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

  - CVE-2017-9375     Denial of service via memory leak in USB XHCI emulation.

  - CVE-2017-12809     Denial of service in the CDROM device drive emulation.

  - CVE-2017-13672     Denial of service in VGA display emulation.

  - CVE-2017-13711     Denial of service in SLIRP networking support.

  - CVE-2017-14167     Incorrect validation of multiboot headers could result     in the execution of arbitrary code.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Use-after-free vulnerability in the sofree function in slirp/socket.c in QEMU (aka Quick Emulator) allows     attackers to cause a denial of service (QEMU instance crash) by leveraging failure to properly clear     ifq_so from pending packets. (CVE-2017-13711)

Note that Nessus relies on the presence of the package as reported by the vendor.

According to the versions of the qemu-kvm packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - Memory leak in hw/audio/es1370.c in QEMU (aka Quick     Emulator) allows local guest OS privileged users to     cause a denial of service (host memory consumption and     QEMU process crash) via a large number of device unplug     operations.(CVE-2017-5526)

  - Memory leak in hw/audio/ac97.c in QEMU (aka Quick     Emulator) allows local guest OS privileged users to     cause a denial of service (host memory consumption and     QEMU process crash) via a large number of device unplug     operations.(CVE-2017-5525)

  - The xhci_kick_epctx function in hw/usb/hcd-xhci.c in     QEMU (aka Quick Emulator) allows local guest OS     privileged users to cause a denial of service (infinite     loop and QEMU process crash) via vectors related to     control transfer descriptor sequence.(CVE-2017-5973)

  - The sdhci_sdma_transfer_multi_blocks function in     hw/sd/sdhci.c in QEMU (aka Quick Emulator) allows local     OS guest privileged users to cause a denial of service     (infinite loop and QEMU process crash) via vectors     involving the transfer mode register during multi block     transfer.(CVE-2017-5987)

  - Memory leak in the megasas_handle_dcmd function in     hw/scsi/megasas.c in QEMU (aka Quick Emulator) allows     local guest OS privileged users to cause a denial of     service (host memory consumption) via MegaRAID Firmware     Interface (MFI) commands with the sglist size set to a     value over 2 Gb.(CVE-2017-5856)

  - qemu_deliver_packet_iov in net/net.c in Qemu accepts     packet sizes greater than INT_MAX, which allows     attackers to cause a denial of service or possibly have     unspecified other impact.(CVE-2018-17963)

  - qemu-bridge-helper.c in QEMU 4.0.0 does not ensure that     a network interface name (obtained from bridge.conf or     a --br=bridge option) is limited to the IFNAMSIZ size,     which can lead to an ACL bypass.(CVE-2019-13164)

  - Buffer overflow in the 'megasas_mmio_write' function in     Qemu 2.9.0 allows remote attackers to have unspecified     impact via unknown vectors.(CVE-2017-8380)

  - Quick Emulator (Qemu) built with the VirtFS, host     directory sharing via Plan 9 File System(9pfs) support,     is vulnerable to an improper access control issue. It     could occur while accessing virtfs metadata files in     mapped-file security mode. A guest user could use this     flaw to escalate their privileges inside     guest.(CVE-2017-7493)

  - In QEMU 3.1.0, load_device_tree in device_tree.c calls     the deprecated load_image function, which has a buffer     overflow risk.(CVE-2018-20815)

  - Use-after-free vulnerability in the sofree function in     slirp/socket.c in QEMU (aka Quick Emulator) allows     attackers to cause a denial of service (QEMU instance     crash) by leveraging failure to properly clear ifq_so     from pending packets.(CVE-2017-13711)

  - Stack-based buffer overflow in hw/usb/redirect.c in     QEMU (aka Quick Emulator) allows local guest OS users     to cause a denial of service (QEMU process crash) via     vectors related to logging debug     messages.(CVE-2017-10806)

  - The dhcp_decode function in slirp/bootp.c in QEMU (aka     Quick Emulator) allows local guest OS users to cause a     denial of service (out-of-bounds read and QEMU process     crash) via a crafted DHCP options     string.(CVE-2017-11434)

  - The imx_fec_do_tx function in hw/net/imx_fec.c in QEMU     (aka Quick Emulator) does not properly limit the buffer     descriptor count when transmitting packets, which     allows local guest OS administrators to cause a denial     of service (infinite loop and QEMU process crash) via     vectors involving a buffer descriptor with a length of     0 and crafted values in bd.flags.(CVE-2016-7907)

