Memory leak in hw/9pfs/9p-proxy.c in QEMU (aka Quick Emulator) allows local privileged guest OS users to cause a denial of service (host memory consumption and possibly QEMU process crash) by leveraging a missing cleanup operation in the proxy backend.

Several vulnerabilities were found in qemu, a fast processor emulator :

CVE-2015-8666

Heap-based buffer overflow in QEMU when built with the Q35-chipset-based PC system emulator

CVE-2016-2198

NULL pointer dereference in ehci_caps_write in the USB EHCI support that may result in denial of service

CVE-2016-6833

Use after free while writing in the vmxnet3 device that could be used to cause a denial of service

CVE-2016-6835

Buffer overflow in vmxnet_tx_pkt_parse_headers() in vmxnet3 device that could result in denial of service

CVE-2016-8576

Infinite loop vulnerability in xhci_ring_fetch in the USB xHCI support

CVE-2016-8667 / CVE-2016-8669

Divide by zero errors in set_next_tick in the JAZZ RC4030 chipset emulator, and in serial_update_parameters of some serial devices, that could result in denial of service

CVE-2016-9602

Improper link following with VirtFS

CVE-2016-9603

Heap buffer overflow via vnc connection in the Cirrus CLGD 54xx VGA emulator support

CVE-2016-9776

Infinite loop while receiving data in the ColdFire Fast Ethernet Controller emulator

CVE-2016-9907

Memory leakage in the USB redirector usb-guest support 

CVE-2016-9911

Memory leakage in ehci_init_transfer in the USB EHCI support

CVE-2016-9914 / CVE-2016-9915 / CVE-2016-9916

Plan 9 File System (9pfs): add missing cleanup operation in FileOperations, in the handle backend and in the proxy backend driver

CVE-2016-9921 / CVE-2016-9922

Divide by zero in cirrus_do_copy in the Cirrus CLGD 54xx VGA Emulator support 

CVE-2016-10155

Memory leak in hw/watchdog/wdt_i6300esb.c allowing local guest OS privileged users to cause a denial of service via a large number of device unplug operations.

CVE-2017-2615 / CVE-2017-2620 / CVE-2017-18030 / CVE-2018-5683 / CVE-2017-7718

Out-of-bounds access issues in the Cirrus CLGD 54xx VGA emulator support, that could result in denial of service

CVE-2017-5525 / CVE-2017-5526

Memory leakage issues in the ac97 and es1370 device emulation

CVE-2017-5579

Most memory leakage in the 16550A UART emulation

CVE-2017-5667

Out-of-bounds access during multi block SDMA transfer in the SDHCI emulation support.

CVE-2017-5715

Mitigations against the Spectre v2 vulnerability. For more information please refer to https://www.qemu.org/2018/01/04/spectre/

CVE-2017-5856

Memory leak in the MegaRAID SAS 8708EM2 Host Bus Adapter emulation support

CVE-2017-5973 / CVE-2017-5987 / CVE-2017-6505

Infinite loop issues in the USB xHCI, in the transfer mode register of the SDHCI protocol, and the USB ohci_service_ed_list

CVE-2017-7377

9pfs: host memory leakage via v9fs_create

CVE-2017-7493

Improper access control issues in the host directory sharing via 9pfs support.

CVE-2017-7980

Heap-based buffer overflow in the Cirrus VGA device that could allow local guest OS users to execute arbitrary code or cause a denial of service

CVE-2017-8086

9pfs: host memory leakage via v9pfs_list_xattr

CVE-2017-8112

Infinite loop in the VMWare PVSCSI emulation

CVE-2017-8309 / CVE-2017-8379

Host memory leakage issues via the audio capture buffer and the keyboard input event handlers 

CVE-2017-9330

Infinite loop due to incorrect return value in USB OHCI that may result in denial of service

CVE-2017-9373 / CVE-2017-9374

Host memory leakage during hot unplug in IDE AHCI and USB emulated devices that could result in denial of service

CVE-2017-9503

NULL pointer dereference while processing megasas command

CVE-2017-10806

Stack buffer overflow in USB redirector

CVE-2017-10911

Xen disk may leak stack data via response ring

CVE-2017-11434

Out-of-bounds read while parsing Slirp/DHCP options

CVE-2017-14167

Out-of-bounds access while processing multiboot headers that could result in the execution of arbitrary code

CVE-2017-15038

9pfs: information disclosure when reading extended attributes

CVE-2017-15289

Out-of-bounds write access issue in the Cirrus graphic adaptor that could result in denial of service

CVE-2017-16845

Information leak in the PS/2 mouse and keyboard emulation support that could be exploited during instance migration 

CVE-2017-18043

Integer overflow in the macro ROUND_UP (n, d) that could result in denial of service

CVE-2018-7550

Incorrect handling of memory during multiboot that could may result in execution of arbitrary code

For Debian 8 'Jessie', these problems have been fixed in version 1:2.1+dfsg-12+deb8u7.

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.

The remote Ubuntu 14.04 LTS / 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3261-1 advisory.

    Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU device. An attacker inside the guest     could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected     Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-10028, CVE-2016-10029)

    Li Qiang discovered that QEMU incorrectly handled the 6300esb watchdog. A privileged attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2016-10155)

    Li Qiang discovered that QEMU incorrectly handled the i.MX Fast Ethernet Controller. A privileged attacker     inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue     only affected Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-7907)

    It was discovered that QEMU incorrectly handled the JAZZ RC4030 device. A privileged attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2016-8667)

    It was discovered that QEMU incorrectly handled the 16550A UART device. A privileged attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2016-8669)

    It was discovered that QEMU incorrectly handled the shared rings when used with Xen. A privileged attacker     inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service, or     possibly execute arbitrary code on the host. (CVE-2016-9381)

    Jann Horn discovered that QEMU incorrectly handled VirtFS directory sharing. A privileged attacker inside     the guest could use this issue to access files on the host file system outside of the shared directory and     possibly escalate their privileges. In the default installation, when QEMU is used with libvirt, attackers     would be isolated by the libvirt AppArmor profile. (CVE-2016-9602)

    Gerd Hoffmann discovered that QEMU incorrectly handled the Cirrus VGA device when being used with a VNC     connection. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting     in a denial of service, or possibly execute arbitrary code on the host. In the default installation, when     QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile. (CVE-2016-9603)

    It was discovered that QEMU incorrectly handled the ColdFire Fast Ethernet Controller. A privileged     attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service.
    (CVE-2016-9776)

    Li Qiang discovered that QEMU incorrectly handled the Virtio GPU device. An attacker inside the guest     could use this issue to cause QEMU to leak contents of host memory. This issue only affected Ubuntu 16.04     LTS and Ubuntu 16.10. (CVE-2016-9845, CVE-2016-9908)

    Li Qiang discovered that QEMU incorrectly handled the Virtio GPU device. An attacker inside the guest     could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected     Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-9846, CVE-2016-9912, CVE-2017-5552, CVE-2017-5578,     CVE-2017-5857)

    Li Qiang discovered that QEMU incorrectly handled the USB redirector. An attacker inside the guest could     use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu     16.04 LTS and Ubuntu 16.10. (CVE-2016-9907)

    Li Qiang discovered that QEMU incorrectly handled USB EHCI emulation. An attacker inside the guest could     use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2016-9911)

    Li Qiang discovered that QEMU incorrectly handled VirtFS directory sharing. A privileged attacker inside     the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2016-9913,     CVE-2016-9914, CVE-2016-9915, CVE-2016-9916)

    Qinghao Tang, Li Qiang, and Jiangxin discovered that QEMU incorrectly handled the Cirrus VGA device. A     privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of     service. (CVE-2016-9921, CVE-2016-9922)

    Wjjzhang and Li Qiang discovered that QEMU incorrectly handled the Cirrus VGA device. A privileged     attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service,     or possibly execute arbitrary code on the host. In the default installation, when QEMU is used with     libvirt, attackers would be isolated by the libvirt AppArmor profile. (CVE-2017-2615)

    It was discovered that QEMU incorrectly handled the Cirrus VGA device. A privileged attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute     arbitrary code on the host. In the default installation, when QEMU is used with libvirt, attackers would     be isolated by the libvirt AppArmor profile. (CVE-2017-2620)

    It was discovered that QEMU incorrectly handled VNC connections. An attacker inside the guest could use     this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-2633)

    Li Qiang discovered that QEMU incorrectly handled the ac97 audio device. A privileged attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-5525)

    Li Qiang discovered that QEMU incorrectly handled the es1370 audio device. A privileged attacker inside     the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-5526)

    Li Qiang discovered that QEMU incorrectly handled the 16550A UART device. A privileged attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-5579)

    Jiang Xin discovered that QEMU incorrectly handled SDHCI device emulation. A privileged attacker inside     the guest could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly     execute arbitrary code on the host. In the default installation, when QEMU is used with libvirt, attackers     would be isolated by the libvirt AppArmor profile. (CVE-2017-5667)

    Li Qiang discovered that QEMU incorrectly handled the MegaRAID SAS device. A privileged attacker inside     the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-5856)

    Li Qiang discovered that QEMU incorrectly handled the CCID Card device. A privileged attacker inside the     guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-5898)

    Li Qiang discovered that QEMU incorrectly handled USB xHCI controller emulation. A privileged attacker     inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service.
    (CVE-2017-5973)

    Jiang Xin and Wjjzhang discovered that QEMU incorrectly handled SDHCI device emulation. A privileged     attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service.
    (CVE-2017-5987)

    Li Qiang discovered that QEMU incorrectly handled USB OHCI controller emulation. A privileged attacker     inside the guest could use this issue to cause QEMU to hang, resulting in a denial of service.
    (CVE-2017-6505)

Tenable has extracted the preceding description block directly from the Ubuntu 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 remote host is affected by the vulnerability described in GLSA-201701-49 (QEMU: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in QEMU. Please review the       CVE identifiers referenced below for details.
  Impact :

    A privileged user/process within a guest QEMU environment can cause a       Denial of Service condition against the QEMU guest process or the host.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Severity
117351	Debian DLA-1497-1 : qemu security update (Spectre)	Nessus	Debian Local Security Checks	critical
99581	Ubuntu 14.04 LTS / 16.04 LTS : QEMU vulnerabilities (USN-3261-1)	Nessus	Ubuntu Local Security Checks	critical
96684	GLSA-201701-49 : QEMU: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium

Detections

Analytics

CVE-2016-9916

medium

Tenable Plugins

critical

critical

medium