Buffer overflow in the SCSI implementation in QEMU, as used in Xen, when a SCSI controller has more than 256 attached devices, allows local users to gain privileges via a small transfer buffer in a REPORT LUNS command.

Updated qemu-kvm packages that fix one security issue, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 6.

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.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems that is built into the standard Red Hat Enterprise Linux kernel. The qemu-kvm packages form the user-space component for running virtual machines using KVM.

A buffer overflow flaw was found in the way QEMU processed the SCSI 'REPORT LUNS' command when more than 256 LUNs were specified for a single SCSI target. A privileged guest user could use this flaw to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2013-4344)

This issue was discovered by Asias He of Red Hat.

These updated qemu-kvm packages include numerous bug fixes and various enhancements. Space precludes documenting all of these changes in this advisory. Users are directed to the Red Hat Enterprise Linux 6.5 Technical Notes, linked to in the References, for information on the most significant of these changes.

All qemu-kvm users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add these enhancements. 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.

Updated qemu-kvm-rhev, qemu-kvm-rhev-tools, and qemu-img-rhev packages are 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.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the user-space component for running virtual machines using KVM, in environments managed by Red Hat Enterprise Virtualization Manager.

A buffer overflow flaw was found in the way QEMU processed the SCSI 'REPORT LUNS' command when more than 256 LUNs were specified for a single SCSI target. A privileged guest user could use this flaw to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2013-4344)

This issue was discovered by Asias He of Red Hat.

This update fixes the following bugs :

* In QMP monitor, if an attempt was made to create an image with the same file name as the backing file, an error was generated, but no message was displayed. Performing this action in QMP Monitor now generates the same error message as performing the action in HMP:
'Error: Trying to create an image with the same file name as the backing file'. (BZ#877240)

* QEMU I/O throttling has been disabled in Red Hat Enterprise Linux and is now only available enabled in the Red Hat Enterprise Virtualization QEMU package (qemu-kvm-rhev). (BZ#975468)

* When booting a guest machine, it would still boot when specifying iops and bps as a negative value, without displaying an error message.
This has been fixed so that if a negative value is used the guest does not boot and QEMU exits with the following message 'bps and iops values must be 0 or greater'. (BZ#987725)

* When booting a guest with QMP server, hot plug was failing. It can now do hotplug with QEMU I/O throttling including iops, iops_wr, iops_rd, bps, bps_wr, bps_rd inofs successfully. (BZ#987745)

* Due to a change in virtualization features, all fixes and errata related to Red Hat Enterprise Virtualization specific features, can only be posted to the Red Hat Enterprise Virtualization channel.
Therefore a Red Hat Enterprise Virtualization specific qemu-kvm (for RHEV-H-6.5.0 Errata) was developed. This meant that the qemu-kvm-rhev binary was mapped to a Red Had enterprise Virtualization channel, entitled to Red Hat Enterprise Virtualization customers, and disabled from the Red Hat Enterprise Linux channel. (BZ#997032)

* The qemu-kvm-rhev package now contains /usr/lib64/qemu, as this directory is where CEPH packages provide librbd to be used by QEMU at runtime. (BZ#999705)

* QEMU performed a core dump when iops.bps was set to a negative value. This has been fixed so that it no longer performs a core dump when a negative value is entered, instead an error message is displayed indicating the values must be zero of greater. (BZ#1001436)

* When running the 'rpm -V qemu-kvm-rhev' command, an error was generated stating there were unsatisfied dependencies. This has been fixed so there now are no unsatisfied dependencies and it executes correctly. (BZ#1010930)

In addition, this update adds the following enhancements :

* QEMU I/O throttling allows for finer control of the rate of I/O operations at the QEMU level, and is therefore independent of the underlying storage device. A similar feature can be created by using cgroups at the libvirt level, but cgroups is limited as it does not support some storage devices (such as image files over NFS) and throttles the whole virtual machine, including access to meta-data, while qemu I/O is more fine-grained. (BZ#956825)

* Patches were added to the QEMU block driver for accessing CEPH storage on qemu-kvm-rhev. However,this is not usable on its own, a librbd library still needs to be provided. The librbd library is not provided in Red Hat Enterprise Linux and will be handled by a third party source. (BZ#988079)

The remote Redhat Enterprise Linux 6 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2013:1527 advisory.

