CVE-2015-7504

Heap-based buffer overflow in the pcnet_receive function in hw/net/pcnet.c in QEMU allows guest OS administrators to cause a denial of service (instance crash) or possibly execute arbitrary code via a series of packets in loopback mode.

A heap-based buffer overflow flaw was discovered in the way QEMU's AMD PC-Net II Ethernet Controller emulation received certain packets in loopback mode. A privileged user (with the CAP_SYS_RAWIO capability) inside a guest could use this flaw to crash the host QEMU process (resulting in denial of service) or, potentially, execute arbitrary code with privileges of the host QEMU process (CVE-2015-7504)

A buffer overflow flaw was found in the way QEMU's AMD PC-Net II emulation validated certain received packets from a remote host in non-loopback mode. A remote, unprivileged attacker could potentially use this flaw to execute arbitrary code on the host with the privileges of the QEMU process. Note that to exploit this flaw, the guest network interface must have a large MTU limit (CVE-2015-7512)

A NULL pointer dereference vulnerability was found in the QEMU emulator built with PCI MSI-X support. Because MSI-X MMIO support did not define the .write method, when the controller tried to write to the pending bit array(PBA) memory region, a segmentation fault occurred. A privileged attacker inside the guest could use this flaw to crash the QEMU process resulting in denial of service (CVE-2015-7549)

An infinite-loop flaw was discovered in the QEMU emulator built with i8255x (PRO100) emulation support. When processing a chain of commands located in the Command Block List(CBL), each Command Block(CB) points to the next command in the list. If the link to the next CB pointed to the same block or if there was a closed loop in the chain, an infinite loop would execute the same command over and over again. A privileged user inside the guest could use this flaw to crash the QEMU instance, resulting in denial of service (CVE-2015-8345).

An arithmetic-exception flaw was found in the QEMU emulator built with VNC display-driver support. The VNC server incorrectly handled 'SetPixelFormat' messages sent from clients. A privileged remote client could use this flaw to crash the guest resulting in denial of service (CVE-2015-8504).

An infinite-loop issue was found in the QEMU emulator built with USB EHCI emulation support. The flaw occurred during communication between the host controller interface(EHCI) and a respective device driver. These two communicate using an isochronous transfer descriptor list(iTD). an infinite loop unfolded if there was a closed loop in the list. A privileged user inside a guest could use this flaw to consume excessive resources and cause denial of service (CVE-2015-8558).

A memory-leak flaw was found in the QEMU emulator built with VMWARE VMXNET3 paravirtual NIC emulator support. The flaw occurred when a guest repeatedly tried to activate the VMXNET3 device. A privileged guest attacker could use this flaw to leak host memory, resulting in denial of service on the host. (CVE-2015-8567, CVE-2015-8568)

A stack buffer-overflow vulnerability has been discovered in the QEMU emulator built with SCSI MegaRAID SAS HBA emulation support. The flaw occurs when processing the SCSI controller's CTRL_GET_INFO command. A privileged guest user could exploit this flaw to crash the QEMU process instance (denial of service). (CVE-2015-8613)

An out-of-bounds write vulnerability has been found in the QEMU emulator built with Human Monitor Interface(HMP) support. The issue occurs when the 'sendkey' command (in hmp_sendkey) is processed with a 'keyname_len' that is greater than the 'keyname_buf' array size. A user or process could exploit this flaw to crash the QEMU process instance (denial of service). (CVE-2015-8619)

Qemu emulator built with the Q35 chipset based pc system emulator is vulnerable to a heap based buffer overflow. It occurs during VM guest migration, as more(8 bytes) data is moved than allocated memory area. A privileged guest user could use this issue to corrupt the VM guest image, potentially leading to a DoS. This issue affects q35 machine types. (CVE-2015-8666)

An out-of-bounds read-write access flaw was found in the…

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.

