[USN-3861-1] PolicyKit vulnerability


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From: Marc Deslauriers
Reply-To: Ubuntu Security
To: ubuntu-security-announce@lists.ubuntu.com
Message-ID:
Subject: [USN-3861-1] PolicyKit vulnerability

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Ubuntu Security Notice USN-3861-1
January 16, 2019

policykit-1 vulnerability
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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

Summary:

PolicyKit could allow unintended access.

Software Description:
– policykit-1: framework for managing administrative policies and privile=
ges

Details:

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.

References:
https://usn.ubuntu.com/usn/usn-3861-1
CVE-2018-19788

Package Information:
https://launchpad.net/ubuntu/+source/policykit-1/0.105-21ubuntu0.3
https://launchpad.net/ubuntu/+source/policykit-1/0.105-20ubuntu0.18.04.=
4
https://launchpad.net/ubuntu/+source/policykit-1/0.105-14.1ubuntu0.4
https://launchpad.net/ubuntu/+source/policykit-1/0.105-4ubuntu3.14.04.5=

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