usn-3756-1
Vulnerability from osv_ubuntu
Published
2018-08-27 18:48
Modified
2026-06-03 10:45
Summary
intel-microcode vulnerabilities
Details

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646)

Jann Horn and Ken Johnson discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via a sidechannel attack. This flaw is known as Spectre Variant 4. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2018-3639)

Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy discovered that microprocessors that perform speculative reads of system registers may allow unauthorized disclosure of system parameters via a sidechannel attack. This vulnerability is also known as Rogue System Register Read (RSRE). An attacker could use this to expose sensitive information. (CVE-2018-3640)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-3639",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3640",
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                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3646",
              "severity": [
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                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
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                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "intel-microcode",
            "binary_version": "3.20180807a.0ubuntu0.14.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "intel-microcode",
        "purl": "pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.14.04.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
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            },
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        "1.20130906.1ubuntu3",
        "2.20140122.1",
        "2.20140430.1ubuntu1",
        "2.20140624-t-1ubuntu2",
        "3.20180108.0~ubuntu14.04.2",
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        "3.20180312.0~ubuntu14.04.1",
        "3.20180425.1~ubuntu0.14.04.1",
        "3.20180425.1~ubuntu0.14.04.2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-3639",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3640",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3646",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
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                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "intel-microcode",
            "binary_version": "3.20180807a.0ubuntu0.16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "intel-microcode",
        "purl": "pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.16.04.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.20180807a.0ubuntu0.16.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
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        "3.20151106.1",
        "3.20170707.1~ubuntu16.04.0",
        "3.20180108.0~ubuntu16.04.2",
        "3.20180108.0+really20170707ubuntu16.04.1",
        "3.20180312.0~ubuntu16.04.1",
        "3.20180425.1~ubuntu0.16.04.1",
        "3.20180425.1~ubuntu0.16.04.2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2018-3639",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3640",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2018-3646",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "intel-microcode",
            "binary_version": "3.20180807a.0ubuntu0.18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "intel-microcode",
        "purl": "pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.20180807a.0ubuntu0.18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.20170707.1",
        "3.20171117.1",
        "3.20180108.1",
        "3.20180108.1+really20171117.1",
        "3.20180312.0~ubuntu18.04.1",
        "3.20180425.1~ubuntu0.18.04.1",
        "3.20180425.1~ubuntu0.18.04.2"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that memory present in the L1 data cache of an Intel CPU\ncore may be exposed to a malicious process that is executing on the CPU\ncore. This vulnerability is also known as L1 Terminal Fault (L1TF). A local\nattacker in a guest virtual machine could use this to expose sensitive\ninformation (memory from other guests or the host OS). (CVE-2018-3646)\n\nJann Horn and Ken Johnson discovered that microprocessors utilizing\nspeculative execution of a memory read may allow unauthorized memory reads\nvia a sidechannel attack. This flaw is known as Spectre Variant 4. A local\nattacker could use this to expose sensitive information, including kernel\nmemory. (CVE-2018-3639)\n\nZdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy\ndiscovered that microprocessors that perform speculative reads of\nsystem registers may allow unauthorized disclosure of system parameters\nvia a sidechannel attack. This vulnerability is also known as Rogue\nSystem Register Read (RSRE). An attacker could use this to expose\nsensitive information. (CVE-2018-3640)\n",
  "id": "USN-3756-1",
  "modified": "2026-06-03T10:45:17Z",
  "published": "2018-08-27T18:48:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-3756-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3639"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3640"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-3646"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "intel-microcode vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2018-3639",
    "UBUNTU-CVE-2018-3640",
    "UBUNTU-CVE-2018-3646"
  ]
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.