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CVE-2019-18421

Description
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations. There are issues with restartable PV type change operations. To avoid using shadow pagetables for PV guests, Xen exposes the actual hardware pagetables to the guest. In order to prevent the guest from modifying these page tables directly, Xen keeps track of how pages are used using a type system; pages must be "promoted" before being used as a pagetable, and "demoted" before being used for any other type. Xen also allows for "recursive" promotions: i.e., an operating system promoting a page to an L4 pagetable may end up causing pages to be promoted to L3s, which may in turn cause pages to be promoted to L2s, and so on. These operations may take an arbitrarily large amount of time, and so must be re-startable. Unfortunately, making recursive pagetable promotion and demotion operations restartable is incredibly complicated, and the code contains several races which, if triggered, can cause Xen to drop or retain extra type counts, potentially allowing guests to get write access to in-use pagetables. A malicious PV guest administrator may be able to escalate their privilege to that of the host. All x86 systems with untrusted PV guests are vulnerable. HVM and PVH guests cannot exercise this vulnerability.
  • Risk: 75
CVSSv3
    CVSSv2

      Packages

      NameTypeArchSizeRisk
      libxenstore3.0
      libxenstore3.0_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb
      libxen-4.8
      libxen-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb
      xen-utils-4.8
      xen-utils-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb
      libxenstore3.0
      libxenstore3.0_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb
      xen-system-amd64
      xen-system-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb
      libxen-dev
      libxen-dev_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb
      xenstore-utils
      xenstore-utils_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb
      libxen-dev
      libxen-dev_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb
      xen-system-amd64
      xen-system-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb
      xen-hypervisor-4.8-amd64
      xen-hypervisor-4.8-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb
      libxen-4.8
      libxen-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb
      xen-hypervisor-4.8-amd64
      xen-hypervisor-4.8-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb
      xenstore-utils
      xenstore-utils_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb
      xen-utils-common
      xen-utils-common_4.8.5+shim4.10.2+xsa282-1+deb9u11_all.deb
      xen-utils-4.8
      xen-utils-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb
      libxendevicemodel1
      libxendevicemodel1_4.11.1+92-g6c33308a8d-2_i386.deb
      xenstore-utils
      xenstore-utils_4.11.1+92-g6c33308a8d-2_i386.deb
      xen-system-amd64
      xen-system-amd64_4.11.1+92-g6c33308a8d-2_amd64.deb
      xen-hypervisor-4.11-amd64
      xen-hypervisor-4.11-amd64_4.11.1+92-g6c33308a8d-2_amd64.deb
      xen-utils-common
      xen-utils-common_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxenevtchn1
      libxenevtchn1_4.11.1+92-g6c33308a8d-2_i386.deb
      xen-utils-common
      xen-utils-common_4.11.1+92-g6c33308a8d-2_i386.deb
      libxen-dev
      libxen-dev_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxenforeignmemory1
      libxenforeignmemory1_4.11.1+92-g6c33308a8d-2_i386.deb
      libxen-dev
      libxen-dev_4.11.1+92-g6c33308a8d-2_i386.deb
      libxenstore3.0
      libxenstore3.0_4.11.1+92-g6c33308a8d-2_i386.deb
      xen-utils-4.11
      xen-utils-4.11_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxencall1
      libxencall1_4.11.1+92-g6c33308a8d-2_i386.deb
      xen-doc
      xen-doc_4.11.1+92-g6c33308a8d-2_i386.deb
      libxenmisc4.11
      libxenmisc4.11_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxenforeignmemory1
      libxenforeignmemory1_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxenevtchn1
      libxenevtchn1_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxenmisc4.11
      libxenmisc4.11_4.11.1+92-g6c33308a8d-2_i386.deb
      libxentoolcore1
      libxentoolcore1_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxentoollog1
      libxentoollog1_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxendevicemodel1
      libxendevicemodel1_4.11.1+92-g6c33308a8d-2_amd64.deb
      xenstore-utils
      xenstore-utils_4.11.1+92-g6c33308a8d-2_amd64.deb
      xen-hypervisor-common
      xen-hypervisor-common_4.11.1+92-g6c33308a8d-2_all.deb
      xen-utils-4.11
      xen-utils-4.11_4.11.1+92-g6c33308a8d-2_i386.deb
      libxentoollog1
      libxentoollog1_4.11.1+92-g6c33308a8d-2_i386.deb
      xen-doc
      xen-doc_4.11.1+92-g6c33308a8d-2_amd64.deb
      xen-hypervisor-4.11-amd64
      xen-hypervisor-4.11-amd64_4.11.1+92-g6c33308a8d-2_i386.deb
      libxencall1
      libxencall1_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxenstore3.0
      libxenstore3.0_4.11.1+92-g6c33308a8d-2_amd64.deb
      libxentoolcore1
      libxentoolcore1_4.11.1+92-g6c33308a8d-2_i386.deb
      libxengnttab1
      libxengnttab1_4.11.1+92-g6c33308a8d-2_i386.deb
      xen-system-amd64
      xen-system-amd64_4.11.1+92-g6c33308a8d-2_i386.deb
      libxengnttab1
      libxengnttab1_4.11.1+92-g6c33308a8d-2_amd64.deb

