Amazon Linux 2 : qemu-kvm (ALAS-2018-1073)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2018-1073.
#

include("compat.inc");

if (description)
{
  script_id(117589);
  script_version("1.1");
  script_cvs_date("Date: 2018/09/19 10:04:09");

  script_cve_id("CVE-2018-11806", "CVE-2018-7550");
  script_xref(name:"ALAS", value:"2018-1073");

  script_name(english:"Amazon Linux 2 : qemu-kvm (ALAS-2018-1073)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Amazon Linux 2 host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"A heap buffer overflow issue was found in the way SLiRP networking
back-end in QEMU processes fragmented packets. It could occur while
reassembling the fragmented datagrams of an incoming packet. A
privileged user/process inside guest could use this flaw to crash the
QEMU process resulting in DoS or potentially leverage it to execute
arbitrary code on the host with privileges of the QEMU
process.(CVE-2018-11806)

Quick Emulator (QEMU), compiled with the PC System Emulator with
multiboot feature support, is vulnerable to an OOB r/w memory access
issue. The issue could occur while loading a kernel image during the
guest boot, if mh_load_end_addr address is greater than the
mh_bss_end_addr address. A user or process could use this flaw to
potentially achieve arbitrary code execution on a host.(CVE-2018-7550)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/AL2/ALAS-2018-1073.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update qemu-kvm' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-img");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:qemu-kvm-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/09/19");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Amazon Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (rpm_check(release:"AL2", reference:"qemu-img-1.5.3-156.amzn2.5.4")) flag++;
if (rpm_check(release:"AL2", cpu:"x86_64", reference:"qemu-kvm-1.5.3-156.amzn2.5.4")) flag++;
if (rpm_check(release:"AL2", cpu:"x86_64", reference:"qemu-kvm-common-1.5.3-156.amzn2.5.4")) flag++;
if (rpm_check(release:"AL2", reference:"qemu-kvm-debuginfo-1.5.3-156.amzn2.5.4")) flag++;
if (rpm_check(release:"AL2", cpu:"x86_64", reference:"qemu-kvm-tools-1.5.3-156.amzn2.5.4")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "qemu-img / qemu-kvm / qemu-kvm-common / qemu-kvm-debuginfo / etc");
}