  - tcp_emu in slirp/tcp_subr.c (aka slirp/src/tcp_subr.c)     in QEMU 3.0.0 uses uninitialized data in an snprintf     call, leading to Information disclosure.(CVE-2019-9824)

  - interface_release_resource in hw/display/qxl.c in QEMU     4.0.0 has a NULL pointer dereference.(CVE-2019-12155)

  - hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator)     allows local guest OS privileged users to cause a     denial of service (infinite loop and CPU consumption)     via the message ring page count.(CVE-2017-8112)

  - Qemu has a Buffer Overflow in rtl8139_do_receive in     hw/net/rtl8139.c because an incorrect integer data type     is used.(CVE-2018-17958)

  - TSX Asynchronous Abort condition on some CPUs utilizing     speculative execution may allow an authenticated user     to potentially enable information disclosure via a side     channel with local access.(CVE-2019-11135)

  - In QEMU 1:4.1-1, 1:2.1+dfsg-12+deb8u6,     1:2.8+dfsg-6+deb9u8, 1:3.1+dfsg-8~deb10u1,     1:3.1+dfsg-8+deb10u2, and 1:2.1+dfsg-12+deb8u12     (fixed), when executing script in lsi_execute_script(),     the LSI scsi adapter emulator advances 's->dsp' index     to read next opcode. This can lead to an infinite loop     if the next opcode is empty. Move the existing loop     exit after 10k iterations so that it covers no-op     opcodes as well.(CVE-2019-12068)

  - qemu-seccomp.c in QEMU might allow local OS guest users     to cause a denial of service (guest crash) by     leveraging mishandling of the seccomp policy for     threads other than the main thread.(CVE-2018-15746)

  - Qemu has a Buffer Overflow in pcnet_receive in     hw/net/pcnet.c because an incorrect integer data type     is used.(CVE-2018-17962)

  - Quick Emulator(Qemu) built with the VMWARE PVSCSI     paravirtual SCSI bus emulation support is vulnerable to     an OOB r/w access issue. It could occur while     processing SCSI commands 'PVSCSI_CMD_SETUP_RINGS' or     'PVSCSI_CMD_SETUP_MSG_RING'. A privileged user inside     guest could use this flaw to crash the Qemu process     resulting in DoS.(CVE-2016-4952)

  - m_cat in slirp/mbuf.c in Qemu has a heap-based buffer     overflow via incoming fragmented     datagrams.(CVE-2018-11806)

  - In Qemu 3.0.0, lsi_do_msgin in hw/scsi/lsi53c895a.c     allows out-of-bounds access by triggering an invalid     msg_len value.(CVE-2018-18849)

  - hw/9pfs/cofile.c and hw/9pfs/9p.c in QEMU can modify an     fid path while it is being accessed by a second thread,     leading to (for example) a use-after-free     outcome.(CVE-2018-19364)

  - v9fs_wstat in hw/9pfs/9p.c in QEMU allows guest OS     users to cause a denial of service (crash) because of a     race condition during file renaming.(CVE-2018-19489)

  - QEMU, through version 2.10 and through version 3.1.0,     is vulnerable to an out-of-bounds read of up to 128     bytes in the hw/i2c/i2c-ddc.c:i2c_ddc() function. A     local attacker with permission to execute i2c commands     could exploit this to read stack memory of the qemu     process on the host.(CVE-2019-3812)

  - A flaw was found in QEMU's Media Transfer Protocol     (MTP). The code opening files in usb_mtp_get_object and     usb_mtp_get_partial_object and directories in     usb_mtp_object_readdir doesn't consider that the     underlying filesystem may have changed since the time     lstat(2) was called in usb_mtp_object_alloc, a     classical TOCTTOU problem. An attacker with write     access to the host filesystem, shared with a guest, can     use this property to navigate the host filesystem in     the context of the QEMU process and read any file the     QEMU process has access to. Access to the filesystem     may be local or via a network share protocol such as     CIFS.(CVE-2018-16872)

  - ** DISPUTED ** An issue was discovered in ide_dma_cb()     in hw/ide/core.c in QEMU 2.4.0 through 4.2.0. The guest     system can crash the QEMU process in the host system     via a special SCSI_IOCTL_SEND_COMMAND. It hits an     assertion that implies that the size of successful DMA     transfers there must be a multiple of 512 (the size of     a sector). NOTE: a member of the QEMU security team     disputes the significance of this issue because a     'privileged guest user has many ways to cause similar     DoS effect, without triggering this     assert.'(CVE-2019-20175)