      Raw Object

      {
        "uuid": "17427f0d-570d-7216-405a-470667705452",
        "name": "CVE-2019-18421",
        "description": "An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations. There are issues with restartable PV type change operations. To avoid using shadow pagetables for PV guests, Xen exposes the actual hardware pagetables to the guest. In order to prevent the guest from modifying these page tables directly, Xen keeps track of how pages are used using a type system; pages must be \"promoted\" before being used as a pagetable, and \"demoted\" before being used for any other type. Xen also allows for \"recursive\" promotions: i.e., an operating system promoting a page to an L4 pagetable may end up causing pages to be promoted to L3s, which may in turn cause pages to be promoted to L2s, and so on. These operations may take an arbitrarily large amount of time, and so must be re-startable. Unfortunately, making recursive pagetable promotion and demotion operations restartable is incredibly complicated, and the code contains several races which, if triggered, can cause Xen to drop or retain extra type counts, potentially allowing guests to get write access to in-use pagetables. A malicious PV guest administrator may be able to escalate their privilege to that of the host. All x86 systems with untrusted PV guests are vulnerable. HVM and PVH guests cannot exercise this vulnerability.",
        "cvss": null,
        "score": 7.1,
        "severity": "HIGH",
        "cvss3": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "score3": 7.5,
        "severity3": "HIGH",
        "applications": [],
        "packages": [
          {
            "uuid": "61dd0892-5f98-90ab-721a-f24ab691839e",
            "sha256": "b2d3ce8f5048a5791a8cee39606568e233116dad83a5ea7dbc8508c2f902c99a",
            "sha1": "4c1e6bb0281d3f06d780532c9f05310004eb43d2",
            "md5": "4ba6e69b8edbbc84dd104aea5466da2e",
            "name": "libxenstore3.0",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "libxenstore3.0_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/b2d3ce8f5048a5791a8cee39606568e233116dad83a5ea7dbc8508c2f902c99a"
          },
          {
            "uuid": "a10b4b61-b660-7538-0c88-cc2ea99b1a39",
            "sha256": "b3c6a96c9f6fbcb3d8b20dd81ad8ace42ada1c9dcd81a06f74e6a63bffceb727",
            "sha1": "26724416f5e201062ad56cd22d3768816cbd714c",
            "md5": "aa6990fc381a31b426ba740bdeb97370",
            "name": "libxen-4.8",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "libxen-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/b3c6a96c9f6fbcb3d8b20dd81ad8ace42ada1c9dcd81a06f74e6a63bffceb727"
          },
          {
            "uuid": "d69c3613-e8e5-cea3-6f12-11769303c2ec",
            "sha256": "a75523c097c6f401fa341b912ff26e0dacac56e176931ef1df04de7fc4745b37",
            "sha1": "88068deb6303050351c4b4117b623f03e498f439",
            "md5": "6b5a1323c0ef78f77ad38f14c33bb6a6",
            "name": "xen-utils-4.8",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "xen-utils-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/a75523c097c6f401fa341b912ff26e0dacac56e176931ef1df04de7fc4745b37"
          },
          {
            "uuid": "8171f1e7-38c1-ac67-e51d-5cc02fda90d0",
            "sha256": "a1c63d71f68dee29cd9d864c9b3920e86098bf08691fcdfb1d761c95821531df",
            "sha1": "4984202f127408884d9f6652050fc979d966950b",
            "md5": "ece8df254d3091b89f16a08b35f80dff",
            "name": "libxenstore3.0",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "libxenstore3.0_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/a1c63d71f68dee29cd9d864c9b3920e86098bf08691fcdfb1d761c95821531df"
          },
          {
            "uuid": "d59a8abd-caaf-4289-0625-114d1bcdc963",
            "sha256": "9e2cf01bcd6c371f725eb6bddf4a3b64376d445b8983baa71a0d73a77d204573",
            "sha1": "8e1220a0c5a9881c775c23d894520738a053e6b7",
            "md5": "d19c046ec15eecb46ae9a0448fd88030",
            "name": "xen-system-amd64",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "xen-system-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/9e2cf01bcd6c371f725eb6bddf4a3b64376d445b8983baa71a0d73a77d204573"
          },
          {
            "uuid": "04b1702f-47eb-2cae-f1ca-e0a6f6cf9edc",
            "sha256": "de4b4c9ecb2a149c9371ba72eec5ab0b4a70a06d25abd867d51bf0f4cdf19e5e",
            "sha1": "53c1dbba69d63adb19698eb10c7007c8b0206eb2",
            "md5": "1629f750ce522149498205fe605fd6f3",
            "name": "libxen-dev",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "libxen-dev_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/de4b4c9ecb2a149c9371ba72eec5ab0b4a70a06d25abd867d51bf0f4cdf19e5e"
          },
          {
