CVE-2015-4106

Matt Tait discovered that QEMU incorrectly handled the virtual PCNET driver. A malicious guest could use this issue to cause a denial of service, or possibly execute arbitrary code on the host as the user running the QEMU process (CVE-2015-3209).

Kurt Seifried discovered that QEMU incorrectly handled certain temporary files. A local attacker could use this issue to cause a denial of service (CVE-2015-4037).

Jan Beulich discovered that the QEMU Xen code incorrectly restricted write access to the host MSI message data field. A malicious guest could use this issue to cause a denial of service (CVE-2015-4103).

Jan Beulich discovered that the QEMU Xen code incorrectly restricted access to the PCI MSI mask bits. A malicious guest could use this issue to cause a denial of service (CVE-2015-4104).

Jan Beulich discovered that the QEMU Xen code incorrectly handled MSI-X error messages. A malicious guest could use this issue to cause a denial of service (CVE-2015-4105).

Jan Beulich discovered that the QEMU Xen code incorrectly restricted write access to the PCI config space. A malicious guest could use this issue to cause a denial of service, obtain sensitive information, or possibly execute arbitrary code (CVE-2015-4106).

A heap buffer overflow flaw was found in the way QEMU's IDE subsystem handled I/O buffer access while processing certain ATAPI commands. A privileged guest user in a guest with the CDROM drive enabled could potentially use this flaw to execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest (CVE-2015-5154).

An out-of-bounds memory access flaw, leading to memory corruption or possibly an information leak, was found in QEMU's pit_ioport_read() function. A privileged guest user in a QEMU guest, which had QEMU PIT emulation enabled, could potentially, in rare cases, use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process (CVE-2015-3214).

Qemu emulator built with the virtio-serial vmchannel support is vulnerable to a buffer overflow issue. It could occur while exchanging virtio control messages between guest & the host. A malicious guest could use this flaw to corrupt few bytes of Qemu memory area, potentially crashing the Qemu process (CVE-2015-5745).

This xen update is based on upstream 4.5.2 maintenance release, and fixes the following security issues:

The vgic_v2_to_sgi function in arch/arm/vgic-v2.c in Xen 4.5.x, when running on ARM hardware with general interrupt controller (GIC) version 2, allows local guest users to cause a denial of service (host crash) by writing an invalid value to the GICD.SGIR register (CVE-2015-0268).

The ARM GIC distributor virtualization in Xen 4.4.x and 4.5.x allows local guests to cause a denial of service by causing a large number messages to be logged (CVE-2015-1563).

The emulation routines for unspecified X86 devices in Xen 3.2.x through 4.5.x does not properly initialize data, which allow local HVM guest users to obtain sensitive information via vectors involving an unsupported access size (CVE-2015-2044).

The HYPERVISOR_xen_version hypercall in Xen 3.2.x through 4.5.x does not properly initialize data structures, which allows local guest users to obtain sensitive information via unspecified vectors (CVE-2015-2045).

Xen 3.3.x through 4.5.x and the Linux kernel through 3.19.1 do not properly restrict access to PCI command registers, which might allow local guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response (CVE-2015-2150).

The x86 emulator in Xen 3.2.x through 4.5.x does not properly ignore segment overrides for instructions with register operands, which allows local guest users to obtain sensitive information, cause a denial of service (memory corruption), or possibly execute arbitrary code via unspecified vectors (CVE-2015-2151).

Xen 4.5.x and earlier enables certain default backends when emulating a VGA device for an x86 HVM guest qemu even when the configuration disables them, which allows local guest users to obtain access to the VGA console by (1) setting the DISPLAY environment variable, when compiled with SDL support, or connecting to the VNC server on (2) ::1 or (3) 127.0.0.1, when not compiled with SDL support (CVE-2015-2152).

Xen 4.3.x, 4.4.x, and 4.5.x, when using toolstack disaggregation, allows remote domains with partial management control to cause a denial of service (host lock) via unspecified domctl operations (CVE-2015-2751).

The XEN_DOMCTL_memory_mapping hypercall in Xen 3.2.x through 4.5.x, when using a PCI passthrough device, is not preemptable, which allows local x86 HVM domain users to cause a denial of service (host CPU consumption) via a crafted request to the device model (qemu-dm) (CVE-2015-2752).

QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response (CVE-2015-2756).

Heap-based buffer overflow in the PCNET controller in QEMU allows remote attackers to execute arbitrary code by sending a packet with TXSTATUS_STARTPACKET set and then a crafted packet with TXSTATUS_DEVICEOWNS set (CVE-2015-3209).

Stack-based buffer overflow in the xl command line utility in Xen 4.1.x through 4.5.x allows local guest administrators to gain privileges via a long configuration argument (CVE-2015-3259).

Xen 4.2.x through 4.5.x does not initialize certain fields, which allows 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).

The Floppy Disk Controller (FDC) in QEMU, as used in Xen 4.5.x and earlier and KVM, allows local guest users to cause a denial of service (out-of-bounds write and guest crash) or possibly execute arbitrary code via the (1) FD_CMD_READ_ID, (2) FD_CMD_DRIVE_SPECIFICATION_COMMAND, or other…

These are all security issues fixed in the xen-4.7.0_12-1.3 package on the GA media of openSUSE Tumbleweed.

Xen was updated to fix seven security issues and one non-security bug.

The following vulnerabilities were fixed:

• CVE-2015-4103: Potential unintended writes to host MSI message data field via qemu (XSA-128) (bnc#931625)
• CVE-2015-4104: PCI MSI mask bits inadvertently exposed to guests (XSA-129) (bnc#931626)
• CVE-2015-4105: Guest triggerable qemu MSI-X pass-through error messages (XSA-130) (bnc#931627)
• CVE-2015-4106: Unmediated PCI register access in qemu (XSA-131) (bnc#931628)
• CVE-2015-4163: GNTTABOP_swap_grant_ref operation misbehavior (XSA-134) (bnc#932790)
• CVE-2015-3209: heap overflow in qemu pcnet controller allowing guest to host escape (XSA-135) (bnc#932770)
• CVE-2015-4164: DoS through iret hypercall handler (XSA-136) (bnc#932996)

The following non-security bug was fixed:

• bnc#906689: let systemd schedule xencommons after network-online.target and remote-fs.target so that xendomains has access to remote shares

Xen was updated to fix seven security vulnerabilities:

* CVE-2015-4103: Potential unintended writes to host MSI message data
  field via qemu. (XSA-128, bnc#931625)
* CVE-2015-4104: PCI MSI mask bits inadvertently exposed to guests.
  (XSA-129, bnc#931626)
* CVE-2015-4105: Guest triggerable qemu MSI-X pass-through error
  messages. (XSA-130, bnc#931627)
* CVE-2015-4106: Unmediated PCI register access in qemu. (XSA-131,
  bnc#931628)
* CVE-2015-4163: GNTTABOP_swap_grant_ref operation misbehavior.
  (XSA-134, bnc#932790)
* CVE-2015-3209: Heap overflow in qemu pcnet controller allowing guest
  to host escape. (XSA-135, bnc#932770)
* CVE-2015-4164: DoS through iret hypercall handler. (XSA-136,
  bnc#932996)

Security Issues:

* CVE-2015-4103
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4103>
* CVE-2015-4104
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4104>
* CVE-2015-4105
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4105>
* CVE-2015-4106
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4106>
* CVE-2015-4163
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4163>
* CVE-2015-4164
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4164>
* CVE-2015-3209
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3209>

Xen was updated to fix six security issues:

* CVE-2015-4103: Potential unintended writes to host MSI message data
  field via qemu. (XSA-128, bsc#931625)
* CVE-2015-4104: PCI MSI mask bits inadvertently exposed to guests.
  (XSA-129, bsc#931626)
* CVE-2015-4105: Guest triggerable qemu MSI-X pass-through error
  messages. (XSA-130, bsc#931627)
* CVE-2015-4106: Unmediated PCI register access in qemu. (XSA-131,
  bsc#931628)
* CVE-2015-3209: heap overflow in qemu pcnet controller allowing guest
  to host escape. (XSA-135, bsc#932770)
* CVE-2015-4164: DoS through iret hypercall handler. (XSA-136,
  bsc#932996)

Security Issues:

