CentOS 7 : libarchive (CESA-2020:0203)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2020:0203 and 
# CentOS Errata and Security Advisory 2020:0203 respectively.
#

include("compat.inc");

if (description)
{
  script_id(133315);
  script_version("1.2");
  script_cvs_date("Date: 2020/02/03");

  script_cve_id("CVE-2019-18408");
  script_xref(name:"RHSA", value:"2020:0203");

  script_name(english:"CentOS 7 : libarchive (CESA-2020:0203)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for libarchive is now available for Red Hat Enterprise Linux
7.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The libarchive programming library can create and read several
different streaming archive formats, including GNU tar, cpio, and ISO
9660 CD-ROM images. Libarchive is used notably in the bsdtar utility,
scripting language bindings such as python-libarchive, and several
popular desktop file managers.

Security Fix(es) :

* libarchive: use-after-free in archive_read_format_rar_read_data when
there is an error in the decompression of an archive entry
(CVE-2019-18408)

For more details about the security issue(s), including the impact, a
CVSS score, acknowledgments, and other related information, refer to
the CVE page(s) listed in the References section."
  );
  # https://lists.centos.org/pipermail/centos-announce/2020-January/035615.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?5324b26e"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libarchive packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-18408");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bsdcpio");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:bsdtar");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libarchive");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libarchive-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/01/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/30");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/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, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"bsdcpio-3.1.2-14.el7_7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"bsdtar-3.1.2-14.el7_7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libarchive-3.1.2-14.el7_7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libarchive-devel-3.1.2-14.el7_7")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, "bsdcpio / bsdtar / libarchive / libarchive-devel");
}