libvirt 1.0.5.x before 1.0.5.6, 0.10.2.x before 0.10.2.8, and 0.9.12.x before 0.9.12.2 allows local users to bypass intended access restrictions by leveraging a PolkitUnixProcess PolkitSubject race condition in pkcheck via a (1) setuid process or (2) pkexec process, a related issue to CVE-2013-4288.

An updated rhev-hypervisor6 package that fixes one security issue and various bugs is now available.

The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes everything necessary to run and manage virtual machines: A subset of the Red Hat Enterprise Linux operating environment and the Red Hat Enterprise Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for the Intel 64 and AMD64 architectures with virtualization extensions.

Upgrade Note: If you upgrade the Red Hat Enterprise Virtualization Hypervisor through the 3.2 Manager administration portal, the Host may appear with the status of 'Install Failed'. If this happens, place the host into maintenance mode, then activate it again to get the host back to an 'Up' state

A stack-based buffer overflow flaw was found in the way the reds_handle_ticket() function in the spice-server library handled decryption of ticket data provided by the client. A remote attacker able to initiate a SPICE connection to the guest could use this flaw to crash the guest. (CVE-2013-4282)

This issue was discovered by Tomas Jamrisko of Red Hat.

This updated package provides updated components that include fixes for various security issues. These issues have no security impact on Red Hat Enterprise Virtualization Hypervisor itself, however. The security fixes included in this update address the following CVE numbers :

CVE-2013-4162 and CVE-2013-4299 (kernel issues)

CVE-2013-4296 and CVE-2013-4311 (libvirt issues)

CVE-2013-4288 (polkit issue)

This update also contains the fixes from the following advisories :

* vdsm: https://rhn.redhat.com/errata/RHBA-2013-1462.html

* ovirt-node: https://rhn.redhat.com/errata/RHBA-2013-1461.html

Users of the Red Hat Enterprise Virtualization Hypervisor are advised to upgrade to this updated package, which corrects these issues.

The remote host is affected by the vulnerability described in GLSA-201406-27 (polkit, Spice-Gtk, systemd, HPLIP, libvirt: Privilege escalation)

    polkit has a race condition which potentially allows a process to change       its UID/EUID via suid or pkexec before authentication is completed.
  Impact :

    A local attacker could start a suid or pkexec process through a       polkit-enabled application, which could result in privilege escalation or       bypass of polkit restrictions.
  Workaround :

    There is no known workaround at this time.

libvirt was updated to fix 2 security issues :

CVE-2013-4311: Add support for using 3-arg pkcheck syntax for process, which previously could be used for race conditions to gain privileges.

CVE-2013-4296: Fix crash in remoteDispatchDomainMemoryStats

libvirt was updated to fix security issues and bugs :

Security issues fixed: CVE-2013-4311: Add support for using 3-arg pkcheck syntax for process to avoid race conditions.

CVE-2013-4296: Fix a crash (denial of service) in remoteDispatchDomainMemoryStats

CVE-2013-5651: Fix virBitmapParse to avoid access beyond bounds of array (denial of service crash).

Also bugs were fixed :

  - nwfilter: check for inverted ctdir. bnc#810611

  - Add xencommons as 'Wanted' in the systemd libvirtd     service file. bnc#820888

libvirt has been updated to the 1.0.5.6 stable release that fixes bugs and security issues :

  - Fix crash in remoteDispatchDomainMemoryStats.
    (CVE-2013-4296)

  - virBitmapParse out-of-bounds read access Libvirt on SLES     11 SP3 is not affected:. (CVE-2013-5651)

  - Add support for using 3-arg pkcheck syntax for process     (). (CVE-2013-4311)

  - security: provide supplemental groups even when parsing     label () Changes in this version:. (CVE-2013-4291)

  - virsh: fix change-media bug on disk block type

  - Include process start time when doing polkit checks

  - qemuDomainChangeGraphics: Check listen address change by     listen type

  - python: return dictionary without value in case of no     blockjob

  - virbitmap: Refactor virBitmapParse to avoid access     beyond bounds of array Also the following bug has been     fixed :

