the GNU version of the tar UNIX archiving
utility.

The --sparse argument looped endlessly if the file shrank whilst
it was being read. Tar would only break out of this endless loop
if the file grew again to (or beyond) its original end of file.

For Debian 8 "Jessie", this issue has been fixed in tar version
1.27.1-2+deb8u2.

We recommend that you upgrade your tar packages.


Regards,

- - -- 
      ,''`.
     : :'  :     Chris Lamb
     `. `'`      lamby@debian.org / chris-lamb.co.uk
       `-

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