USN-3934-1: PolicyKit vulnerability

Releases

• Ubuntu 18.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• 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

• libpolkit-backend-1-0 - 0.105-20ubuntu0.18.04.5
• policykit-1 - 0.105-20ubuntu0.18.04.5

Ubuntu 16.04

• libpolkit-backend-1-0 - 0.105-14.1ubuntu0.5
• policykit-1 - 0.105-14.1ubuntu0.5

Ubuntu 14.04

• libpolkit-backend-1-0 - 0.105-4ubuntu3.14.04.6
• policykit-1 - 0.105-4ubuntu3.14.04.6

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

References

• CVE-2019-6133

Related notices

• USN-3903-2: linux-image-azure, linux-image-lowlatency-hwe-18.04, linux-hwe, linux-image-4.18.0-16-generic, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04, linux-image-4.18.0-16-generic-lpae, linux-image-4.18.0-16-snapdragon, linux-image-4.18.0-16-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-4.18.0-1013-azure, linux-azure
• USN-3934-2: policykit-1, libpolkit-backend-1-0
• USN-3901-1: linux-image-virtual-hwe-16.04-edge, linux-kvm, linux-image-4.15.0-1033-aws, linux-image-4.15.0-1028-gcp, linux-image-gcp, linux-image-generic-lpae, linux-image-4.15.0-46-generic, linux-image-virtual, linux-image-snapdragon, linux-image-oracle, linux-image-gke, linux-image-aws, linux-image-raspi2, linux-image-kvm, linux-image-generic-lpae-hwe-16.04-edge, linux-gcp, linux-raspi2, linux-oracle, linux-oem, linux-image-4.15.0-1032-raspi2, linux-image-lowlatency, linux-image-4.15.0-46-snapdragon, linux-image-4.15.0-1009-oracle, linux, linux-image-4.15.0-46-generic-lpae, linux-image-4.15.0-1030-kvm, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-46-lowlatency, linux-image-generic-hwe-16.04, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1034-oem, linux-image-generic, linux-image-lowlatency-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-oem, linux-aws
• USN-3901-2: linux-image-azure, linux-image-4.15.0-1033-aws, linux-image-4.15.0-1028-gcp, linux-image-4.15.0-1040-azure, linux-image-gcp, linux-image-4.15.0-46-generic, linux-image-lowlatency-hwe-16.04, linux-image-oracle, linux-image-gke, linux-gcp, linux-hwe, linux-oracle, linux-image-4.15.0-1009-oracle, linux-azure, linux-image-4.15.0-46-generic-lpae, linux-image-4.15.0-46-lowlatency, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-virtual-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-aws-hwe, linux-image-oem
• USN-3910-2: linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1039-aws, linux-image-generic-lpae-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-143-generic, linux-image-generic-lts-xenial, linux-image-aws, linux-image-4.4.0-143-lowlatency, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-143-powerpc64-emb, linux-image-4.4.0-143-powerpc-e500mc, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-143-powerpc64-smp, linux-image-powerpc-smp-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-143-powerpc-smp, linux-image-4.4.0-143-generic-lpae, linux-lts-xenial, linux-aws
• USN-3910-1: linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-1108-snapdragon, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-utopic, linux-kvm, linux-image-powerpc-e500mc, linux-snapdragon, linux-image-generic-lpae, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-utopic, linux-image-generic-lts-vivid, linux-image-virtual, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-xenial, linux-image-snapdragon, linux-image-powerpc64-emb-lts-vivid, linux-image-4.4.0-143-generic, linux-image-generic-lts-xenial, linux-image-aws, linux-image-generic-lpae-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-4.4.0-143-lowlatency, linux-image-generic-lpae-lts-wily, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-143-powerpc64-emb, linux-image-raspi2, linux-image-virtual-lts-utopic, linux-image-kvm, linux-image-lowlatency-lts-vivid, linux-image-powerpc-smp-lts-vivid, linux-raspi2, linux-image-4.4.0-143-powerpc-e500mc, linux-image-generic-lts-utopic, linux-image-virtual-lts-vivid, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc-smp, linux-image-lowlatency, linux-image-4.4.0-143-powerpc64-smp, linux-image-4.4.0-1041-kvm, linux, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-wily, linux-image-4.4.0-143-powerpc-smp, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-1104-raspi2, linux-image-4.4.0-143-generic-lpae, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-1077-aws, linux-image-powerpc-smp-lts-wily, linux-image-generic, linux-image-lowlatency-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux-aws
• USN-3908-1: linux-image-3.13.0-166-powerpc64-smp, linux-image-powerpc64-emb, linux-image-3.13.0-166-powerpc-e500mc, linux-image-powerpc-e500mc, linux-image-generic-lpae, linux-image-powerpc64-smp, linux-image-virtual, linux-image-3.13.0-166-generic-lpae, linux-image-powerpc-e500, linux-image-generic-lpae-lts-trusty, linux-image-omap, linux-image-generic-lpae-lts-saucy, linux-image-3.13.0-166-powerpc-smp, linux-image-generic-lts-raring, linux-image-highbank, linux-image-generic-lts-saucy, linux-image-3.13.0-166-generic, linux-image-lowlatency-pae, linux-image-powerpc-smp, linux-image-lowlatency, linux-image-3.13.0-166-lowlatency, linux, linux-image-generic-pae, linux-image-generic-lts-quantal, linux-image-3.13.0-166-powerpc-e500, linux-image-generic-lts-trusty, linux-image-3.13.0-166-powerpc64-emb, linux-image-generic
• USN-3908-2: linux-image-3.13.0-166-generic, linux-image-generic-lts-trusty, linux-image-3.13.0-166-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-3.13.0-166-lowlatency
• USN-3903-1: linux-image-azure, linux-image-4.18.0-1008-kvm, linux-kvm, linux-image-4.18.0-16-snapdragon, linux-image-gcp, linux-image-generic-lpae, linux-image-4.18.0-1013-azure, linux-image-snapdragon, linux-image-4.18.0-16-generic, linux-image-gke, linux-image-4.18.0-1007-gcp, linux-image-raspi2, linux-image-kvm, linux-gcp, linux-raspi2, linux-image-4.18.0-16-lowlatency, linux-image-lowlatency, linux, linux-azure, linux-image-4.18.0-1010-raspi2, linux-image-4.18.0-16-generic-lpae, linux-image-generic