xen のこの更新は、いくつかの問題を修正します。これらのセキュリティの問題が修正されました：

  - CVE-2016-9637：ioport配列オーバーフローにより、悪意のあるゲスト管理者が、権限をホストの権限に昇格する可能性があります（bsc#1011652）

  - CVE-2016-9386：x86 nullセグメントが常に使用できないとして扱われるとは限らないために、権限のないゲストユーザープログラムが、その権限をゲストオペレーティングシステムの権限に昇格できる場合があります。この脆弱性はIntelでは容易に悪用できますが、AMDでは複雑です（bsc#1009100）

  - CVE-2016-9382：x86タスクの VM86 モードへの切り替えが不適切に処理されてたために、権限のないゲストプロセスが、その権限をAMDハードウェアのゲストオペレーティングシステムの権限に昇格でいる可能性があります。Intelハードウェアで悪意のある権限のないゲストプロセスが、ゲストをクラッシュさせる可能性があります（bsc#1009103）

  - CVE-2016-9383：x86 64ビットビットテスト命令エミュレーションが機能しないために、ゲストが任意のメモリを変更し、その結果任意のコード実行が行われる可能性がありました（bsc#1009107）

  - CVE-2016-9381：共有リングの不適切な処理により、ゲスト管理者がqemuプロセスを乗っ取り、権限をqemuプロセスの権限に昇格させることができました（bsc#1009109）

  - CVE-2016-9380：pygrubのデリミタインジェクションの脆弱性により、ゲスト管理者が、機密性の高いホストファイルのコンテンツを取得したり、ファイルを削除したりすることが可能でした（bsc#1009111）

  - CVE-2016-9379：pygrubのデリミタインジェクションの脆弱性により、ゲスト管理者が、機密性の高いホストファイルのコンテンツを取得したり、ファイルを削除したりすることが可能でした（bsc#1009111）

  - CVE-2016-7777：XenはCR0.TSおよびCR0.EMに適切に準拠していません。これにより、ローカルx86 HVMゲストOSユーザーが、ハイパーバイザーのエミュレーションを準備しているときに命令を変更することにより、ゲスト上の任意のタスクに属するFPU、MMX、または XMMレジスタの状態情報を読み取るか変更する可能性があります（bsc#1000106）

  - CVE-2016-8910：hw/net/rtl8139.cにあるrtl8139_cplus_transmit関数により、ローカルのゲストOS管理者が、リングディスクリプタ数を制限できないことを悪用して、サービス拒否（無限ループおよびCPU消費）を引き起こすことが可能で（bsc#1007157）

  - CVE-2016-8909：hw/audio/intel-hda.cにあるintel_hda_xfer関数により、ローカルのゲストOS管理者が、バッファ長とポインター位置に同じ値が設定されているエントリによって、サービス拒否（無限ループとCPU消費）を引き起こすことが可能です（bsc#1007160）

  - CVE-2016-8667：hw/dma/rc4030.cにあるrc4030_write関数により、ローカルのゲストOS管理者が、大きなインターバルタイマーリロード値によって、サービス拒否（ゼロ除算エラーおよびQEMUプロセスのクラッシュ）を引き起こすことが可能です（bsc#1005004）

  - CVE-2016-8669：hw/char/serial.cにあるserial_update_parameters関数により、ローカルのゲストOS管理者が、ボーベースより大きいdividerの値に関するベクトルを介して、サービス拒否（ゼロ除算エラーおよびQEMUプロセスのクラッシュ）を引き起こすことが可能です（bsc#1005005）

  - CVE-2016-7908：hw/net/mcf_fec.cにあるmcf_fec_do_tx関数は、パケットの送信時にバッファ記述子カウントを適切に制限しません。これにより、ローカルゲストOS管理者は、長さ0のバッファ記述子およびbd.flagsの細工された値を含むベクトルを介してサービス拒否（無限ループおよびQEMUプロセスクラッシュ）を引き起こす可能性があります（bsc#1003030）