  - Quick Emulator (QEMU) built with Network Block Device     (NBD) Server support was vulnerable to a null-pointer     dereference issue. The flaw could occur when releasing     a client that was not initialized due to failed     negotiation. A remote user or process could exploit     this flaw to crash the qemu-nbd server (denial of     service).(CVE-2017-9524)

  - Qemu has integer overflows because IOReadHandler and     its associated functions use a signed integer data type     for a size value.(CVE-2018-18438)

  - The Bluetooth subsystem in QEMU mishandles negative     values for length variables, leading to memory     corruption.(CVE-2018-19665)

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

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-4289 advisory.

    - net: ignore packet size greater than INT_MAX (Jason Wang)  [Orabug: 28763782]  {CVE-2018-17963}
    - pcnet: fix possible buffer overflow (Jason Wang)  [Orabug: 28763774]  {CVE-2018-17962}
    - rtl8139: fix possible out of bound access (Jason Wang)  [Orabug: 28763765]  {CVE-2018-17958}
    - ne2000: fix possible out of bound access in ne2000_receive (Jason Wang)  [Orabug: 28763758]     {CVE-2018-10839}
    - seccomp: set the seccomp filter to all threads (Marc-Andre Lureau)  [Orabug: 28763748]  {CVE-2018-15746}
    - Document various CVEs as fixed (Mark Kanda)  [Orabug: 28763710]  {CVE-2017-10806} {CVE-2017-11334}     {CVE-2017-12809} {CVE-2017-13672} {CVE-2017-13673} {CVE-2017-13711} {CVE-2017-14167} {CVE-2017-15038}     {CVE-2017-15119} {CVE-2017-15124} {CVE-2017-15268} {CVE-2017-15289} {CVE-2017-16845} {CVE-2017-17381}     {CVE-2017-18030} {CVE-2017-18043} {CVE-2017-2630} {CVE-2017-2633} {CVE-2017-5715} {CVE-2017-5753}     {CVE-2017-5754} {CVE-2017-7471} {CVE-2017-7493} {CVE-2017-8112} {CVE-2017-8309} {CVE-2017-8379}     {CVE-2017-8380} {CVE-2017-9503} {CVE-2018-11806} {CVE-2018-12617} {CVE-2018-3639} {CVE-2018-5683}     {CVE-2018-7550} {CVE-2018-7858}
    - multiboot.c: Document as fixed against CVE-2018-7550 (Jack Schwartz)  [Orabug: 27832332]     {CVE-2018-7550}
    - CVE-2017-18030: cirrus_invalidate_region() lets priv guest user cause DoS (Mark Kanda)  [Orabug:
    27832319]  {CVE-2017-18030}
    - vga: fix region calculation (Gerd Hoffmann)  [Orabug: 27832309]  {CVE-2018-7858}

Tenable has extracted the preceding description block directly from the Oracle 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.

According to the versions of the qemu packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - Quick Emulator (Qemu) built with the VirtFS, host     directory sharing via Plan 9 File System(9pfs) support,     is vulnerable to an improper access control issue. It     could occur while accessing virtfs metadata files in     mapped-file security mode. A guest user could use this     flaw to escalate their privileges inside     guest.(CVE-2017-7493)

  - qemu-bridge-helper.c in QEMU 4.0.0 does not ensure that     a network interface name (obtained from bridge.conf or     a --br=bridge option) is limited to the IFNAMSIZ size,     which can lead to an ACL bypass.(CVE-2019-13164)

  - Qemu has a Buffer Overflow in pcnet_receive in     hw/net/pcnet.c because an incorrect integer data type     is used.(CVE-2018-17962)

  - Buffer overflow in the 'megasas_mmio_write' function in     Qemu 2.9.0 allows remote attackers to have unspecified     impact via unknown vectors.(CVE-2017-8380)

  - qemu_deliver_packet_iov in net/net.c in Qemu accepts     packet sizes greater than INT_MAX, which allows     attackers to cause a denial of service or possibly have     unspecified other impact.(CVE-2018-17963)

  - In QEMU 3.1.0, load_device_tree in device_tree.c calls     the deprecated load_image function, which has a buffer     overflow risk.(CVE-2018-20815)

