A rsync security update has been released for Ubuntu Linux 18.04 LTS and 16.04 LTS.

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Ubuntu Security Notice USN-4292-1
February 25, 2020

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in rsync.

Software Description:
- rsync: fast, versatile, remote (and local) file-copying tool

Details:

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

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

It was discovered that rsync incorrectly handled vectors involving big-endian
CRC calculation in zlib. An attacker could use this issue to cause rsync 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 18.04 LTS:
rsync 3.1.2-2.1ubuntu1.1

Ubuntu 16.04 LTS:
rsync 3.1.1-3ubuntu1.3

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

References:
  https://usn.ubuntu.com/4292-1
CVE-2016-9840, CVE-2016-9841, CVE-2016-9842, CVE-2016-9843

Package Information:
  https://launchpad.net/ubuntu/+source/rsync/3.1.2-2.1ubuntu1.1
  https://launchpad.net/ubuntu/+source/rsync/3.1.1-3ubuntu1.3