zlib vulnerabilities

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

* Ubuntu 16.04 LTS

Summary

Several security issues were fixed in zlib

Software Description

* zlib - Lossless data-compression library

Details

It was discovered that zlib incorrectly handled pointer
arithmetic. An attacker could use this issue to cause zlib to
crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-9840, CVE-2016-9841)

It was discovered that zlib incorrectly handled vectors involving
left shifts of negative integers. An attacker could use this issue
to cause zlib to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2016-9842)

It was discovered that zlib incorrectly handled vectors involving
big-endian CRC calculation. An attacker could use this issue to
cause zlib to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2016-9843)

Update instructions

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

Ubuntu 16.04 LTS
lib32z1 - 1:1.2.8.dfsg-2ubuntu4.3
lib64z1 - 1:1.2.8.dfsg-2ubuntu4.3
libn32z1 - 1:1.2.8.dfsg-2ubuntu4.3
libx32z1 - 1:1.2.8.dfsg-2ubuntu4.3
zlib1g - 1:1.2.8.dfsg-2ubuntu4.3

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

* CVE-2016-9840
* CVE-2016-9841
* CVE-2016-9842
* CVE-2016-9843

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