  - interface_release_resource in hw/display/qxl.c in QEMU     4.0.0 has a NULL pointer dereference.(CVE-2019-12155)

  - An issue was discovered in ide_dma_cb() in     hw/ide/core.c in QEMU 2.4.0 through 4.2.0. The guest     system can crash the QEMU process in the host system     via a special SCSI_IOCTL_SEND_COMMAND. It hits an     assertion that implies that the size of successful DMA     transfers there must be a multiple of 512 (the size of     a sector). NOTE: a member of the QEMU security team     disputes the significance of this issue because a     'privileged guest user has many ways to cause similar     DoS effect, without triggering this     assert.'(CVE-2019-20175)

  - Use-after-free vulnerability in the sofree function in     slirp/socket.c in QEMU (aka Quick Emulator) allows     attackers to cause a denial of service (QEMU instance     crash) by leveraging failure to properly clear ifq_so     from pending packets.(CVE-2017-13711)

  - Qemu has a Buffer Overflow in rtl8139_do_receive in     hw/net/rtl8139.c because an incorrect integer data type     is used.(CVE-2018-17958)

  - ip_reass in ip_input.c in libslirp 4.0.0 has a     heap-based buffer overflow via a large packet because     it mishandles a case involving the first     fragment.(CVE-2019-14378)

  - m_cat in slirp/mbuf.c in Qemu has a heap-based buffer     overflow via incoming fragmented     datagrams.(CVE-2018-11806)

  - Memory leak in the audio/audio.c in QEMU (aka Quick     Emulator) allows remote attackers to cause a denial of     service (memory consumption) by repeatedly starting and     stopping audio capture.(CVE-2017-8309)

  - Memory leak in the keyboard input event handlers     support in QEMU (aka Quick Emulator) allows local guest     OS privileged users to cause a denial of service (host     memory consumption) by rapidly generating large     keyboard events.(CVE-2017-8379)

  - hw/input/ps2.c in Qemu does not validate 'rptr' and     'count' values during guest migration, leading to     out-of-bounds access(CVE-2017-16845)

  - The cirrus_invalidate_region function in     hw/display/cirrus_vga.c in Qemu allows local OS guest     privileged users to cause a denial of service     (out-of-bounds array access and QEMU process crash) via     vectors related to negative pitch.(CVE-2017-18030)

  - An out-of-bounds read/write access flaw was found in     the USB emulator of the QEMU in versions before 5.2.0.
    This issue occurs while processing USB packets from a     guest when USBDevice 'setup_len' exceeds its     'data_buf[4096]' in the do_token_in, do_token_out     routines. This flaw allows a guest user to crash the     QEMU process, resulting in a denial of service, or the     potential execution of arbitrary code with the     privileges of the QEMU process on the     host.(CVE-2020-14364)

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

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0816 advisory.

    Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of     architectures. The qemu-kvm packages provide the user-space component for running virtual machines that     use KVM.

    Security Fix(es):

    * Qemu: vga: OOB read access during display update (CVE-2017-13672)

    * Qemu: Slirp: use-after-free when sending response (CVE-2017-13711)

    * Qemu: memory exhaustion through framebuffer update request message in VNC server (CVE-2017-15124)

    * Qemu: I/O: potential memory exhaustion via websock connection to VNC (CVE-2017-15268)

    * Qemu: Out-of-bounds read in vga_draw_text routine (CVE-2018-5683)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

    Red Hat would like to thank David Buchanan for reporting CVE-2017-13672; Wjjzhang (Tencent.com) for     reporting CVE-2017-13711; and Jiang Xin and Lin ZheCheng for reporting CVE-2018-5683. The CVE-2017-15124     issue was discovered by Daniel Berrange (Red Hat).

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes     linked from the References section.

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.

