Updated kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 5.

Red Hat Product Security 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.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems.

An out-of-bounds memory access flaw was found in the way QEMU's virtual Floppy Disk Controller (FDC) handled FIFO buffer access while processing certain FDC commands. A privileged guest user could use this flaw to crash the guest or, potentially, execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest. (CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting this issue.

All kvm users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. Note: The procedure in the Solution section must be performed before this update will take effect.

Several vulnerabilities were discovered in the qemu virtualisation solution :

  - CVE-2014-9718     It was discovered that the IDE controller emulation is     susceptible to denial of service.

  - CVE-2015-1779     Daniel P. Berrange discovered a denial of service     vulnerability in the VNC web socket decoder.

  - CVE-2015-2756     Jan Beulich discovered that unmediated PCI command     register could result in denial of service.

  - CVE-2015-3456     Jason Geffner discovered a buffer overflow in the     emulated floppy disk drive, resulting in the potential     execution of arbitrary code.

Updated qemu-kvm packages that fix one security issue are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security 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.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm package provides the user-space component for running virtual machines using KVM.

An out-of-bounds memory access flaw was found in the way QEMU's virtual Floppy Disk Controller (FDC) handled FIFO buffer access while processing certain FDC commands. A privileged guest user could use this flaw to crash the guest or, potentially, execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest. (CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting this issue.

All qemu-kvm users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

The remote Oracle Linux 5 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2015-1002 advisory.

    [3.0.3-146.el5]
    - xen-fdc-force-the-fifo-access-to-be-in-bounds-of-the-all.patch
    - xen-FDC-Fix-buffer-overflow-Herv-Poussineau.patch
    - Resolves: bz#1219333      (xen: qemu: floppy disk controller flaw [rhel-5.11.z])

    [3.0.3-144.el5]
    - xm: Fix vcpu-pin complain for CPU number out of range (rhbz 955656)
    - libxc: Support set affinity for more than 64 CPUS (rhbz 955656)
    - libxc: Fixes for 'support affinity for more than 64 CPUS' (rhbz 955656)
    - xend: Fix bug of a cpu affinity vcpu-pin under ia32pa (rhbz 955656)
    - libxc: Fix cpu number overflow for vcpu-pin (rhbz 955656)

    [3.0.3-143.el5]
    - libxc: move error checking next to the function which returned the error (rhbz 870413)
    - libxc: builder: limit maximum size of   kernel/ramdisk (rhbz 870413)
    - e1000: discard packets that are too long if !SBP and !LPE (rhbz 910844)
    - e1000: discard oversized packets based on SBP|LPE (rhbz 910844)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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

The remote OracleVM system is missing necessary patches to address critical security updates :

  - force the fifo access to be in bounds of the allocated     buffer This is XSA-133. [bug 21078975] (CVE-2015-3456)

Qemu was updated to v2.1.3: See http://wiki.qemu-project.org/ChangeLog/2.1 for more information.

This update includes a security fix :

  - CVE-2015-3456: Fixed a buffer overflow in the floppy     drive emulation, which could be used to denial of     service attacks or potential code execution against the     host.

Xen was updated to fix two security issues and a bug :

CVE-2015-3456: A buffer overflow in the floppy drive emulation, which could be used to carry out denial of service attacks or potential code execution against the host. This vulnerability is also known as VENOM.

CVE-2015-3340: Xen did not initialize certain fields, which allowed certain remote service domains to obtain sensitive information from memory via a (1) XEN_DOMCTL_gettscinfo or (2) XEN_SYSCTL_getdomaininfolist request.

An exception in setCPUAffinity when restoring guests. (bsc#910441)

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

The XEN hypervisor was updated to fix two security issues :

  - Fixed a buffer overflow in the floppy drive emulation,     which could be used to denial of service attacks or     potential code execution against the host.
    (CVE-2015-3456)

  - Xen did not initialize certain fields, which allowed     certain remote service domains to obtain sensitive     information from memory via a (1) XEN_DOMCTL_gettscinfo     or (2) XEN_SYSCTL_getdomaininfolist request.
    (CVE-2015-3340)

A vulnerability was discovered in the qemu virtualisation solution :

CVE-2015-3456

Jason Geffner discovered a buffer overflow in the emulated floppy disk drive, resulting in the potential execution of arbitrary code.

Despite the end-of-life of qemu support in the old-oldstable distribution (squeeze-lts), this problem has been fixed in version 0.12.5+dfsg-3squeeze4 of the qemu source package due to its severity (the so-called VENOM vulnerability).

Further problems may still be present in the qemu package in the old-oldstable distribution (squeeze-lts) and users who need to rely on qemu are encouraged to upgrade to a newer version of Debian.

We recommend that you upgrade your qemu packages.

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

A vulnerability was discovered in the qemu virtualisation solution :

CVE-2015-3456

Jason Geffner discovered a buffer overflow in the emulated floppy disk drive, resulting in the potential execution of arbitrary code.

Despite the end-of-life of qemu-kvm support in the old-oldstable distribution (squeeze-lts), this problem has been fixed in version 0.12.5+dfsg-5+squeeze11 of the qemu-kvm source package due to its severity (the so-called VENOM vulnerability).

Further problems may still be present in the qemu-kvm package in the old-oldstable distribution (squeeze-lts) and users who need to rely on qemu-kvm are encouraged to upgrade to a newer version of Debian.

We recommend that you upgrade your qemu-kvm packages.

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

ID	Name	Product	Family	Published	Updated	Severity
83421	CentOS 5 : kvm (CESA-2015:1003) (Venom)	Nessus	CentOS Local Security Checks	5/13/2015	9/28/2023	high
83422	Debian DSA-3259-1 : qemu - security update (Venom)	Nessus	Debian Local Security Checks	5/13/2015	9/28/2023	high
83426	RHEL 7 : qemu-kvm (RHSA-2015:0999) (Venom)	Nessus	Red Hat Local Security Checks	5/13/2015	9/28/2023	high
83446	Oracle Linux 5 : xen (ELSA-2015-1002)	Nessus	Oracle Linux Local Security Checks	5/14/2015	10/22/2024	critical
83484	OracleVM 2.2 : xen (OVMSA-2015-0059) (Venom)	Nessus	OracleVM Local Security Checks	5/15/2015	1/4/2021	high
83534	openSUSE Security Update : qemu (openSUSE-2015-364) (Venom)	Nessus	SuSE Local Security Checks	5/19/2015	9/28/2023	high
83853	SUSE SLED11 / SLES11 Security Update : Xen (SUSE-SU-2015:0927-1) (Venom)	Nessus	SuSE Local Security Checks	5/27/2015	1/6/2021	high
83965	openSUSE Security Update : xen (openSUSE-2015-391) (Venom)	Nessus	SuSE Local Security Checks	6/3/2015	1/19/2021	high
84294	Debian DLA-248-1 : qemu security update (Venom)	Nessus	Debian Local Security Checks	6/22/2015	1/11/2021	high
84295	Debian DLA-249-1 : qemu-kvm security update (Venom)	Nessus	Debian Local Security Checks	6/22/2015	1/11/2021	high

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