[USN-3834-1] Perl vulnerabilities

-----BEGIN PGP SIGNATURE-----
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=JC3G
-----END PGP SIGNATURE-----
==========================================================================
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