According to the versions of the qemu-kvm packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - QEMU (aka Quick Emulator), when built with the VGA     display emulator support, allows local guest OS     privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) via vectors     involving display update.(CVE-2017-13672)

  - Use-after-free vulnerability in the sofree function in     slirp/socket.c in QEMU (aka Quick Emulator) allows     attackers to cause a denial of service (QEMU instance     crash) by leveraging failure to properly clear ifq_so     from pending packets.(CVE-2017-13711)

  - VNC server implementation in Quick Emulator (QEMU)     2.11.0 and older was found to be vulnerable to an     unbounded memory allocation issue, as it did not     throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server     allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to     cause DoS to the server host.(CVE-2017-15124)

  - Qemu through 2.10.0 allows remote attackers to cause a     memory leak by triggering slow data-channel read     operations, related to     io/channel-websock.c.(CVE-2017-15268)

  - The vga_draw_text function in Qemu allows local OS     guest privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) by     leveraging improper memory address     validation.(CVE-2018-5683)

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

This update for qemu to version 2.9.1 fixes several issues. It also announces that the qed storage format will be no longer supported in SLE 15 (fate#324200). These security issues were fixed :

  - CVE-2017-15268: Qemu allowed remote attackers to cause a     memory leak by triggering slow data-channel read     operations, related to io/channel-websock.c     (bsc#1062942)

  - CVE-2017-15289: The mode4and5 write functions allowed     local OS guest privileged users to cause a denial of     service (out-of-bounds write access and Qemu process     crash) via vectors related to dst calculation     (bsc#1063122)

  - CVE-2017-15038: Race condition in the v9fs_xattrwalk     function local guest OS users to obtain sensitive     information from host heap memory via vectors related to     reading extended attributes (bsc#1062069)

  - CVE-2017-10911: The make_response function in the Linux     kernel allowed guest OS users to obtain sensitive     information from host OS (or other guest OS) kernel     memory by leveraging the copying of uninitialized     padding fields in Xen block-interface response     structures (bsc#1057378)

  - CVE-2017-12809: The IDE disk and CD/DVD-ROM Emulator     support allowed local guest OS privileged users to cause     a denial of service (NULL pointer dereference and QEMU     process crash) by flushing an empty CDROM device drive     (bsc#1054724)

  - CVE-2017-14167: Integer overflow in the load_multiboot     function allowed local guest OS users to execute     arbitrary code on the host via crafted multiboot header     address values, which trigger an out-of-bounds write     (bsc#1057585)

  - CVE-2017-13672: The VGA display emulator support allowed     local guest OS privileged users to cause a denial of     service (out-of-bounds read and QEMU process crash) via     vectors involving display update (bsc#1056334)

  - CVE-2017-13711: Use-after-free vulnerability allowed     attackers to cause a denial of service (QEMU instance     crash) by leveraging failure to properly clear ifq_so     from pending packets (bsc#1056291).

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.

來自 Red Hat 安全公告 2018:0816： 現已提供適用於 Red Hat Enterprise Linux 7 的 qemu-kvm 更新。 Red Hat 產品安全性團隊已將此更新評等為具有低安全性影響。可從〈參照〉一節的 CVE 連結中取得每個弱點之常見弱點評分系統 (CVSS) 的基本分數，其中包含有關嚴重性評等的詳細資訊。 核心型虛擬機器 (KVM) 是各種架構上 Linux 的完全虛擬化解決方案。qemu-kvm 套件可提供使用 KVM 執行虛擬機器的使用者空間元件。 安全性修正： * Qemu: vga：顯示更新期間的 OOB 讀取存取權 (CVE-2017-13672) * Qemu: Slirp：傳送回應時發生釋放後使用問題 (CVE-2017-13711) * Qemu：因 VNC 伺服器中的 framebuffer 更新要求訊息而耗盡記憶體 (CVE-2017-15124) * Qemu: I/O: 透過 Websock 連接到 VNC 可能導致記憶體耗盡 (CVE-2017-15268) * Qemu：vga_draw_text 常式中存在越界讀取 (CVE-2018-5683) 如需安全性問題的詳細資料，包括影響、CVSS 分數及其他相關資訊，請參閱〈參照〉一節列出的 CVE 頁面。 Red Hat 感謝 David Buchanan 通報 CVE-2017-13672；感謝 Wjjzhang (Tencent.com) 通報 CVE-2017-13711； 並感謝 Jiang Xin 和 Lin ZheCheng 通報 CVE-2018-5683。CVE-2017-15124 問題是由 Daniel Berrange (Red Hat) 所發現。 其他變更： 如需有關此發行版本本的詳細變更資訊，請參閱可從「參考」部分連結的 Red Hat Enterprise Linux 7.5 版本說明。

現已提供適用於 Red Hat Enterprise Linux 7 的 qemu-kvm 更新。

Red Hat 產品安全性團隊已將此更新評等為具有低安全性影響。可從〈參照〉一節的 CVE 連結中取得每個弱點之常見弱點評分系統 (CVSS) 的基本分數，其中包含有關嚴重性評等的詳細資訊。

