==========================================================================
Ubuntu Security Notice USN-4602-1
October 26, 2020

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

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Perl.

Software Description:
- perl: Practical Extraction and Report Language

Details:

ManhND discovered that Perl incorrectly handled certain regular
expressions. In environments where untrusted regular expressions are
evaluated, a remote attacker could possibly use this issue to cause Perl to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2020-10543)

Hugo van der Sanden and Slaven Rezic discovered that Perl incorrectly
handled certain regular expressions. In environments where untrusted
regular expressions are evaluated, a remote attacker could possibly use
this issue to cause Perl to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2020-10878)

Sergey Aleynikov discovered that Perl incorrectly handled certain regular
expressions. In environments where untrusted regular expressions are
evaluated, a remote attacker could possibly use this issue to cause Perl to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2020-12723)

Update instructions:

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

Ubuntu 20.04 LTS:
  perl                            5.30.0-9ubuntu0.2

Ubuntu 18.04 LTS:
  perl                            5.26.1-6ubuntu0.5

Ubuntu 16.04 LTS:
  perl                            5.22.1-9ubuntu0.9

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

References:
  https://usn.ubuntu.com/4602-1
  CVE-2020-10543, CVE-2020-10878, CVE-2020-12723

Package Information:
  https://launchpad.net/ubuntu/+source/perl/5.30.0-9ubuntu0.2
  https://launchpad.net/ubuntu/+source/perl/5.26.1-6ubuntu0.5
  https://launchpad.net/ubuntu/+source/perl/5.22.1-9ubuntu0.9