Memory leak in the v9fs_device_unrealize_common function in hw/9pfs/9p.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) via vectors involving the order of resource cleanup.

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.

- CVE-2016-6836: vmxnet: Information leakage in     vmxnet3_complete_packet (bz #1366370)

  - CVE-2016-7909: pcnet: Infinite loop in pcnet_rdra_addr     (bz #1381196)

  - CVE-2016-7994: virtio-gpu: memory leak in     resource_create_2d (bz #1382667)

  - CVE-2016-8577: 9pfs: host memory leakage in v9fs_read     (bz #1383286)

  - CVE-2016-8578: 9pfs: potential NULL dereferencein 9pfs     routines (bz #1383292)

  - CVE-2016-8668: OOB buffer access in rocker switch     emulation (bz #1384898)

  - CVE-2016-8669: divide by zero error in     serial_update_parameters (bz #1384911)

  - CVE-2016-8910: rtl8139: infinite loop while transmit in     C+ mode (bz #1388047)

  - CVE-2016-8909: intel-hda: infinite loop in dma buffer     stream (bz #1388053)

  - Infinite loop vulnerability in a9_gtimer_update (bz     #1388300)

  - CVE-2016-9101: eepro100: memory leakage at device unplug     (bz #1389539)

  - CVE-2016-9103: 9pfs: information leakage via xattr (bz     #1389643)

  - CVE-2016-9102: 9pfs: memory leakage when creating     extended attribute (bz #1389551)

  - CVE-2016-9104: 9pfs: integer overflow leading to OOB     access (bz #1389687)

  - CVE-2016-9105: 9pfs: memory leakage in v9fs_link (bz     #1389704)

  - CVE-2016-9106: 9pfs: memory leakage in v9fs_write (bz     #1389713)

  - CVE-2016-9381: xen: incautious about shared ring     processing (bz #1397385)

  - CVE-2016-9921: Divide by zero vulnerability in     cirrus_do_copy (bz #1399054)

  - CVE-2016-9776: infinite loop while receiving data in     mcf_fec_receive (bz #1400830)

  - CVE-2016-9845: information leakage in     virgl_cmd_get_capset_info (bz #1402247)

  - CVE-2016-9846: virtio-gpu: memory leakage while updating     cursor data (bz #1402258)

  - CVE-2016-9907: usbredir: memory leakage when destroying     redirector (bz #1402266)

  - CVE-2016-9911: usb: ehci: memory leakage in     ehci_init_transfer (bz #1402273)

  - CVE-2016-9913: 9pfs: memory leakage via proxy/handle     callbacks (bz #1402277)

  - CVE-2016-10028: virtio-gpu-3d: OOB access while reading     virgl capabilities (bz #1406368)

  - CVE-2016-9908: virtio-gpu: information leakage in     virgl_cmd_get_capset (bz #1402263)

  - CVE-2016-9912: virtio-gpu: memory leakage when     destroying gpu resource (bz #1402285)

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

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.

- CVE-2016-6836: vmxnet: Information leakage in     vmxnet3_complete_packet (bz #1366370)

  - CVE-2016-7909: pcnet: Infinite loop in pcnet_rdra_addr     (bz #1381196)

  - CVE-2016-7994: virtio-gpu: memory leak in     resource_create_2d (bz #1382667)

  - CVE-2016-8577: 9pfs: host memory leakage in v9fs_read     (bz #1383286)

  - CVE-2016-8578: 9pfs: potential NULL dereferencein 9pfs     routines (bz #1383292)

  - CVE-2016-8668: OOB buffer access in rocker switch     emulation (bz #1384898)

  - CVE-2016-8669: divide by zero error in     serial_update_parameters (bz #1384911)

  - CVE-2016-8909: intel-hda: infinite loop in dma buffer     stream (bz #1388053)

  - Infinite loop vulnerability in a9_gtimer_update (bz     #1388300)

  - CVE-2016-9101: eepro100: memory leakage at device unplug     (bz #1389539)

  - CVE-2016-9103: 9pfs: information leakage via xattr (bz     #1389643)

  - CVE-2016-9102: 9pfs: memory leakage when creating     extended attribute (bz #1389551)

  - CVE-2016-9104: 9pfs: integer overflow leading to OOB     access (bz #1389687)

  - CVE-2016-9105: 9pfs: memory leakage in v9fs_link (bz     #1389704)

  - CVE-2016-9106: 9pfs: memory leakage in v9fs_write (bz     #1389713)

  - CVE-2016-9381: xen: incautious about shared ring     processing (bz #1397385)

  - CVE-2016-9921: Divide by zero vulnerability in     cirrus_do_copy (bz #1399054)

  - CVE-2016-9776: infinite loop while receiving data in     mcf_fec_receive (bz #1400830)

