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Ubuntu Security Notice USN-3506-1

Ubuntu Security Notice USN-3506-1
Posted Dec 7, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3506-1 - It was discovered that rsync proceeds with certain file metadata updates before checking for a filename. An attacker could use this to bypass access restrictions. It was discovered that rsync does not check for fnamecmp filenames and also does not apply the sanitize_paths protection mechanism to pathnames. An attacker could use this to bypass access restrictions. Various other issues were also addressed.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2017-17433, CVE-2017-17434
MD5 | 0193550d61135df87216b55536f712aa

Ubuntu Security Notice USN-3506-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3506-1
December 07, 2017

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

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

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 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 proceeds with certain file metadata
updates before checking for a filename. An attacker could use this to
bypass access restrictions. (CVE-2017-17433)

It was discovered that rsync does not check for fnamecmp filenames and
also does not apply the sanitize_paths protection mechanism to
pathnames. An attacker could use this to bypass access restrictions.
(CVE-2017-17434)

Update instructions:

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

Ubuntu 17.10:
rsync 3.1.2-2ubuntu0.1

Ubuntu 17.04:
rsync 3.1.2-1ubuntu0.1

Ubuntu 16.04 LTS:
rsync 3.1.1-3ubuntu1.1

Ubuntu 14.04 LTS:
rsync 3.1.0-2ubuntu0.3

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

References:
https://www.ubuntu.com/usn/usn-3506-1
CVE-2017-17433, CVE-2017-17434

Package Information:
https://launchpad.net/ubuntu/+source/rsync/3.1.2-2ubuntu0.1
https://launchpad.net/ubuntu/+source/rsync/3.1.2-1ubuntu0.1
https://launchpad.net/ubuntu/+source/rsync/3.1.1-3ubuntu1.1
https://launchpad.net/ubuntu/+source/rsync/3.1.0-2ubuntu0.3
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