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AUSCERT External Security Bulletin Redistribution
ESB-2019.1135
USN-3934-1: PolicyKit vulnerability
4 April 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: PolicyKit
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6133
Reference: ESB-2019.0856
ESB-2019.0791.2
ESB-2019.0716
ESB-2019.0691
ESB-2019.0670
Original Bulletin:
https://usn.ubuntu.com/3934-1/
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USN-3934-1: PolicyKit vulnerability
3 April 2019
policykit-1 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 LTS
Summary
PolicyKit could allow unintended access.
Software Description
o policykit-1 - framework for managing administrative policies and privileges
Details
It was discovered that PolicyKit incorrectly relied on the fork() system call
in the Linux kernel being atomic. A local attacker could possibly use this
issue to gain access to services that have cached authorizations.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.10
libpolkit-backend-1-0 - 0.105-21ubuntu0.4
policykit-1 - 0.105-21ubuntu0.4
Ubuntu 18.04 LTS
libpolkit-backend-1-0 - 0.105-20ubuntu0.18.04.5
policykit-1 - 0.105-20ubuntu0.18.04.5
Ubuntu 16.04 LTS
libpolkit-backend-1-0 - 0.105-14.1ubuntu0.5
policykit-1 - 0.105-14.1ubuntu0.5
Ubuntu 14.04 LTS
libpolkit-backend-1-0 - 0.105-4ubuntu3.14.04.6
policykit-1 - 0.105-4ubuntu3.14.04.6
To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .
After a standard system update you need to reboot your computer to make all the
necessary changes.
References
o CVE-2019-6133
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