  - CVE-2016-9845: information leakage in     virgl_cmd_get_capset_info (bz #1402247)

  - CVE-2016-9846: virtio-gpu: memory leakage while updating     cursor data (bz #1402258)

  - CVE-2016-9907: usbredir: memory leakage when destroying     redirector (bz #1402266)

  - CVE-2016-9911: usb: ehci: memory leakage in     ehci_init_transfer (bz #1402273)

  - CVE-2016-9913: 9pfs: memory leakage via proxy/handle     callbacks (bz #1402277)

  - CVE-2016-10028: virtio-gpu-3d: OOB access while reading     virgl capabilities (bz #1406368)

  - CVE-2016-9908: virtio-gpu: information leakage in     virgl_cmd_get_capset (bz #1402263)

  - CVE-2016-9912: virtio-gpu: memory leakage when     destroying gpu resource (bz #1402285)

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

qemu was updated to fix several issues.

These security issues were fixed :

  - CVE-2016-9102: Memory leak in the v9fs_xattrcreate     function in hw/9pfs/9p.c in allowed local guest OS     administrators to cause a denial of service (memory     consumption and QEMU process crash) via a large number     of Txattrcreate messages with the same fid number     (bsc#1014256).

  - CVE-2016-9103: The v9fs_xattrcreate function in     hw/9pfs/9p.c in allowed local guest OS administrators to     obtain sensitive host heap memory information by reading     xattribute values writing to them (bsc#1007454).

  - CVE-2016-9381: Improper processing of shared rings     allowing guest administrators take over the qemu     process, elevating their privilege to that of the qemu     process (bsc#1009109)

  - CVE-2016-9776: The ColdFire Fast Ethernet Controller     emulator support was vulnerable to an infinite loop     issue while receiving packets in 'mcf_fec_receive'. A     privileged user/process inside guest could have used     this issue to crash the Qemu process on the host leading     to DoS (bsc#1013285).

  - CVE-2016-9845: The Virtio GPU Device emulator support as     vulnerable to an information leakage issue while     processing the 'VIRTIO_GPU_CMD_GET_CAPSET_INFO' command.
    A guest user/process could have used this flaw to leak     contents of the host memory (bsc#1013767).

  - CVE-2016-9846: The Virtio GPU Device emulator support     was vulnerable to a memory leakage issue while updating     the cursor data in update_cursor_data_virgl. A guest     user/process could have used this flaw to leak host     memory bytes, resulting in DoS for the host     (bsc#1013764).

  - CVE-2016-9907: The USB redirector usb-guest support was     vulnerable to a memory leakage flaw when destroying the     USB redirector in 'usbredir_handle_destroy'. A guest     user/process could have used this issue to leak host     memory, resulting in DoS for a host (bsc#1014109).

  - CVE-2016-9908: The Virtio GPU Device emulator support     was vulnerable to an information leakage issue while     processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command. A     guest user/process could have used this flaw to leak     contents of the host memory (bsc#1014514).

  - CVE-2016-9911: The USB EHCI Emulation support was     vulnerable to a memory leakage issue while processing     packet data in 'ehci_init_transfer'. A guest     user/process could have used this issue to leak host     memory, resulting in DoS for the host (bsc#1014111).

  - CVE-2016-9912: The Virtio GPU Device emulator support     was vulnerable to a memory leakage issue while     destroying gpu resource object in     'virtio_gpu_resource_destroy'. A guest user/process     could have used this flaw to leak host memory bytes,     resulting in DoS for the host (bsc#1014112).

  - CVE-2016-9913: VirtFS was vulnerable to memory leakage     issue via its '9p-handle' or '9p-proxy' backend drivers.
    A privileged user inside guest could have used this flaw     to leak host memory, thus affecting other services on     the host and/or potentially crash the Qemu process on     the host (bsc#1014110).

These non-security issues were fixed :

  - Fixed uint64 property parsing and add regression tests     (bsc#937125)

  - Added a man page for kvm_stat

  - Fix crash in vte (bsc#1008519)

  - Various upstream commits targeted towards stable     releases (bsc#1013341)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

qemu was updated to fix several issues. These security issues were fixed :

  - CVE-2016-9102: Memory leak in the v9fs_xattrcreate     function in hw/9pfs/9p.c in allowed local guest OS     administrators to cause a denial of service (memory     consumption and QEMU process crash) via a large number     of Txattrcreate messages with the same fid number     (bsc#1014256).

  - CVE-2016-9103: The v9fs_xattrcreate function in     hw/9pfs/9p.c in allowed local guest OS administrators to     obtain sensitive host heap memory information by reading     xattribute values writing to them (bsc#1007454).