  - Fix retrieval of SRIOV VF info, which prevented using     some SRIOV virtual functions in guest domains with ''     (bnc#837329)

- Allow QoS change with update-device (bz #1014200)

    - Fix nwfilter crash during firewalld install (bz       #1014762)

    - Fix crash with nographics (bz #1014088) Update to       1.1.3 release

  - Sync with v1.1.2-maint

    - Rebuild for libswan soname bump (bz #1009701)

    - CVE-2013-4311: Insecure polkit usage (bz #1009539, bz       #1005332)

    - CVE-2013-4296: Invalid free memory stats (bz #1006173,       bz #1009667)

    - CVE-2013-4297: Invalid free in NBDDeviceAssociate (bz       #1006505, bz #1006511)

    - Fix virsh block-commit abort (bz #1010056)

    - Fix snapshot restore when VM has disabled usb support       (bz #1011520)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- Fix snapshot restore when VM has disabled usb support     (bz #1011520)

    - Rebased to version 1.0.5.6

    - Fix blockjobinfo python API (bz #999077)

    - CVE-2013-4311: Insecure polkit usage (bz #1009539, bz       #1005332)

    - CVE-2013-4296: Invalid free memory stats (bz #1006173,       bz #1009667)

    - CVE-2013-4291: Supplementary groups handling (bz       #1006509, bz #1006511)

    - CVE-2013-5651: virBitmapParse out-of-bounds (bz       #1006493)

    - Fix virsh change-media with block disk type (bz       #951192)

    - Fix changing VNC listen address (bz #1006697)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- Rebased to version 0.10.2.8

    - CVE-2013-4311: Insecure polkit usage (bz #1009539, bz       #1005332)

    - CVE-2013-4296: Invalid free memory stats (bz #1006173,       bz #1009667)

    - CVE-2013-4291: Supplementary groups handling (bz       #1006509, bz #1006511)

    - Fix LXC container creation if selinux disabled (bz       #977114)

    - Fix virsh change-media with block disk type (bz       #951192)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

libvirt invokes the PolicyKit pkcheck utility to handle authorization.
A race condition was found in the way libvirt used this utility, allowing a local user to bypass intended PolicyKit authorizations or execute arbitrary commands with root privileges. (CVE-2013-4311)

Note: With this update, libvirt has been rebuilt to communicate with PolicyKit via a different API that is not vulnerable to the race condition. The polkit SLSA-2013:1270 advisory must also be installed to fix the CVE-2013-4311 issue.

An invalid free flaw was found in libvirtd's remoteDispatchDomainMemoryStats function. An attacker able to establish a read-only connection to libvirtd could use this flaw to crash libvirtd. (CVE-2013-4296)

This update also fixes the following bugs :

  - Prior to this update, the libvirtd daemon leaked memory     in the virCgroupMoveTask() function. A fix has been     provided which prevents libvirtd from incorrect     management of memory allocations.

  - Previously, the libvirtd daemon was accessing one byte     before the array in the virCgroupGetValueStr() function.
    This bug has been fixed and libvirtd now stays within     the array bounds.

  - When migrating, libvirtd leaked the migration URI     (Uniform Resource Identifier) on destination. A patch     has been provided to fix this bug and the migration URI     is now freed correctly.

  - Updating a network interface using     virDomainUpdateDeviceFlags API failed when a boot order     was set for that interface. The update failed even if     the boot order was set in the provided device XML. The     virDomainUpdateDeviceFlags API has been fixed to     correctly parse the boot order specification from the     provided device XML and updating network interfaces with     boot orders now works as expected.

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

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:1272 advisory.

    The libvirt library is 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.

    libvirt invokes the PolicyKit pkcheck utility to handle authorization. A     race condition was found in the way libvirt used this utility, allowing a     local user to bypass intended PolicyKit authorizations or execute arbitrary     commands with root privileges. (CVE-2013-4311)

    Note: With this update, libvirt has been rebuilt to communicate with     PolicyKit via a different API that is not vulnerable to the race condition.
    The polkit RHSA-2013:1270 advisory must also be installed to fix the     CVE-2013-4311 issue.