    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 buffer overflow flaw was found in the way QEMU processed the SCSI REPORT     LUNS command when more than 256 LUNs were specified for a single SCSI     target. A privileged guest user could use this flaw to corrupt QEMU process     memory on the host, which could potentially result in arbitrary code     execution on the host with the privileges of the QEMU process.
    (CVE-2013-4344)

    Multiple flaws were found in the way Linux kernel handled HID (Human     Interface Device) reports. An attacker with physical access to the system     could use this flaw to crash the system or, potentially, escalate their     privileges on the system. (CVE-2013-2888, CVE-2013-2889, CVE-2013-2892)

    A flaw was found in the way the Python SSL module handled X.509 certificate     fields that contain a NULL byte. An attacker could potentially exploit this     flaw to conduct man-in-the-middle attacks to spoof SSL servers. Note that     to exploit this issue, an attacker would need to obtain a carefully crafted     certificate signed by an authority that the client trusts. (CVE-2013-4238)

    The default OpenSSH configuration made it easy for remote attackers to     exhaust unauthorized connection slots and prevent other users from being     able to log in to a system. This flaw has been addressed by enabling random     early connection drops by setting MaxStartups to 10:30:100 by default.
    For more information, refer to the sshd_config(5) man page. (CVE-2010-5107)

    The CVE-2013-4344 issue was discovered by Asias He 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-2012-0786 and CVE-2012-0787 (augeas issues)

    CVE-2013-1813 (busybox issue)

    CVE-2013-0221, CVE-2013-0222, and CVE-2013-0223 (coreutils issues)

    CVE-2012-4453 (dracut issue)

    CVE-2013-4332, CVE-2013-0242, and CVE-2013-1914 (glibc issues)

    CVE-2013-4387, CVE-2013-0343, CVE-2013-4345, CVE-2013-4591, CVE-2013-4592,     CVE-2012-6542, CVE-2013-3231, CVE-2013-1929, CVE-2012-6545, CVE-2013-1928,     CVE-2013-2164, CVE-2013-2234, and CVE-2013-2851 (kernel issues)

    CVE-2013-4242 (libgcrypt issue)

    CVE-2013-4419 (libguestfs issue)

    CVE-2013-1775, CVE-2013-2776, and CVE-2013-2777 (sudo issues)

    This update also fixes the following bug:

    * A previous version of the rhev-hypervisor6 package did not contain the     latest vhostmd package, which provides a metrics communication channel     between a host and its hosted virtual machines, allowing limited     introspection of host resource usage from within virtual machines. This has     been fixed, and rhev-hypervisor6 now includes the latest vhostmd package.
    (BZ#1026703)

    This update also contains the fixes from the following errata:

    * ovirt-node: https://rhn.redhat.com/errata/RHBA-2013-1528.html

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

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.

The SUSE Linux Enterprise 11 Service Pack 3 Xen package was updated to fix various bugs and security issues.

The following security issues have been fixed :

  - XSA-108: CVE-2014-7188: Improper MSR range used for     x2APIC emulation. (bnc#897657)

  - XSA-106: CVE-2014-7156: Missing privilege level checks     in x86 emulation of software interrupts. (bnc#895802)

  - XSA-105: CVE-2014-7155: Missing privilege level checks     in x86 HLT, LGDT, LIDT, and LMSW emulation. (bnc#895799)

  - XSA-104: CVE-2014-7154: Race condition in     HVMOP_track_dirty_vram. (bnc#895798)

  - XSA-100: CVE-2014-4021: Hypervisor heap contents leaked     to guests. (bnc#880751)

  - XSA-96: CVE-2014-3967 / CVE-2014-3968: Vulnerabilities     in HVM MSI injection. (bnc#878841)

  - XSA-89: CVE-2014-2599: HVMOP_set_mem_access is not     preemptible. (bnc#867910)

  - XSA-65: CVE-2013-4344: qemu SCSI REPORT LUNS buffer     overflow. (bnc#842006)

  - qemu: zaurus: buffer overrun on invalid state load     (bnc#864801) The following non-security issues have been     fixed:. (CVE-2013-4540)

  - xend: Fix netif convertToDeviceNumber for running     domains. (bnc#891539)

  - Installing SLES12 as a VM on SLES11 SP3 fails because of     btrfs in the VM. (bnc#882092)

  - XEN kernel panic do_device_not_available(). (bnc#881900)

  - Boot Failure with xen kernel in UEFI mode with error 'No     memory for trampoline'. (bnc#833483)

  - SLES 11 SP3 vm-install should get RHEL 7 support when     released. (bnc#862608)

  - SLES 11 SP3 XEN kiso version cause softlockup on 8     blades npar(480 cpu). (bnc#858178)

  - Local attach support for PHY backends using scripts     local_attach_support_for_phy.patch. (bnc#865682)

  - Improve multipath support for npiv devices block-npiv     (bnc#798770)

XEN was updated to fix security issues and bugs.