核心型虛擬機器 (KVM) 是各種架構上 Linux 的完全虛擬化解決方案。qemu-kvm 套件為執行使用 KVM 的虛擬機器提供使用者空間元件。

安全性修正：

* Qemu: vga：顯示更新期間的 OOB 讀取存取權 (CVE-2017-13672)

* Qemu: Slirp：傳送回應時發生釋放後使用問題 (CVE-2017-13711)

* Qemu：因 VNC 伺服器中的 framebuffer 更新要求訊息而耗盡記憶體 (CVE-2017-15124)

* Qemu: I/O: 透過 Websock 連接到 VNC 可能導致記憶體耗盡 (CVE-2017-15268)

* Qemu：vga_draw_text 常式中存在越界讀取 (CVE-2018-5683)

如需安全性問題的詳細資料，包括影響、CVSS 分數及其他相關資訊，請參閱〈參照〉一節列出的 CVE 頁面。

Red Hat 感謝 David Buchanan 通報 CVE-2017-13672；感謝 Wjjzhang (Tencent.com) 通報 CVE-2017-13711；
並感謝 Jiang Xin 和 Lin ZheCheng 通報 CVE-2018-5683。CVE-2017-15124 問題是由 Daniel Berrange (Red Hat) 所發現。

其他變更：

如需有關此發行版本的詳細變更資訊，請參閱可從「參照」一節連結的 Red Hat Enterprise Linux 7.5 版本資訊。

在內建到 Quick emulator (QEMU) 的 VGA 顯示模擬器中發現一個超出邊界讀取存取問題。此問題可能會在讀取 VGA 記憶體以更新圖形顯示時發生。客體機中的特權使用者/處理程序可利用此缺陷使 QEMU 處理程序損毀，進而導致拒絕服務的情況。(CVE-2017-13672)

在 Quick Emulator (QEMU) 的 I/O 通道 websocket 實作中發現記憶體流失問題。此問題可能會在將畫面更新傳送至用戶端時發生，這會使讀取並進一步處理它們速度變慢。客體機中的特權使用者可利用此缺陷在主機上造成拒絕服務，並且/或可能導致主機上的 QEMU 處理程序執行個體損毀。(CVE-2017-15268)

在 Quick emulator (QEMU) 的 Slirp 網路實作中發現釋放後使用問題。如果在回應訊息時釋放參照自多個封包的通訊端，則會發生這個問題。使用者/處理程序可利用此缺陷使主機上的 QEMU 處理程序損毀，進而導致拒絕服務的情況。(CVE-2017-13711)

Quick Emulator (亦即 QEMU) 若在構建時配搭 Cirrus CLGD 54xx VGA Emulator 支援，則具有本機客體 OS 特權的使用者可以利用更新 VGA 顯示時錯誤的區域計算，來造成拒絕服務 (超出邊界存取和 QEMU 處理程序損毀)。(CVE-2018-7858) 

據發現，Quick Emulator (QEMU) 中的 VNC 伺服器實作容易發生記憶體配置無邊界限制的問題，這是因為它並未限制傳送至其用戶端的 framebuffer 更新。如果用戶端沒有耗用這些更新，VNC 伺服器就會配置不斷增長的記憶體以保留此資料。惡意的遠端 VNC 用戶端可利用此缺陷來造成伺服器主機拒絕服務。(CVE-2017-15124)

許多現代微處理器設計已採用「載入和儲存」指令的推測執行 (常用的效能最佳化)，在這個方法中發現業界普遍存在的問題。它依賴權限程式碼中精確定義的指令序列的存在，並依賴以下事實：從最近發生記憶體寫入的位址讀取記憶體可能會看到較舊的值，因此造成微處理器資料外取的更新，即使從未實際認可 (淘汰) 推測執行的指令。因此，無權限的攻擊者可利用此缺陷透過進行目標式快取旁路攻擊來讀取有特殊權限的記憶體。(CVE-2018-3639)

在 QEMU 的 VGA 模擬器中，發現一個越界讀取存取問題。更新 vnc 用戶端的顯示區域時，可能會在 vga_draw_text 常式中發生這個問題。客體中有特殊權限的使用者可利用此缺陷損毀 QEMU 處理程序，進而導致 DoS。(CVE-2018-5683)