  - CVE-2016-9381: Improper processing of shared rings     allowing guest administrators take over the qemu     process, elevating their privilege to that of the qemu     process (bsc#1009109)

  - CVE-2016-9776: The ColdFire Fast Ethernet Controller     emulator support was vulnerable to an infinite loop     issue while receiving packets in 'mcf_fec_receive'. A     privileged user/process inside guest could have used     this issue to crash the Qemu process on the host leading     to DoS (bsc#1013285).

  - CVE-2016-9845: The Virtio GPU Device emulator support as     vulnerable to an information leakage issue while     processing the 'VIRTIO_GPU_CMD_GET_CAPSET_INFO' command.
    A guest user/process could have used this flaw to leak     contents of the host memory (bsc#1013767).

  - CVE-2016-9846: The Virtio GPU Device emulator support     was vulnerable to a memory leakage issue while updating     the cursor data in update_cursor_data_virgl. A guest     user/process could have used this flaw to leak host     memory bytes, resulting in DoS for the host     (bsc#1013764).

  - CVE-2016-9907: The USB redirector usb-guest support was     vulnerable to a memory leakage flaw when destroying the     USB redirector in 'usbredir_handle_destroy'. A guest     user/process could have used this issue to leak host     memory, resulting in DoS for a host (bsc#1014109).

  - CVE-2016-9908: The Virtio GPU Device emulator support     was vulnerable to an information leakage issue while     processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command. A     guest user/process could have used this flaw to leak     contents of the host memory (bsc#1014514).

  - CVE-2016-9911: The USB EHCI Emulation support was     vulnerable to a memory leakage issue while processing     packet data in 'ehci_init_transfer'. A guest     user/process could have used this issue to leak host     memory, resulting in DoS for the host (bsc#1014111).

  - CVE-2016-9912: The Virtio GPU Device emulator support     was vulnerable to a memory leakage issue while     destroying gpu resource object in     'virtio_gpu_resource_destroy'. A guest user/process     could have used this flaw to leak host memory bytes,     resulting in DoS for the host (bsc#1014112).

  - CVE-2016-9913: VirtFS was vulnerable to memory leakage     issue via its '9p-handle' or '9p-proxy' backend drivers.
    A privileged user inside guest could have used this flaw     to leak host memory, thus affecting other services on     the host and/or potentially crash the Qemu process on     the host (bsc#1014110).

The update package also includes non-security fixes. See advisory for details.

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.

x86 CMPXCHG8B emulation fails to ignore operand size override [XSA-200, CVE-2016-9932] (#1404262)

----

ARM guests may induce host asynchronous abort [XSA-201, CVE-2016-9815, CVE-2016-9816, CVE-2016-9817, CVE-2016-9818] (#1399747) qemu: Divide by zero vulnerability in cirrus_do_copy (#1399055) [CVE-2016-9921, CVE-2016-9922] Qemu: 9pfs: memory leakage via proxy/handle callbacks (#1402278) qemu ioport array overflow [XSA-199, CVE-2016-9637]

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

ARM guests may induce host asynchronous abort [XSA-201, CVE-2016-9815, CVE-2016-9816, CVE-2016-9817, CVE-2016-9818] (#1399747) qemu: Divide by zero vulnerability in cirrus_do_copy (#1399055) [CVE-2016-9921, CVE-2016-9922] Qemu: 9pfs: memory leakage via proxy/handle callbacks (#1402278) qemu ioport array overflow [XSA-199, CVE-2016-9637]

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

x86 CMPXCHG8B emulation fails to ignore operand size override [XSA-200, CVE-2016-9932] (#1404262)

----

ARM guests may induce host asynchronous abort [XSA-201, CVE-2016-9815,

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

ID	Name	Product	Family	Severity
99581	Ubuntu 14.04 LTS / 16.04 LTS : QEMU vulnerabilities (USN-3261-1)	Nessus	Ubuntu Local Security Checks	critical
96782	Fedora 24 : 2:qemu (2017-12394e2cc7)	Nessus	Fedora Local Security Checks	high
96684	GLSA-201701-49 : QEMU: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
96677	Fedora 25 : 2:qemu (2017-b953d4d3a4)	Nessus	Fedora Local Security Checks	high
96623	openSUSE Security Update : qemu (openSUSE-2017-116)	Nessus	SuSE Local Security Checks	high
96529	SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2017:0127-1)	Nessus	SuSE Local Security Checks	high
96113	Fedora 24 : xen (2016-bcbae0781f)	Nessus	Fedora Local Security Checks	high
96025	Fedora 23 : xen (2016-cc2916dcf4)	Nessus	Fedora Local Security Checks	high
95945	Fedora 25 : xen (2016-1b868c23a9)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2016-9913

medium

Tenable Plugins

critical

high

medium

high

high

high

high

high

medium