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             AUSCERT External Security Bulletin Redistribution

                           Perl vulnerabilities
                               20 April 2018


        AusCERT Security Bulletin Summary

Product:           perl
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Modify Permissions              -- Remote/Unauthenticated      
                   Denial of Service               -- Remote/Unauthenticated      
                   Read-only Data Access           -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6913 CVE-2018-6798 CVE-2018-6797
                   CVE-2017-6512 CVE-2016-6185 CVE-2015-8853

Reference:         ESB-2018.1144

Original Bulletin: 

Revision History:  April 20 2018: Update to include Ubuntu 12.04 ESM
                   April 17 2018: Initial Release

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USN-3625-2: Perl vulnerabilities

17 April 2018

perl vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 12.04 ESM


Several security issues were fixed in Perl.

Software Description

  o perl - Practical Extraction and Report Language


USN-3625-1 fixed a vulnerability in Perl. This update provides the
corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

It was discovered that Perl incorrectly handled certain regular expressions. An
attacker could possibly use this issue to cause Perl to hang, resulting in a
denial of service. (CVE-2015-8853)

It was discovered that Perl incorrectly loaded libraries from the current
working directory. A local attacker could possibly use this issue to execute
arbitrary code. (CVE-2016-6185)

It was discovered that Perl incorrectly handled the rmtree and remove_tree
functions. A local attacker could possibly use this issue to set the mode on
arbitrary files. (CVE-2017-6512)

GwanYeong Kim discovered that Perl incorrectly handled certain data when using
the pack function. An attacker could use this issue to cause Perl to crash,
resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package

Ubuntu 12.04 ESM
    perl - 5.14.2-6ubuntu2.7

To update your system, please follow these instructions: https://

In general, a standard system update will make all the necessary changes.


  o https://usn.ubuntu.com/usn/usn-3625-2
  o https://usn.ubuntu.com/usn/usn-3625-1
  o CVE-2015-8853
  o CVE-2016-6185
  o CVE-2017-6512
  o CVE-2018-6913

(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
Canonical Ltd.

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