現已提供適用於 Red Hat Enterprise Linux 7 之 Red Hat Virtualization 4 的 qemu-kvm-rhev 更新。Red Hat 產品安全性團隊已將此更新評等為具有重要安全性影響。可從〈參照〉一節的 CVE 連結中取得每個弱點之常見弱點評分系統 (CVSS) 的基本分數，其中包含有關嚴重性評等的詳細資訊。KVM (核心型虛擬機器) 是各種架構上 Linux 的完全虛擬化解決方案。qemu-kvm-rhev 套件會提供使用者空間元件，以供在 Red Hat 產品所管理的環境中，使用 KVM 執行虛擬機器。下列套件已升級至更新的上游版本：qemu-kvm-rhev (2.10.0)。(BZ#1470749) 安全性修正：* Qemu：NBD 伺服器中透過長匯出名稱觸發的堆疊型緩衝區溢位 (CVE-2017-15118) * Qemu：透過大型選項要求發生 DoS (CVE-2017-15119) * Qemu：vga：顯示器更新期間發生 OOB 讀取存取 (CVE-2017-13672) * Qemu：vga：顯示器更新期間發生可連線宣告失敗 (CVE-2017-13673) * Qemu：Slirp：傳送回應時發生釋放後使用 (CVE-2017-13711) * Qemu：VNC 伺服器中的 framebuffer 更新要求訊息耗盡記憶體 (CVE-2017-15124) * Qemu：I/O：透過 websock 連線到 VNC 時可能發生記憶體耗盡 (CVE-2017-15268) * Qemu：vga_draw_text 常式中發生超出邊界讀取 (CVE-2018-5683) 如需安全性問題的詳細資料，包括影響、CVSS 分數及其他相關資訊，請參閱〈參照〉一節列出的 CVE 頁面。Red Hat 感謝 David Buchanan 報告 CVE-2017-13672 和 CVE-2017-13673；感謝 Wjjzhang (Tencent.com) 報告 CVE-2017-13711；及感謝 Jiang Xin 和 Lin ZheCheng 報告 CVE-2018-5683。CVE-2017-15118 和 CVE-2017-15119 問題由 Eric Blake (Red Hat) 所發現，而 CVE-2017-15124 問題由 Daniel Berrange (Red Hat) 所發現。

ID	Name	Product	Family	Published	Updated	Severity
103655	Debian DSA-3991-1 : qemu - security update	Nessus	Debian Local Security Checks	10/4/2017	1/4/2021	high
220798	Linux Distros Unpatched Vulnerability : CVE-2017-13711	Nessus	Misc.	3/4/2025	8/21/2025	high
138009	EulerOS Virtualization 3.0.6.0 : qemu-kvm (EulerOS-SA-2020-1790)	Nessus	Huawei Local Security Checks	7/1/2020	3/5/2024	critical
180858	Oracle Linux 7 : qemu (ELSA-2018-4289)	Nessus	Oracle Linux Local Security Checks	9/7/2023	11/1/2024	critical
144829	EulerOS Virtualization 3.0.2.6 : qemu (EulerOS-SA-2021-1057)	Nessus	Huawei Local Security Checks	1/11/2021	5/11/2022	critical
108986	RHEL 7 : qemu-kvm (RHSA-2018:0816)	Nessus	Red Hat Local Security Checks	4/11/2018	3/20/2025	high
109511	EulerOS 2.0 SP2 : qemu-kvm (EulerOS-SA-2018-1113)	Nessus	Huawei Local Security Checks	5/2/2018	10/15/2024	high
104376	SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2017:2924-1)	Nessus	SuSE Local Security Checks	11/3/2017	1/6/2021	high
109106	Oracle Linux 7 : qemu-kvm (ELSA-2018-0816)	Nessus	Oracle Linux Local Security Checks	4/18/2018	10/31/2024	high
109372	CentOS 7：qemu-kvm (CESA-2018:0816)	Nessus	CentOS Local Security Checks	4/27/2018	10/22/2024	high
110451	Amazon Linux 2：qemu-kvm (ALAS-2018-1034) (Spectre)	Nessus	Amazon Linux Local Security Checks	6/12/2018	9/24/2024	medium
109070	RHEL 7：Virtualization (RHSA-2018:1104)	Nessus	Red Hat Local Security Checks	4/17/2018	3/20/2025	critical

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