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AUSCERT External Security Bulletin Redistribution
ESB-2018.2066.2
PolicyKit vulnerabilities
18 July 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: policykit
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-1116 CVE-2015-4625 CVE-2015-3255
CVE-2015-3218
Original Bulletin:
http://www.ubuntu.com/usn/usn-3717-1
http://www.ubuntu.com/usn/usn-3717-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running policykit check for an updated version of the software for
their operating system.
Revision History: July 18 2018: This update provides the corresponding
update for Ubuntu 12.04 ESM.
July 17 2018: Initial Release
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Ubuntu Security Notice USN-3717-1
July 16, 2018
policykit-1 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - - Ubuntu 18.04 LTS
- - - Ubuntu 17.10
- - - Ubuntu 16.04 LTS
- - - Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in PolicyKit.
Software Description:
- - - policykit-1: framework for managing administrative policies and privileges
Details:
Tavis Ormandy discovered that PolicyKit incorrectly handled certain invalid
object paths. A local attacker could possibly use this issue to cause
PolicyKit to crash, resulting in a denial of service. This issue only
affected Ubuntu 14.04 LTS. (CVE-2015-3218)
It was discovered that PolicyKit incorrectly handled certain duplicate
action IDs. A local attacker could use this issue to cause PolicyKit to
crash, resulting in a denial of service, or possibly escalate privileges.
This issue only affected Ubuntu 14.04 LTS. (CVE-2015-3255)
Tavis Ormandy discovered that PolicyKit incorrectly handled duplicate
cookie values. A local attacker could use this issue to cause PolicyKit to
crash, resulting in a denial of service, or possibly escalate privileges.
This issue only affected Ubuntu 14.04 LTS. (CVE-2015-4625)
Matthias Gerstner discovered that PolicyKit incorrectly checked users. A
local attacker could possibly use this issue to cause authentication
dialogs to show up for other users, leading to a denial of service or an
information leak. (CVE-2018-1116)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
libpolkit-backend-1-0 0.105-20ubuntu0.18.04.1
Ubuntu 17.10:
libpolkit-backend-1-0 0.105-18ubuntu0.1
Ubuntu 16.04 LTS:
libpolkit-backend-1-0 0.105-14.1ubuntu0.1
Ubuntu 14.04 LTS:
libpolkit-backend-1-0 0.105-4ubuntu3.14.04.2
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
https://usn.ubuntu.com/usn/usn-3717-1
CVE-2015-3218, CVE-2015-3255, CVE-2015-4625, CVE-2018-1116
Package Information:
https://launchpad.net/ubuntu/+source/policykit-1/0.105-20ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/policykit-1/0.105-18ubuntu0.1
https://launchpad.net/ubuntu/+source/policykit-1/0.105-14.1ubuntu0.1
https://launchpad.net/ubuntu/+source/policykit-1/0.105-4ubuntu3.14.04.2
- --------------------------------------------------------------------------------
==========================================================================
Ubuntu Security Notice USN-3717-2
July 17, 2018
policykit-1 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 12.04 ESM
Summary:
Several security issues were fixed in PolicyKit.
Software Description:
- - policykit-1: framework for managing administrative policies and
privileges
Details:
USN-3717-1 fixed a vulnerability in PolicyKit. This update provides
the corresponding update for Ubuntu 12.04 ESM.
Original advisory details:
It was discovered that PolicyKit incorrectly handled certain duplicate
action IDs. A local attacker could use this issue to cause PolicyKit
to crash, resulting in a denial of service, or possibly escalate
privileges. (CVE-2015-3255)
Matthias Gerstner discovered that PolicyKit incorrectly checked users.
A local attacker could possibly use this issue to cause authentication
dialogs to show up for other users, leading to a denial of service or
an information leak. (CVE-2018-1116)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 12.04 ESM:
libpolkit-backend-1-0 0.104-1ubuntu1.2
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
https://usn.ubuntu.com/usn/usn-3717-2
https://usn.ubuntu.com/usn/usn-3717-1
CVE-2015-3255, CVE-2018-1116
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