Executive Summary

Title PolicyKit vulnerability
Name USN-3861-1 First vendor Publication 2019-01-16
Vendor Ubuntu Last vendor Modification 2019-01-16
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
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:S/C:C/I:C/A:C)
Cvss Base Score 9 Attack Range Network
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 8 Authentication Requires single instance
Calculate full CVSS 2.0 Vectors scores


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

- Ubuntu 18.10 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS


PolicyKit could allow unintended access.

Software Description: - policykit-1: framework for managing administrative policies and privileges


It was discovered that PolicyKit incorrectly handled certain large user UIDs. A local attacker with a large UID could possibly use this issue to perform privileged actions.

Update instructions:

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

Ubuntu 18.10:
libpolkit-backend-1-0 0.105-21ubuntu0.3
policykit-1 0.105-21ubuntu0.3

Ubuntu 18.04 LTS:
libpolkit-backend-1-0 0.105-20ubuntu0.18.04.4
policykit-1 0.105-20ubuntu0.18.04.4

Ubuntu 16.04 LTS:
libpolkit-backend-1-0 0.105-14.1ubuntu0.4
policykit-1 0.105-14.1ubuntu0.4

Ubuntu 14.04 LTS:
libpolkit-backend-1-0 0.105-4ubuntu3.14.04.5
policykit-1 0.105-4ubuntu3.14.04.5

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


Package Information:

Original Source

Url : http://www.ubuntu.com/usn/USN-3861-1

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Application 1
Os 5
Os 2

Nessus® Vulnerability Scanner

Date Description
2019-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2018-2f8696869e.nasl - Type : ACT_GATHER_INFO
2019-01-03 Name : The remote Fedora host is missing a security update.
File : fedora_2018-4ac3c68ee4.nasl - Type : ACT_GATHER_INFO
2018-12-07 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-4350.nasl - Type : ACT_GATHER_INFO

Alert History

If you want to see full details history, please login or register.
Date Informations
2019-02-05 21:21:51
  • Multiple Updates
2019-01-17 17:21:10
  • Multiple Updates
2019-01-16 17:18:33
  • First insertion