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            "md5": "55aa222bdfc692b13788fbc79aa5d7d1",
            "name": "xenstore-utils",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "xenstore-utils_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/0138e5e7140e37c79535668e442f8dbc9db63405d0df6e92972991a79dd2e008"
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          {
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            "md5": "3eb38c0088a4728cec35f7f97e5001a0",
            "name": "libxen-dev",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "libxen-dev_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/4996361eef8b33766dfe0bcb1ab6e6001aa1a152812c23d1be9334f254cb7eeb"
          },
          {
            "uuid": "fdf86755-9451-8870-d1df-381fd3ab07d5",
            "sha256": "3f004471a877637e4b0abdc7f4886ae3dea605e324fde6de350bea99729ea7f6",
            "sha1": "a82d28cd63d861683d4ce3d629690741a861ac81",
            "md5": "4ac7f4e0706238fc718566e7bb7cc409",
            "name": "xen-system-amd64",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "xen-system-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/3f004471a877637e4b0abdc7f4886ae3dea605e324fde6de350bea99729ea7f6"
          },
          {
            "uuid": "264b16f8-73c8-bc20-58b8-5779d5563823",
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            "md5": "b43f70544da172ef6372a0b8d6e0b868",
            "name": "xen-hypervisor-4.8-amd64",
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            "filename": "xen-hypervisor-4.8-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_amd64.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/d824474d508ce4cf75dea2ad18ce1bd84c85f7c61d76e081513552636c739cc2"
          },
          {
            "uuid": "d5955b63-86ec-2666-d6b0-10925ddf6551",
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            "sha1": "e2c62de4ad7241d13302a138897a1fd2fd96553e",
            "md5": "1c7a31d2dfeaf9595d455cccec755437",
            "name": "libxen-4.8",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "libxen-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/88ff46f987fa7bfffe148d4637af9d3bde25d7cdb6fa5f861d1005c1e110ef06"
          },
          {
            "uuid": "5f45ae4b-60e4-e23e-d2d0-2bb8bc86fabc",
            "sha256": "2732f4d2cc00cc0ec787ca8db783a14473a3ecac277f681ba3447a3f31c709c2",
            "sha1": "f09ecb41f45b088d5a32430dcc97b8bd476a907f",
            "md5": "2c3f41461cd52074adfb25333ae6417e",
            "name": "xen-hypervisor-4.8-amd64",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "xen-hypervisor-4.8-amd64_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/2732f4d2cc00cc0ec787ca8db783a14473a3ecac277f681ba3447a3f31c709c2"
          },
          {
            "uuid": "cde86c18-0a1e-8c5a-b1f2-e2d66fb35705",
            "sha256": "10bbf91c48e2106c8acf79ba364fc374d4f42bad4c45732a2c0a52b01e3654c4",
            "sha1": "efe5b45229b188c57b72cbeedb098528b9966c61",
            "md5": "168ab7d36bfbae60e44a527b729e0be6",
            "name": "xenstore-utils",
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            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/10bbf91c48e2106c8acf79ba364fc374d4f42bad4c45732a2c0a52b01e3654c4"
          },
          {
            "uuid": "e07a35e3-9955-33f2-34d8-38cb6d3d9b1d",
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            "sha1": "eb78b17c2f6466c0553feb3eea5efcf1734bf3de",
            "md5": "166c56e16ab0847af7580b10060de50e",
            "name": "xen-utils-common",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "xen-utils-common_4.8.5+shim4.10.2+xsa282-1+deb9u11_all.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/bd8069595f816582a61c11b29c17af8b24638832ef1d676819db77791ee856d0"
          },
          {
            "uuid": "0fd92e6f-2966-c543-d632-cebdfe52d9f0",
            "sha256": "a172b23c792f5b71a5c0815b41c11dbe94b80b6085a7b4ebd634b38518ac78ef",
            "sha1": "b09d392b8eb23fe5b04c49c3677fb5f128ada015",
            "md5": "edc4aa84561486eb74606677df3041eb",
            "name": "xen-utils-4.8",
            "version": "4.8.5+shim4.10.2+xsa282-1+deb9u11",
            "filename": "xen-utils-4.8_4.8.5+shim4.10.2+xsa282-1+deb9u11_i386.deb",
            "source": "DSA",
            "sid": "DSA-4602-1",
            "self": "https://data.zercurity.com/v1/package/a172b23c792f5b71a5c0815b41c11dbe94b80b6085a7b4ebd634b38518ac78ef"
          },
          {
            "uuid": "eec1163a-f8d8-d7ef-99de-e2bf3f3a05c8",
            "sha256": "70edbf3e15182958380e7103d191715ced336f2536f29fc67c9936da862bdc9e",
            "sha1": "fbcc7966ed3943d6e71e80dd866d8db2d5dc97a1",
            "md5": "355b699077d8311a093251c975e8eab2",
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