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Ubuntu Security Notice USN-4246-1

Ubuntu Security Notice USN-4246-1
Posted Jan 23, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4246-1 - 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. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2016-9840, CVE-2016-9841, CVE-2016-9842, CVE-2016-9843
MD5 | cabd1479de5aab731a0faa7bd655105f

Ubuntu Security Notice USN-4246-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4246-1
January 22, 2020

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

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

References:
https://usn.ubuntu.com/4246-1
CVE-2016-9840, CVE-2016-9841, CVE-2016-9842, CVE-2016-9843

Package Information:
https://launchpad.net/ubuntu/+source/zlib/1:1.2.8.dfsg-2ubuntu4.3

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