[USN-3506-2] rsync vulnerabilities

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[USN-3506-2] rsync vulnerabilities

Leonidas S. Barbosa
==========================================================================
Ubuntu Security Notice USN-3506-2
December 07, 2017

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

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in rsync.

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

Details:

USN-3506-1 fixed two vulnerabilities in rsync. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory 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 12.04 ESM:
  rsync                           3.0.9-1ubuntu1.2

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

References:
  https://www.ubuntu.com/usn/usn-3506-2
  https://www.ubuntu.com/usn/usn-3506-1
  CVE-2017-17433, CVE-2017-17434

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