Fedora 25 : xen (2016-999e1a6927)

2016-12-05T00:00:00
ID FEDORA_2016-999E1A6927.NASL
Type nessus
Reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-05-02T00:00:00

Description

xen : various security flaws (#1397383) x86 null segments not always treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86 mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write emulation lacking canonical address checks [XSA-193, CVE-2016-9385] guest 32-bit ELF symbol table load leaking host data [XSA-194, CVE-2016-9384] x86 64-bit bit test instruction emulation broken [XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled [XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared ring processing [XSA-197, CVE-2016-9381] delimiter injection vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380]

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory FEDORA-2016-999e1a6927.
#

include("compat.inc");

if (description)
{
  script_id(95493);
  script_version("3.5");
  script_cvs_date("Date: 2019/09/25 17:12:09");

  script_cve_id("CVE-2016-9377", "CVE-2016-9378", "CVE-2016-9379", "CVE-2016-9380", "CVE-2016-9381", "CVE-2016-9382", "CVE-2016-9383", "CVE-2016-9384", "CVE-2016-9385", "CVE-2016-9386");
  script_xref(name:"FEDORA", value:"2016-999e1a6927");

  script_name(english:"Fedora 25 : xen (2016-999e1a6927)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"xen : various security flaws (#1397383) x86 null segments not always
treated as unusable [XSA-191, CVE-2016-9386] x86 task switch to VM86
mode mis-handled [XSA-192, CVE-2016-9382] x86 segment base write
emulation lacking canonical address checks [XSA-193, CVE-2016-9385]
guest 32-bit ELF symbol table load leaking host data [XSA-194,
CVE-2016-9384] x86 64-bit bit test instruction emulation broken
[XSA-195, CVE-2016-9383] x86 software interrupt injection mis-handled
[XSA-196, CVE-2016-9377, CVE-2016-9378] qemu incautious about shared
ring processing [XSA-197, CVE-2016-9381] delimiter injection
vulnerabilities in pygrub [XSA-198, CVE-2016-9379, CVE-2016-9380]

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."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bodhi.fedoraproject.org/updates/FEDORA-2016-999e1a6927"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected xen package.");
  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:fedoraproject:fedora:xen");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:25");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/01/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/05");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^25([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 25", "Fedora " + os_ver);

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


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);


flag = 0;
if (rpm_check(release:"FC25", reference:"xen-4.7.1-3.fc25")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xen");
}