This update fixes the following security issues:

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

• bsc#956408 - CVE-2015-8339, CVE-2015-8340: xen: XENMEM_exchange error handling issues (XSA-159) xsa159.patch

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

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

• bsc#953527 - CVE-2015-5307: kernel: kvm/xen: x86: avoid guest->host DOS by intercepting #AC (XSA-156)

• bsc#950704 - CVE-2015-7970: xen: x86: Long latency populate-on-demand operation is not preemptible (XSA-150)

• bsc#951845 - CVE-2015-7972: xen: x86: populate-on-demand balloon size inaccuracy can crash guests (XSA-153)

• bsc#950703 - CVE-2015-7969: xen: leak of main per-domain vcpu pointer array (DoS) (XSA-149)

• bsc#950705 - CVE-2015-7969: xen: x86: leak of per-domain profiling-related vcpu pointer array (DoS) (XSA-151)

• bsc#950706 - CVE-2015-7971: xen: x86: some pmu and profiling hypercalls log without rate limiting (XSA-152)

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)

This update fixes the following security issues:

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

• 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)

• bsc#950704 - CVE-2015-7970: xen: x86: Long latency populate-on-demand operation is not preemptible (XSA-150)

• bsc#951845 - CVE-2015-7972: xen: x86: populate-on-demand balloon size inaccuracy can crash guests (XSA-153)

• bsc#950703 - CVE-2015-7969: xen: leak of main per-domain vcpu pointer array (DoS) (XSA-149)

• bsc#950705 - CVE-2015-7969: xen: x86: leak of per-domain profiling-related vcpu pointer array (DoS) (XSA-151)

• bsc#950706 - CVE-2015-7971: xen: x86: some pmu and profiling hypercalls log without rate limiting (XSA-152)

This update fixes the following security issues:

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

• 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) CVE-2015-5307-xsa156.patch

• bsc#950704 - CVE-2015-7970: xen: x86: Long latency populate-on-demand operation is not preemptible (XSA-150) 563212c9-x86-PoD-Eager-sweep-for-zeroed-pages.patch

• bsc#951845 - CVE-2015-7972: xen: x86: populate-on-demand balloon size inaccuracy can crash guests (XSA-153) xsa153-libxl.patch xend-xsa153.patch

• Drop 5604f239-x86-PV-properly-populate-descriptor-tables.patch

• bsc#950703 - CVE-2015-7969: xen: leak of main per-domain vcpu pointer array (DoS) (XSA-149)

• bsc#950705 - CVE-2015-7969: xen: x86: leak of per-domain profiling-related vcpu pointer array (DoS) (XSA-151)

• bsc#950706 - CVE-2015-7971: xen: x86: some pmu and profiling hypercalls log without rate limiting (XSA-152)

  This update fixes the following security issues:

• bsc#955399 - Fix xm migrate --log_progress. Due to logic error progress was not logged when requested.

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

• 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#955399 - Fix xm migrate --live. The options were not passed due to a merge error. As a result the migration was not live, instead the suspended guest was migrated.

• 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)

• bsc#950704 - CVE-2015-7970: xen: x86: Long latency populate-on-demand operation is not preemptible (XSA-150)

• bsc#951845 - CVE-2015-7972: xen: x86: populate-on-demand balloon size inaccuracy can crash guests (XSA-153)

• Drop 5604f239-x86-PV-properly-populate-descriptor-tables.patch

• bsc#950703 - CVE-2015-7969: xen: leak of main per-domain vcpu pointer array (DoS) (XSA-149)

• bsc#950705 - CVE-2015-7969: xen: x86: leak of per-domain profiling-related vcpu pointer array (DoS) (XSA-151)

• bsc#950706 - CVE-2015-7971: xen: x86: some pmu and profiling hypercalls log without rate limiting (XSA-152)

Jason Wang discovered that QEMU incorrectly handled the virtio-net device. A remote attacker could use this issue to cause guest network consumption, resulting in a denial of service. (CVE-2015-7295)

Qinghao Tang and Ling Liu discovered that QEMU incorrectly handled the pcnet driver when used in loopback mode. 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-2015-7504)

Ling Liu and Jason Wang discovered that QEMU incorrectly handled the pcnet driver. A remote attacker 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-2015-7512)

Qinghao Tang discovered that QEMU incorrectly handled the eepro100 driver. A malicious guest could use this issue to cause an infinite loop, leading to a denial of service. (CVE-2015-8345)