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Ubuntu Security Notice USN-4053-1

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Ubuntu Security Notice USN-4053-1
July 09, 2019

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in GVfs.

Software Description:
- gvfs: Userspace virtual filesystem

Details:

It was discovered that GVfs incorrectly handled the admin backend. Files
created or moved by the admin backend could end up with the wrong ownership
information, contrary to expectations. This issue only affected Ubuntu
18.04 LTS, Ubuntu 18.10, and Ubuntu 19.04. (CVE-2019-12447, CVE-2019-12448,
CVE-2019-12449)

It was discovered that GVfs incorrectly handled authentication on its
private D-Bus socket. A local attacker could possibly connect to this
socket and issue D-Bus calls. (CVE-2019-12795)

Update instructions:

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

Ubuntu 19.04:
gvfs 1.40.1-1ubuntu0.1
gvfs-backends 1.40.1-1ubuntu0.1

Ubuntu 18.10:
gvfs 1.38.1-0ubuntu1.3.2
gvfs-backends 1.38.1-0ubuntu1.3.2

Ubuntu 18.04 LTS:
gvfs 1.36.1-0ubuntu1.3.3
gvfs-backends 1.36.1-0ubuntu1.3.3

Ubuntu 16.04 LTS:
gvfs 1.28.2-1ubuntu1~16.04.3
gvfs-backends 1.28.2-1ubuntu1~16.04.3

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

References:
https://usn.ubuntu.com/4053-1
CVE-2019-12447, CVE-2019-12448, CVE-2019-12449, CVE-2019-12795

Package Information:
https://launchpad.net/ubuntu/+source/gvfs/1.40.1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/gvfs/1.38.1-0ubuntu1.3.2
https://launchpad.net/ubuntu/+source/gvfs/1.36.1-0ubuntu1.3.3
https://launchpad.net/ubuntu/+source/gvfs/1.28.2-1ubuntu1~16.04.3

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