Executive Summary

Summary
Title LightDM vulnerability
Informations
Name USN-3285-1 First vendor Publication 2017-05-12
Vendor Ubuntu Last vendor Modification 2017-05-12
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
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Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:P/I:N/A:N)
Cvss Base Score 2.1 Attack Range Local
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
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Detail

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

- Ubuntu 17.04 - Ubuntu 16.10

Summary:

LightDM could allow unintended access to files.

Software Description: - lightdm: Display Manager

Details:

Tyler Hicks discovered that LightDM did not confine the user session for guest users. An attacker with physical access could use this issue to access files and other resources that they should not be able to access. In the default installation, this includes files in the home directories of other users on the system. This update fixes the issue by disabling the guest session. It may be re-enabled in a future update. Please see the bug referenced below for instructions on how to manually re-enable the guest session.

Update instructions:

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

Ubuntu 17.04:
lightdm 1.22.0-0ubuntu2.1

Ubuntu 16.10:
lightdm 1.19.5-0ubuntu1.2

After a standard system update you need to reboot your computer to make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-3285-1
CVE-2017-8900, https://launchpad.net/bugs/1663157

Package Information:
https://launchpad.net/ubuntu/+source/lightdm/1.22.0-0ubuntu2.1
https://launchpad.net/ubuntu/+source/lightdm/1.19.5-0ubuntu1.2

Original Source

Url : http://www.ubuntu.com/usn/USN-3285-1

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 8

Nessus® Vulnerability Scanner

Date Description
2018-01-15 Name : The remote Fedora host is missing a security update.
File : fedora_2017-159a1060f6.nasl - Type : ACT_GATHER_INFO
2017-09-15 Name : The remote Fedora host is missing a security update.
File : fedora_2017-66adafeb3b.nasl - Type : ACT_GATHER_INFO
2017-09-15 Name : The remote Fedora host is missing a security update.
File : fedora_2017-d793fef58f.nasl - Type : ACT_GATHER_INFO
2017-05-12 Name : The remote Ubuntu host is missing a security-related patch.
File : ubuntu_USN-3285-1.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
2
3
Date Informations
2017-05-26 21:24:15
  • Multiple Updates
2017-05-13 13:24:41
  • Multiple Updates
2017-05-12 13:27:54
  • Multiple Updates
2017-05-12 05:20:13
  • First insertion