    An invalid free flaw was found in libvirtd's     remoteDispatchDomainMemoryStats function. An attacker able to establish a     read-only connection to libvirtd could use this flaw to crash libvirtd.
    (CVE-2013-4296)

    The CVE-2013-4296 issue was discovered by Daniel P. Berrange of Red Hat.

    This update also fixes the following bugs:

    * Prior to this update, the libvirtd daemon leaked memory in the     virCgroupMoveTask() function. A fix has been provided which prevents     libvirtd from incorrect management of memory allocations. (BZ#984556)

    * Previously, the libvirtd daemon was accessing one byte before the array     in the virCgroupGetValueStr() function. This bug has been fixed and     libvirtd now stays within the array bounds. (BZ#984561)

    * When migrating, libvirtd leaked the migration URI (Uniform Resource     Identifier) on destination. A patch has been provided to fix this bug and     the migration URI is now freed correctly. (BZ#984578)

    * Updating a network interface using virDomainUpdateDeviceFlags API failed     when a boot order was set for that interface. The update failed even if the     boot order was set in the provided device XML. The     virDomainUpdateDeviceFlags API has been fixed to correctly parse the boot     order specification from the provided device XML and updating network     interfaces with boot orders now works as expected. (BZ#1003934)

    Users of libvirt are advised to upgrade to these updated packages, which     contain backported patches to correct these issues. After installing the     updated packages, libvirtd will be restarted automatically.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

From Red Hat Security Advisory 2013:1272 :

Updated libvirt packages that fix two security issues and several bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The libvirt library is 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.

libvirt invokes the PolicyKit pkcheck utility to handle authorization.
A race condition was found in the way libvirt used this utility, allowing a local user to bypass intended PolicyKit authorizations or execute arbitrary commands with root privileges. (CVE-2013-4311)

Note: With this update, libvirt has been rebuilt to communicate with PolicyKit via a different API that is not vulnerable to the race condition. The polkit RHSA-2013:1270 advisory must also be installed to fix the CVE-2013-4311 issue.

An invalid free flaw was found in libvirtd's remoteDispatchDomainMemoryStats function. An attacker able to establish a read-only connection to libvirtd could use this flaw to crash libvirtd. (CVE-2013-4296)

The CVE-2013-4296 issue was discovered by Daniel P. Berrange of Red Hat.

This update also fixes the following bugs :

* Prior to this update, the libvirtd daemon leaked memory in the virCgroupMoveTask() function. A fix has been provided which prevents libvirtd from incorrect management of memory allocations. (BZ#984556)

* Previously, the libvirtd daemon was accessing one byte before the array in the virCgroupGetValueStr() function. This bug has been fixed and libvirtd now stays within the array bounds. (BZ#984561)

* When migrating, libvirtd leaked the migration URI (Uniform Resource Identifier) on destination. A patch has been provided to fix this bug and the migration URI is now freed correctly. (BZ#984578)

* Updating a network interface using virDomainUpdateDeviceFlags API failed when a boot order was set for that interface. The update failed even if the boot order was set in the provided device XML. The virDomainUpdateDeviceFlags API has been fixed to correctly parse the boot order specification from the provided device XML and updating network interfaces with boot orders now works as expected.
(BZ#1003934)

Users of libvirt are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, libvirtd will be restarted automatically.

Updated libvirt packages that fix two security issues and several bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The libvirt library is 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.

libvirt invokes the PolicyKit pkcheck utility to handle authorization.
A race condition was found in the way libvirt used this utility, allowing a local user to bypass intended PolicyKit authorizations or execute arbitrary commands with root privileges. (CVE-2013-4311)

Note: With this update, libvirt has been rebuilt to communicate with PolicyKit via a different API that is not vulnerable to the race condition. The polkit RHSA-2013:1270 advisory must also be installed to fix the CVE-2013-4311 issue.

