USN-4053-1: GVfs vulnerabilities

9 July 2019

gvfs vulnerabilities

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References