CentOS 7 : ruby (CESA-2019:2028)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:2028 and 
# CentOS Errata and Security Advisory 2019:2028 respectively.
#

include('compat.inc');

if (description)
{
  script_id(128332);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/19");

  script_cve_id(
    "CVE-2017-17742",
    "CVE-2018-6914",
    "CVE-2018-8777",
    "CVE-2018-8778",
    "CVE-2018-8779",
    "CVE-2018-8780",
    "CVE-2018-16396",
    "CVE-2018-1000073",
    "CVE-2018-1000074",
    "CVE-2018-1000075",
    "CVE-2018-1000076",
    "CVE-2018-1000077",
    "CVE-2018-1000078",
    "CVE-2018-1000079"
  );
  script_xref(name:"RHSA", value:"2019:2028");

  script_name(english:"CentOS 7 : ruby (CESA-2019:2028)");

  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 ruby is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Moderate. 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.

Ruby is an extensible, interpreted, object-oriented, scripting
language. It has features to process text files and to perform system
management tasks.

Security Fix(es) :

* ruby: HTTP response splitting in WEBrick (CVE-2017-17742)

* ruby: DoS by large request in WEBrick (CVE-2018-8777)

* ruby: Buffer under-read in String#unpack (CVE-2018-8778)

* ruby: Unintentional directory traversal by poisoned NULL byte in Dir
(CVE-2018-8780)

* ruby: Tainted flags are not propagated in Array#pack and
String#unpack with some directives (CVE-2018-16396)

* rubygems: Path traversal when writing to a symlinked basedir outside
of the root (CVE-2018-1000073)

* rubygems: Unsafe Object Deserialization Vulnerability in gem owner
allowing arbitrary code execution on specially crafted YAML
(CVE-2018-1000074)

* rubygems: Improper verification of signatures in tarball allows to
install mis-signed gem (CVE-2018-1000076)

* rubygems: Missing URL validation on spec home attribute allows
malicious gem to set an invalid homepage URL (CVE-2018-1000077)

* rubygems: XSS vulnerability in homepage attribute when displayed via
gem server (CVE-2018-1000078)

* rubygems: Path traversal issue during gem installation allows to
write to arbitrary filesystem locations (CVE-2018-1000079)

* ruby: Unintentional file and directory creation with directory
traversal in tempfile and tmpdir (CVE-2018-6914)

* ruby: Unintentional socket creation by poisoned NULL byte in
UNIXServer and UNIXSocket (CVE-2018-8779)

* rubygems: Infinite loop vulnerability due to negative size in tar
header causes Denial of Service (CVE-2018-1000075)

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.

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.7 Release Notes linked from the References section.");
  # https://lists.centos.org/pipermail/centos-cr-announce/2019-August/006124.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5ec6901d");
  script_set_attribute(attribute:"solution", value:
"Update the affected ruby packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/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:H/I:H/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-2018-8780");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2018-1000076");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/08/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ruby");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ruby-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ruby-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ruby-irb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ruby-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ruby-tcltk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-bigdecimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-io-console");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-json");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-minitest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-psych");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-rake");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-rdoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygems");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygems-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CentOS Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  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:"ruby-2.0.0.648-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ruby-devel-2.0.0.648-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ruby-doc-2.0.0.648-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ruby-irb-2.0.0.648-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ruby-libs-2.0.0.648-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ruby-tcltk-2.0.0.648-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygem-bigdecimal-1.2.0-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygem-io-console-0.4.2-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygem-json-1.7.7-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygem-minitest-4.3.2-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygem-psych-2.0.0-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygem-rake-0.9.6-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygem-rdoc-4.0.0-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygems-2.0.14.1-36.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"rubygems-devel-2.0.14.1-36.el7")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ruby / ruby-devel / ruby-doc / ruby-irb / ruby-libs / ruby-tcltk / etc");
}