==========================================================================
Ubuntu Security Notice USN-3834-1
December 03, 2018

perl vulnerabilities
==========================================================================

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Perl.

Software Description:
- perl: Practical Extraction and Report Language

Details:

Jayakrishna Menon discovered that Perl incorrectly handled Perl_my_setenv.
An attacker could use this issue to cause Perl to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2018-18311)

Eiichi Tsukata discovered that Perl incorrectly handled certain regular
expressions. An attacker could use this issue to cause Perl to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 18.10.
(CVE-2018-18312)

Eiichi Tsukata discovered that Perl incorrectly handled certain regular
expressions. An attacker could use this issue to cause Perl to crash,
resulting in a denial of service. (CVE-2018-18313)

Jakub Wilk discovered that Perl incorrectly handled certain regular
expressions. An attacker could use this issue to cause Perl to crash,
resulting in a denial of service. This issue only affected Ubuntu 16.04
LTS, Ubuntu 18.04 LTS, and Ubuntu 18.10. (CVE-2018-18314)

Update instructions:

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

Ubuntu 18.10:
  perl                            5.26.2-7ubuntu0.1

Ubuntu 18.04 LTS:
  perl                            5.26.1-6ubuntu0.3

Ubuntu 16.04 LTS:
  perl                            5.22.1-9ubuntu0.6

Ubuntu 14.04 LTS:
  perl                            5.18.2-2ubuntu1.7

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

References:
  https://usn.ubuntu.com/usn/usn-3834-1
  CVE-2018-18311, CVE-2018-18312, CVE-2018-18313, CVE-2018-18314

Package Information:
  https://launchpad.net/ubuntu/+source/perl/5.26.2-7ubuntu0.1
  https://launchpad.net/ubuntu/+source/perl/5.26.1-6ubuntu0.3
  https://launchpad.net/ubuntu/+source/perl/5.22.1-9ubuntu0.6
  https://launchpad.net/ubuntu/+source/perl/5.18.2-2ubuntu1.7