  - CVE-2016-7909：hw/net/pcnet.cにあるpcnet_rdra_addr関数により、ローカルのゲストOS管理者が、（1）が受信または（2）送信ディスクリプタリングの長さを0に設定することで、サービス拒否（無限ループとQEMUプロセスのクラッシュ）を引き起こすことが可能です（bsc#1003032）

更新パッケージには、セキュリティ関連以外の修正も含まれています。詳細については、アドバイザリを参照してください。

注意：Tenable Network Securityは、前述の記述ブロックをSUSEセキュリティアドバイザリから直接抽出しています。Tenableでは、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

Xenハイパーバイザーに複数の脆弱性が発見されました。これは、権限昇格につながる可能性があります。

Debian 7「Wheezy」では、これらの問題はバージョン4.1.6.lts1-12で修正されています。

お使いの xen パッケージをアップグレードすることを推奨します。

注意: パッチがバックポートするには侵入的すぎるため、CVE-2017-15590（XSA-237）はwheezyで修正*されません*。物理デバイスを信頼できないゲストにパススルーしないことで、この脆弱性を緩和できます。詳細については、https://xenbits.xen.org/xsa/advisory-237.htmlを参照してください

注: Tenable Network Securityは、前述の記述ブロックを DLA セキュリティアドバイザリから直接抽出しています。Tenableでは、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

The remote OracleVM system is missing necessary patches to address critical security updates :

  - qemu_up: ioport_read, ioport_write: be defensive about     32-bit addresses On x86, ioport addresses are 16-bit.
    That these functions take 32-bit arguments is a mistake.
    Changing the argument type to 16-bit will discard the     top bits of any erroneous values from elsewhere in qemu.
    Also, check just before use that the value is in range.
    (This turns an ill-advised change to MAX_IOPORTS into a     possible guest crash rather than a privilege escalation     vulnerability.) And, in the Xen ioreq processor, clamp     incoming ioport addresses to 16-bit values. Xen will     never write >16-bit values but the guest may have access     to the ioreq ring. We want to defend the rest of the     qemu code from wrong values. This is XSA-199.
    (CVE-2016-9637)

  - qemu: ioport_read, ioport_write: be defensive about     32-bit addresses On x86, ioport addresses are 16-bit.
    That these functions take 32-bit arguments is a mistake.
    Changing the argument type to 16-bit will discard the     top bits of any erroneous values from elsewhere in qemu.
    Also, check just before use that the value is in range.
    (This turns an ill-advised change to MAX_IOPORTS into a     possible guest crash rather than a privilege escalation     vulnerability.) And, in the Xen ioreq processor, clamp     incoming ioport addresses to 16-bit values. Xen will     never write >16-bit values but the guest may have access     to the ioreq ring. We want to defend the rest of the     qemu code from wrong values. This is XSA-199.
    (CVE-2016-9637)

An update for xen is now available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Xen is a virtual machine monitor

Security Fix(es) :

* An out of bounds array access issue was found in the Xen virtual machine monitor, built with the QEMU ioport support. It could occur while doing ioport read/write operations, if guest was to supply a 32bit address parameter. A privileged guest user/process could use this flaw to potentially escalate their privileges on a host.
(CVE-2016-9637)

Red Hat would like to thank the Xen project for reporting this issue.

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.

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

  - CVE-2016-9637: ioport array overflow allowing a     malicious guest administrator can escalate their     privilege to that of the host (bsc#1011652).

