[USN-3625-2] Perl vulnerabilities

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3625-2
April 17, 2018

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

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Perl.

Software Description:
- perl: Practical Extraction and Report Language

Details:

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. (CVE-2018-6913)

Update instructions:

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

Ubuntu 12.04 ESM:
  perl                            5.14.2-6ubuntu2.7

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

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