Security issues fixed :

  - bnc#897657 - CVE-2014-7188: XSA-108 Improper MSR range     used for x2APIC emulation

  - bnc#895802 - CVE-2014-7156: XSA-106: Missing privilege     level checks in x86 emulation of software interrupts

  - bnc#895799 - CVE-2014-7155: XSA-105: Missing privilege     level checks in x86 HLT, LGDT, LIDT, and LMSW emulation

  - bnc#895798 - CVE-2014-7154: XSA-104: Race condition in     HVMOP_track_dirty_vram

  - bnc#864801 - CVE-2013-4540: qemu: zaurus: buffer overrun     on invalid state load

  - bnc#875668 - CVE-2014-3124: XSA-92: HVMOP_set_mem_type     allows invalid P2M entries to be created

  - bnc#878841 - CVE-2014-3967, CVE-2014-3968: XSA-96: Xen:
    Vulnerabilities in HVM MSI injection

  - bnc#880751 - CVE-2014-4021: XSA-100: Hypervisor heap     contents leaked to guests

  - bnc#842006 - CVE-2013-4344: XSA-65: xen: qemu SCSI     REPORT LUNS buffer overflow 

Other bugs fixed :

  - bnc#896023 - Adjust xentop column layout

  - bnc#820873 - The 'long' option doesn't work with 'xl     list'

  - bnc#882127 - Xen kernel panics on booting SLES12 Beta 8

  - bnc#865682 - Local attach support for PHY backends using     scripts

  - bnc#798770 - Improve multipath support for npiv devices

XEN was updated to fix various bugs and security issues.

Security issues fixed :

  - bnc#897657 - CVE-2014-7188: XSA-108 Improper MSR range     used for x2APIC emulation

  - bnc#895802 - CVE-2014-7156: XSA-106: Missing privilege     level checks in x86 emulation of software interrupts

  - bnc#895799 - CVE-2014-7155: XSA-105: Missing privilege     level checks in x86 HLT, LGDT, LIDT, and LMSW emulation

  - bnc#895798 - CVE-2014-7154: XSA-104: Race condition in     HVMOP_track_dirty_vram

  - bnc#864801 - CVE-2013-4540: qemu: zaurus: buffer overrun     on invalid state load 

  - bnc#880751 - CVE-2014-4021: XSA-100: Hypervisor heap     contents leaked to guests

  - bnc#878841 - CVE-2014-3967,CVE-2014-3968: XSA-96:
    Vulnerabilities in HVM MSI injection

  - bnc#867910 - CVE-2014-2599: XSA-89: HVMOP_set_mem_access     is not preemptible

  - bnc#842006 - CVE-2013-4344: XSA-65: xen: qemu SCSI     REPORT LUNS buffer overflow

Other bugs fixed :

  - bnc#896023 - Adjust xentop column layout

  - bnc#891539 - xend: fix netif convertToDeviceNumber for     running domains

  - bnc#820873 - The 'long' option doesn't work with 'xl     list'

  - bnc#881900 - XEN kernel panic do_device_not_available()

  - bnc#833483 - Boot Failure with xen kernel in UEFI mode     with error 'No memory for trampoline'

  - bnc#862608 - SLES 11 SP3 vm-install should get RHEL 7     support when released

  - bnc#858178 - [HP HPS Bug]: SLES11sp3 XEN kiso version     cause softlockup on 8 blades npar(480 cpu)

  - bnc#865682 - Local attach support for PHY backends using     scripts

  - bnc#798770 - Improve multipath support for npiv devices

Running QEMU in a configuration with more than 256 emulated SCSI devices attached could have caused a buffer overflow when the guest issues a REPORT LUNS command. Fix this as part of upgrading to the latest stable version on 13.1. Also fix unintentional building against gtk2 rather than gtk3 on 13.1, and fix serial retry logic on 12.3.

Several vulnerabilities were discovered in qemu-kvm, a full virtualization solution on x86 hardware.

  - CVE-2013-4344     Buffer overflow in the SCSI implementation in QEMU, when     a SCSI controller has more than 256 attached devices,     allows local users to gain privileges via a small     transfer buffer in a REPORT LUNS command.

  - CVE-2014-2894     Off-by-one error in the cmd_smart function in the smart     self test in hw/ide/core.c in QEMU allows local users to     have unspecified impact via a SMART EXECUTE OFFLINE     command that triggers a buffer underflow and memory     corruption.

Several vulnerabilities were discovered in qemu, a fast processor emulator.

  - CVE-2013-4344     Buffer overflow in the SCSI implementation in QEMU, when     a SCSI controller has more than 256 attached devices,     allows local users to gain privileges via a small     transfer buffer in a REPORT LUNS command.