  - CVE-2016-9386: x86 null segments were not always treated     as unusable allowing an unprivileged guest user program     to elevate its privilege to that of the guest operating     system. Exploit of this vulnerability is easy on Intel     and more complicated on AMD (bsc#1009100)

  - CVE-2016-9382: x86 task switch to VM86 mode was     mis-handled, allowing a unprivileged guest process to     escalate its privilege to that of the guest operating     system on AMD hardware. On Intel hardware a malicious     unprivileged guest process can crash the guest     (bsc#1009103)

  - CVE-2016-9383: The x86 64-bit bit test instruction     emulation was broken, allowing a guest to modify     arbitrary memory leading to arbitray code execution     (bsc#1009107)

  - 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-2016-9380: Delimiter injection vulnerabilities in     pygrub allowed guest administrators to obtain the     contents of sensitive host files or delete the files     (bsc#1009111)

  - CVE-2016-9379: Delimiter injection vulnerabilities in     pygrub allowed guest administrators to obtain the     contents of sensitive host files or delete the files     (bsc#1009111)

  - CVE-2016-7777: Xen did not properly honor CR0.TS and     CR0.EM, which allowed local x86 HVM guest OS users to     read or modify FPU, MMX, or XMM register state     information belonging to arbitrary tasks on the guest by     modifying an instruction while the hypervisor is     preparing to emulate it (bsc#1000106)

  - CVE-2016-8910: The rtl8139_cplus_transmit function in     hw/net/rtl8139.c allowed local guest OS administrators     to cause a denial of service (infinite loop and CPU     consumption) by leveraging failure to limit the ring     descriptor count (bsc#1007157)

  - CVE-2016-8667: The rc4030_write function in     hw/dma/rc4030.c in allowed local guest OS administrators     to cause a denial of service (divide-by-zero error and     QEMU process crash) via a large interval timer reload     value (bsc#1005004)

  - CVE-2016-8669: The serial_update_parameters function in     hw/char/serial.c allowed local guest OS administrators     to cause a denial of service (divide-by-zero error and     QEMU process crash) via vectors involving a value of     divider greater than baud base (bsc#1005005)

  - CVE-2016-7908: The mcf_fec_do_tx function in     hw/net/mcf_fec.c did not properly limit the buffer     descriptor count when transmitting packets, which     allowed 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 (bsc#1003030)

  - CVE-2016-7909: The pcnet_rdra_addr function in     hw/net/pcnet.c allowed local guest OS administrators to     cause a denial of service (infinite loop and QEMU     process crash) by setting the (1) receive or (2)     transmit descriptor ring length to 0 (bsc#1003032)

  - CVE-2016-6351: The esp_do_dma function in hw/scsi/esp.c,     when built with ESP/NCR53C9x controller emulation     support, allowed local guest OS administrators to cause     a denial of service (out-of-bounds write and QEMU     process crash) or execute arbitrary code on the host via     vectors involving DMA read into ESP command buffer     (bsc#990843)

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.

This update for xen fixes several issues. These security issues were fixed :

  - CVE-2016-9637: ioport array overflow allowing a     malicious guest administrator can escalate their     privilege to that of the host (bsc#1011652)

  - CVE-2016-9386: x86 null segments were not always treated     as unusable allowing an unprivileged guest user program     to elevate its privilege to that of the guest operating     system. Exploit of this vulnerability is easy on Intel     and more complicated on AMD (bsc#1009100)

  - CVE-2016-9382: x86 task switch to VM86 mode was     mis-handled, allowing a unprivileged guest process to     escalate its privilege to that of the guest operating     system on AMD hardware. On Intel hardware a malicious     unprivileged guest process can crash the guest     (bsc#1009103)

  - CVE-2016-9385: x86 segment base write emulation lacked     canonical address checks, allowing a malicious guest     administrator to crash the host (bsc#1009104)

  - CVE-2016-9383: The x86 64-bit bit test instruction     emulation was broken, allowing a guest to modify     arbitrary memory leading to arbitray code execution     (bsc#1009107)

  - 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-2016-9380: Delimiter injection vulnerabilities in     pygrub allowed guest administrators to obtain the     contents of sensitive host files or delete the files     (bsc#1009111)

