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Ubuntu Security Notice USN-4292-1

Ubuntu Security Notice USN-4292-1
Posted Feb 25, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4292-1 - 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. 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. 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 | a3ff08576453bf2b0102d69a22f053e1

Ubuntu Security Notice USN-4292-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4292-1
February 25, 2020

rsync vulnerabilities
==========================================================================

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

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