Ubuntu: Security Advisory (USN-4628-2)

# SPDX-FileCopyrightText: 2020 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.844711");
  script_cve_id("CVE-2020-8695", "CVE-2020-8696", "CVE-2020-8698");
  script_tag(name:"creation_date", value:"2020-11-12 04:00:35 +0000 (Thu, 12 Nov 2020)");
  script_version("2024-02-02T05:06:07+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:07 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"2.1");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-11-24 15:31:57 +0000 (Tue, 24 Nov 2020)");

  script_name("Ubuntu: Security Advisory (USN-4628-2)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Ubuntu Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/ubuntu_linux", "ssh/login/packages", re:"ssh/login/release=UBUNTU(14\.04\ LTS|16\.04\ LTS|18\.04\ LTS|20\.04\ LTS|20\.10)");

  script_xref(name:"Advisory-ID", value:"USN-4628-2");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-4628-2");
  script_xref(name:"URL", value:"https://launchpad.net/bugs/1903883");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'intel-microcode' package(s) announced via the USN-4628-2 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"USN-4628-1 provided updated Intel Processor Microcode. Unfortunately,
that update prevented certain processors in the Intel Tiger Lake family
from booting successfully. This update reverts the microcode update for
the Tiger Lake processor family.

Please note that the 'dis_ucode_ldr' kernel command line option can be
added in the boot menu to disable microcode loading for system recovery.

We apologize for the inconvenience.

Original advisory details:

 Moritz Lipp, Michael Schwarz, Andreas Kogler, David Oswald, Catherine
 Easdon, Claudio Canella, and Daniel Gruss discovered that the Intel Running
 Average Power Limit (RAPL) feature of some Intel processors allowed a side-
 channel attack based on power consumption measurements. A local attacker
 could possibly use this to expose sensitive information. (CVE-2020-8695)

 Ezra Caltum, Joseph Nuzman, Nir Shildan and Ofir Joseff discovered that
 some Intel(R) Processors did not properly remove sensitive information
 before storage or transfer in some situations. A local attacker could
 possibly use this to expose sensitive information. (CVE-2020-8696)

 Ezra Caltum, Joseph Nuzman, Nir Shildan and Ofir Joseff discovered that
 some Intel(R) Processors did not properly isolate shared resources in some
 situations. A local attacker could possibly use this to expose sensitive
 information. (CVE-2020-8698)");

  script_tag(name:"affected", value:"'intel-microcode' package(s) on Ubuntu 14.04, Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, Ubuntu 20.10.");

  script_tag(name:"solution", value:"Please install the updated package(s).");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-deb.inc");

release = dpkg_get_ssh_release();
if(!release)
  exit(0);

res = "";
report = "";

if(release == "UBUNTU14.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"intel-microcode", ver:"3.20201110.0ubuntu0.14.04.2", rls:"UBUNTU14.04 LTS"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

if(release == "UBUNTU16.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"intel-microcode", ver:"3.20201110.0ubuntu0.16.04.2", rls:"UBUNTU16.04 LTS"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

if(release == "UBUNTU18.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"intel-microcode", ver:"3.20201110.0ubuntu0.18.04.2", rls:"UBUNTU18.04 LTS"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

if(release == "UBUNTU20.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"intel-microcode", ver:"3.20201110.0ubuntu0.20.04.2", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

if(release == "UBUNTU20.10") {

  if(!isnull(res = isdpkgvuln(pkg:"intel-microcode", ver:"3.20201110.0ubuntu0.20.10.2", rls:"UBUNTU20.10"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);