  - CVE-2016-9379: Delimiter injection vulnerabilities in     pygrub allowed guest administrators to obtain the     contents of sensitive host files or delete the files     (bsc#1009111)

  - CVE-2016-7777: Xen did not properly honor CR0.TS and     CR0.EM, which allowed local x86 HVM guest OS users to     read or modify FPU, MMX, or XMM register state     information belonging to arbitrary tasks on the guest by     modifying an instruction while the hypervisor is     preparing to emulate it (bsc#1000106)

  - CVE-2016-8910: The rtl8139_cplus_transmit function in     hw/net/rtl8139.c allowed local guest OS administrators     to cause a denial of service (infinite loop and CPU     consumption) by leveraging failure to limit the ring     descriptor count (bsc#1007157)

  - CVE-2016-8909: The intel_hda_xfer function in     hw/audio/intel-hda.c allowed local guest OS     administrators to cause a denial of service (infinite     loop and CPU consumption) via an entry with the same     value for buffer length and pointer position     (bsc#1007160)

  - CVE-2016-8667: The rc4030_write function in     hw/dma/rc4030.c in allowed local guest OS administrators     to cause a denial of service (divide-by-zero error and     QEMU process crash) via a large interval timer reload     value (bsc#1005004)

  - CVE-2016-8669: The serial_update_parameters function in     hw/char/serial.c allowed local guest OS administrators     to cause a denial of service (divide-by-zero error and     QEMU process crash) via vectors involving a value of     divider greater than baud base (bsc#1005005)

  - CVE-2016-8576: The xhci_ring_fetch function in     hw/usb/hcd-xhci.c allowed local guest OS administrators     to cause a denial of service (infinite loop and QEMU     process crash) by leveraging failure to limit the number     of link Transfer Request Blocks (TRB) to process     (bsc#1004016)

  - CVE-2016-7908: The mcf_fec_do_tx function in     hw/net/mcf_fec.c did not properly limit the buffer     descriptor count when transmitting packets, which     allowed 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 (bsc#1003030)

  - CVE-2016-7909: The pcnet_rdra_addr function in     hw/net/pcnet.c allowed local guest OS administrators to     cause a denial of service (infinite loop and QEMU     process crash) by setting the (1) receive or (2)     transmit descriptor ring length to 0 (bsc#1003032)

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.

The remote host is affected by the vulnerability described in GLSA-201612-56 (Xen: Multiple vulnerabilities)

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

    A local attacker could possibly execute arbitrary code with the       privileges of the process, could gain privileges on the host system,       cause a Denial of Service condition, or obtain sensitive information.
  Workaround :

    There is no known workaround at this time.

ID	名前	製品	ファミリー	公開日	更新日	深刻度
96150	SUSE SLES11セキュリティ更新プログラム：xen （SUSE-SU-2016:3273-1）	Nessus	SuSE Local Security Checks	2016/12/27	2021/1/19	high
106633	Debian DLA-1270-1: xen セキュリティ更新	Nessus	Debian Local Security Checks	2018/2/7	2025/10/30	critical
95618	OracleVM 3.3 : xen (OVMSA-2016-0171)	Nessus	OracleVM Local Security Checks	2016/12/8	2021/1/4	high
95953	CentOS 5 : xen (CESA-2016:2963)	Nessus	CentOS Local Security Checks	2016/12/21	2025/2/18	high
96025	Fedora 23 : xen (2016-cc2916dcf4)	Nessus	Fedora Local Security Checks	2016/12/20	2021/1/11	high
95624	SUSE SLES11 Security Update : xen (SUSE-SU-2016:3044-1)	Nessus	SuSE Local Security Checks	2016/12/8	2021/1/19	high
95822	SUSE SLES12 Security Update : xen (SUSE-SU-2016:3156-1)	Nessus	SuSE Local Security Checks	2016/12/14	2021/1/6	high
96231	GLSA-201612-56 : Xen: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2017/1/3	2021/1/11	high

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