  - CVE-2014-2894     Off-by-one error in the cmd_smart function in the smart     self test in hw/ide/core.c in QEMU allows local users to     have unspecified impact via a SMART EXECUTE OFFLINE     command that triggers a buffer underflow and memory     corruption.

The QEMU embedded within KVM received various security fixes.

Various issues in the block layer have been fixed :

  - A virtio security issue in config io space handling.
    (CVE-2013-2016)

  - A SCSI report LUNs buffer overflow. (CVE-2013-4344)

  - A buffer overflow in the QEMU USB stack. (CVE-2013-4541)

Asias He discovered that QEMU incorrectly handled SCSI controllers with more than 256 attached devices. A local user could possibly use this flaw to elevate privileges. (CVE-2013-4344)

It was discovered that QEMU incorrectly handled Xen disks. A local guest could possibly use this flaw to consume resources, resulting in a denial of service. This issue only affected Ubuntu 12.10 and Ubuntu 13.10. (CVE-2013-4375)

Sibiao Luo discovered that QEMU incorrectly handled device hot-unplugging. A local user could possibly use this flaw to cause a denial of service. This issue only affected Ubuntu 13.10.
(CVE-2013-4377).

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.

A buffer overflow flaw was found in the way QEMU processed the SCSI 'REPORT LUNS' command when more than 256 LUNs were specified for a single SCSI target. A privileged guest user could use this flaw to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2013-4344)

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 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2013-1553 advisory.

    - Resolves: bz#1007330       (CVE-2013-4344 qemu: buffer overflow in scsi_target_emulate_report_luns)

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.

- Fix migration from qemu <= 1.5

    - Rebase to pending 1.6.1 stable

    - CVE-2013-4377: Fix crash when unplugging virtio       devices (bz #1012633, bz #1012641)

    - Fix 'new snapshot' slowness after the first snap (bz       #988436)

    - Fix 9pfs xattrs on kernel 3.11 (bz #1013676)

    - CVE-2013-4344: buffer overflow in       scsi_target_emulate_report_luns (bz #1015274, bz       #1007330)

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.

- CVE-2013-4344: buffer overflow in     scsi_target_emulate_report_luns (bz #1015274, bz     #1007330)

    - Fix 9pfs xattrs on kernel 3.11 (bz #1013676)

    - Require newer ceph-libs to fix symbol error (bz       #995883)

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.

ID	Name	Product	Family	Severity
79161	CentOS 6 : qemu-kvm (CESA-2013:1553)	Nessus	CentOS Local Security Checks	high
78981	RHEL 6 : qemu-kvm-rhev, qemu-kvm-rhev-tools, qemu-img-rhev (RHSA-2013:1754)	Nessus	Red Hat Local Security Checks	high
78979	RHEL 6 : rhev-hypervisor6 (RHSA-2013:1527)	Nessus	Red Hat Local Security Checks	high
78652	SuSE 11.3 Security Update : Xen (SAT Patch Number 9828)	Nessus	SuSE Local Security Checks	high
78117	openSUSE Security Update : xen (openSUSE-SU-2014:1281-1)	Nessus	SuSE Local Security Checks	high
78116	openSUSE Security Update : xen (openSUSE-SU-2014:1279-1)	Nessus	SuSE Local Security Checks	high
75249	openSUSE Security Update : qemu (openSUSE-SU-2014:0200-1)	Nessus	SuSE Local Security Checks	medium
74096	Debian DSA-2933-1 : qemu-kvm - security update	Nessus	Debian Local Security Checks	high
74095	Debian DSA-2932-1 : qemu - security update	Nessus	Debian Local Security Checks	high
73939	SuSE 11.3 Security Update : kvm (SAT Patch Number 9142)	Nessus	SuSE Local Security Checks	high
72231	Ubuntu 12.04 LTS / 12.10 / 13.10 : qemu, qemu-kvm vulnerabilities (USN-2092-1)	Nessus	Ubuntu Local Security Checks	medium
71299	Scientific Linux Security Update : qemu-kvm on SL6.x i386/x86_64 (20131121)	Nessus	Scientific Linux Local Security Checks	high
71127	Oracle Linux 6 : qemu-kvm (ELSA-2013-1553)	Nessus	Oracle Linux Local Security Checks	critical
71004	RHEL 6 : qemu-kvm (RHSA-2013:1553)	Nessus	Red Hat Local Security Checks	high
70432	Fedora 20 : qemu-1.6.0-10.fc20 (2013-18715)	Nessus	Fedora Local Security Checks	medium
70430	Fedora 19 : qemu-1.4.2-12.fc19 (2013-18493)	Nessus	Fedora Local Security Checks	medium

Detections

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CVE-2013-4344

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