An invalid free flaw was found in libvirtd's remoteDispatchDomainMemoryStats function. An attacker able to establish a read-only connection to libvirtd could use this flaw to crash libvirtd. (CVE-2013-4296)

The CVE-2013-4296 issue was discovered by Daniel P. Berrange of Red Hat.

This update also fixes the following bugs :

* Prior to this update, the libvirtd daemon leaked memory in the virCgroupMoveTask() function. A fix has been provided which prevents libvirtd from incorrect management of memory allocations. (BZ#984556)

* Previously, the libvirtd daemon was accessing one byte before the array in the virCgroupGetValueStr() function. This bug has been fixed and libvirtd now stays within the array bounds. (BZ#984561)

* When migrating, libvirtd leaked the migration URI (Uniform Resource Identifier) on destination. A patch has been provided to fix this bug and the migration URI is now freed correctly. (BZ#984578)

* Updating a network interface using virDomainUpdateDeviceFlags API failed when a boot order was set for that interface. The update failed even if the boot order was set in the provided device XML. The virDomainUpdateDeviceFlags API has been fixed to correctly parse the boot order specification from the provided device XML and updating network interfaces with boot orders now works as expected.
(BZ#1003934)

Users of libvirt are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, libvirtd will be restarted automatically.

It was discovered that libvirt used the pkcheck tool in an unsafe manner. A local attacker could possibly use this flaw to bypass polkit authentication. In Ubuntu, libvirt polkit authentication is not enabled by default. (CVE-2013-4311)

It was discovered that libvirt incorrectly handled certain memory stats requests. A remote attacker could use this issue to cause libvirt to crash, resulting in a denial of service. This issue only affected Ubuntu 12.04 LTS, Ubuntu 12.10, and Ubuntu 13.04.
(CVE-2013-4296)

It was discovered that libvirt incorrectly handled certain bitmap operations. A remote attacker could use this issue to cause libvirt to crash, resulting in a denial of service. This issue only affected Ubuntu 13.04. (CVE-2013-5651).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
78977	RHEL 6 : rhev-hypervisor6 (RHSA-2013:1460)	Nessus	Red Hat Local Security Checks	high
76271	GLSA-201406-27 : polkit, Spice-Gtk, systemd, HPLIP, libvirt: Privilege escalation	Nessus	Gentoo Local Security Checks	high
75169	openSUSE Security Update : libvirt (openSUSE-SU-2013:1549-1)	Nessus	SuSE Local Security Checks	medium
75168	openSUSE Security Update : libvirt (openSUSE-SU-2013:1550-1)	Nessus	SuSE Local Security Checks	medium
70797	SuSE 11.3 Security Update : libvirt (SAT Patch Number 8421)	Nessus	SuSE Local Security Checks	medium
70408	Fedora 20 : libvirt-1.1.3-2.fc20 (2013-18455)	Nessus	Fedora Local Security Checks	medium
70279	Fedora 19 : libvirt-1.0.5.6-2.fc19 (2013-17618)	Nessus	Fedora Local Security Checks	medium
70235	Fedora 18 : libvirt-0.10.2.8-1.fc18 (2013-17305)	Nessus	Fedora Local Security Checks	medium
70015	Scientific Linux Security Update : libvirt on SL6.x i386/x86_64 (20130919)	Nessus	Scientific Linux Local Security Checks	medium
70011	RHEL 6 : libvirt (RHSA-2013:1272)	Nessus	Red Hat Local Security Checks	high
70007	Oracle Linux 6 : libvirt (ELSA-2013-1272)	Nessus	Oracle Linux Local Security Checks	medium
69999	CentOS 6 : libvirt (CESA-2013:1272)	Nessus	CentOS Local Security Checks	medium
69972	Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.04 : libvirt vulnerabilities (USN-1954-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2013-4311

high

Tenable Plugins

high

high

medium

medium

medium

medium

medium

medium

medium

high

medium

medium

medium