* CVE-2015-4103
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4103>
* CVE-2015-4104
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4104>
* CVE-2015-4105
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4105>
* CVE-2015-4106
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4106>
* CVE-2015-4164
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4164>
* CVE-2015-3209
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3209>

Xen was updated to fix six security issues:

* CVE-2015-4103: Potential unintended writes to host MSI message data
  field via qemu. (XSA-128, bsc#931625)
* CVE-2015-4104: PCI MSI mask bits inadvertently exposed to guests.
  (XSA-129, bsc#931626)
* CVE-2015-4105: Guest triggerable qemu MSI-X pass-through error
  messages. (XSA-130, bsc#931627)
* CVE-2015-4106: Unmediated PCI register access in qemu. (XSA-131,
  bsc#931628)
* CVE-2015-3209: Heap overflow in qemu pcnet controller allowing guest
  to host escape. (XSA-135, bsc#932770)
* CVE-2015-4164: DoS through iret hypercall handler. (XSA-136,
  bsc#932996)

Security Issues:

* CVE-2015-4103
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4103>
* CVE-2015-4104
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4104>
* CVE-2015-4105
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4105>
* CVE-2015-4106
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4106>
* CVE-2015-4163
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4163>
* CVE-2015-4164
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4164>
* CVE-2015-3209
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3209>

This update fixes the following security issues:

• bsc#956832 - CVE-2015-8345: xen: qemu: net: eepro100: infinite loop in processing command block list

• Revert x86/IO-APIC: don't create pIRQ mapping from masked RTE until kernel maintenance release goes out.

• bsc#956592 - xen: virtual PMU is unsupported (XSA-163)

• bsc#956408 - CVE-2015-8339, CVE-2015-8340: xen: XENMEM_exchange error handling issues (XSA-159)

• bsc#956409 - CVE-2015-8341: xen: libxl leak of pv kernel and initrd on error (XSA-160)

• bsc#956411 - CVE-2015-7504: xen: heap buffer overflow vulnerability in pcnet emulator (XSA-162)

• bsc#947165 - CVE-2015-7311: xen: libxl fails to honour readonly flag on disks with qemu-xen (xsa-142)

• bsc#954405 - CVE-2015-8104: Xen: guest to host DoS by triggering an infinite loop in microcode via #DB exception

• bsc#954018 - CVE-2015-5307: xen: x86: CPU lockup during fault delivery (XSA-156)

QEMU does not properly restrict write access to the PCI config space for certain PCI pass-through devices, which might allow local x86 HVM guests to gain privileges, cause a denial of service (host crash), obtain sensitive information, or possibly have other unspecified impact via unknown vectors.

Matt Tait discovered that QEMU incorrectly handled the virtual PCNET driver. A malicious guest could use this issue to cause a denial of service, or possibly execute arbitrary code on the host as the user running the QEMU process. In the default installation, when QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile. (CVE-2015-3209)

Kurt Seifried discovered that QEMU incorrectly handled certain temporary files. A local attacker could use this issue to cause a denial of service. (CVE-2015-4037)

Jan Beulich discovered that the QEMU Xen code incorrectly restricted write access to the host MSI message data field. A malicious guest could use this issue to cause a denial of service. This issue only applied to Ubuntu 14.04 LTS, Ubuntu 14.10 and Ubuntu 15.04. (CVE-2015-4103)

Jan Beulich discovered that the QEMU Xen code incorrectly restricted access to the PCI MSI mask bits. A malicious guest could use this issue to cause a denial of service. This issue only applied to Ubuntu 14.04 LTS, Ubuntu 14.10 and Ubuntu 15.04. (CVE-2015-4104)

Jan Beulich discovered that the QEMU Xen code incorrectly handled MSI-X error messages. A malicious guest could use this issue to cause a denial of service. This issue only applied to Ubuntu 14.04 LTS, Ubuntu 14.10 and Ubuntu 15.04. (CVE-2015-4105)

Jan Beulich discovered that the QEMU Xen code incorrectly restricted write access to the PCI config space. A malicious guest could use this issue to cause a denial of service, obtain sensitive information, or possibly execute arbitrary code. This issue only applied to Ubuntu 14.04 LTS, Ubuntu 14.10 and Ubuntu 15.04. (CVE-2015-4106)