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Red Hat: RHSA-2016-2577-02 Moderate: Libvirt Security Flaws

red hat
Calendar Grey November 3, 2016
Scroller Redhat
A recent libvirt upgrade for Fedora brings critical patches and improvements aimed at bolstering system security.
An update for libvirt is now available for Red Hat Enterprise Linux 7

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing the updated packages, libvirtd will be restarted automatically.

Summary

The libvirt library contains a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.
The following packages have been upgraded to a newer upstream version: libvirt (2.0.0). (BZ#830971, BZ#1286679)
Security Fix(es):
* It was found that the libvirt daemon, when using RBD (RADOS Block Device), leaked private credentials to the process list. A local attacker could use this flaw to perform certain privileged operations within the cluster. (CVE-2015-5160)
* A path-traversal flaw was found in the way the libvirt daemon handled filesystem names for storage volumes. A libvirt user with privileges to create storage volumes and without privileges to create and modify domains could possibly use this flaw to escalate their privileges. (CVE-2015-5313)
* It was found that setting a VNC password to an empty string in libvirt did not disable all access to the VNC server as documented, instead it allowed access with no authentication required. An attacker could use this flaw to access a VNC server with an empty VNC password without any authentication. (CVE-2016-5008)
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory Red Hat moderate impact path traversal credential leak libvirt VNC access

References

https://access.redhat.com/security/cve/CVE-2015-5160 https://access.redhat.com/security/cve/CVE-2015-5313 https://access.redhat.com/security/cve/CVE-2016-5008 https://access.redhat.com/security/updates/classification#moderate https://docs.redhat.com/en/documentation/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: libvirt-2.0.0-10.el7.src.rpm
x86_64: libvirt-2.0.0-10.el7.x86_64.rpm libvirt-client-2.0.0-10.el7.i686.rpm libvirt-client-2.0.0-10.el7.x86_64.rpm libvirt-daemon-2.0.0-10.el7.x86_64.rpm libvirt-daemon-config-network-2.0.0-10.el7.x86_64.rpm libvirt-daemon-config-nwfilter-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-interface-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-lxc-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-network-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-nodedev-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-nwfilter-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-qemu-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-secret-2.0.0-10.el7.x86_64.rpm libvirt-daemon-driver-storage-2.0.0-10.el7.x86_64.rpm libvirt-daemon-kvm-2.0.0-10.el7.x86_64.rpm libvirt-debuginfo-2.0.0-10.el7.i686.rpm libvirt-debuginfo-2.0.0-10.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: libvirt-daemon-lxc-2.0.0-10.el7.x86_64.rpm libvirt-debuginfo-2.0.0-10.el7.i686.rpm libvirt-debuginfo-2.0.0-10.el7.x86_64.rpm libvirt-devel-2.0.0-10.el7.i686.rpm libvirt-devel-2.0.0-10.el7.x86_64.rpm libvirt-docs-2.0.0-10.el7.x86_64.rpm libvirt-lock-sanlock-2.0.0-10.el7.x86_64.rpm libvirt-login-shell-2.0.0-10.el7.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2016:2577-02
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2577.html
Issue date: 2016-11-03

Topic

An update for libvirt is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat moderate impact path traversal credential leak libvirt VNC access

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

846810 - Automagically iptables rules added by libvirt can't be avoided/disabled

868771 - The virtual size of the vol should not be reduced after wiped

921135 - qemu: could not load kernel ... Permission denied

986365 - using polkit with virsh for non-root access does not work via ssh or locally

997561 - RFE: virsh: provide easy pci-passthrough netdev attach command

1002423 - Libvirt should forbid or remove the duplicate /

subelements in element of virtual network

1004593 - libvirt should provide a more useful error message when a PCI controller is configured to plug into itself (bus = index)

1004602 - error message need be improved for q35 guest with wrong controller

1025230 - libvirt activate pool with invalid source.

1026136 - Volume download speed is slow

1038888 - [Doc] 3 problems in nwfilter doc

1046833 - Warn users against setting memory hard limit too high when used for mlock or rdma-pin-all

1051350 - Support the readonly attribute for SCSI passthrough devices

1055331 - virDevicePCIAddressParseXML check failed for PCI device 0000:00:00.0

1077068 - Wrong allocation size when create/resize volumes in NFS pool

1097930 - [RFE] Hot Un-Plug CPU - Support dynamic virtual CPU deallocation - libvirt

1103314 - RFE: configure guest NUMA node locality for guest PCI devices

1103845 - glusterfs backend does not support discard (libvirt)

Read the Full Advisory

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