RHEL 7 : ruby (RHSA-2018:0378)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2018:0378. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(107082);
  script_version("3.11");
  script_cvs_date("Date: 2019/10/24 15:35:44");

  script_cve_id("CVE-2017-0898", "CVE-2017-0899", "CVE-2017-0900", "CVE-2017-0901", "CVE-2017-0902", "CVE-2017-0903", "CVE-2017-10784", "CVE-2017-14033", "CVE-2017-14064", "CVE-2017-17405", "CVE-2017-17790");
  script_xref(name:"RHSA", value:"2018:0378");

  script_name(english:"RHEL 7 : ruby (RHSA-2018:0378)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat 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 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.

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) :

* It was discovered that the Net::FTP module did not properly process
filenames in combination with certain operations. A remote attacker
could exploit this flaw to execute arbitrary commands by setting up a
malicious FTP server and tricking a user or Ruby application into
downloading files with specially crafted names using the Net::FTP
module. (CVE-2017-17405)

* A buffer underflow was found in ruby's sprintf function. An
attacker, with ability to control its format string parameter, could
send a specially crafted string that would disclose heap memory or
crash the interpreter. (CVE-2017-0898)

* It was found that rubygems did not sanitize gem names during
installation of a given gem. A specially crafted gem could use this
flaw to install files outside of the regular directory.
(CVE-2017-0901)

* A vulnerability was found where rubygems did not sanitize DNS
responses when requesting the hostname of the rubygems server for a
domain, via a _rubygems._tcp DNS SRV query. An attacker with the
ability to manipulate DNS responses could direct the gem command
towards a different domain. (CVE-2017-0902)

* A vulnerability was found where the rubygems module was vulnerable
to an unsafe YAML deserialization when inspecting a gem. Applications
inspecting gem files without installing them can be tricked to execute
arbitrary code in the context of the ruby interpreter. (CVE-2017-0903)

* It was found that WEBrick did not sanitize all its log messages. If
logs were printed in a terminal, an attacker could interact with the
terminal via the use of escape sequences. (CVE-2017-10784)

* It was found that the decode method of the OpenSSL::ASN1 module was
vulnerable to buffer underrun. An attacker could pass a specially
crafted string to the application in order to crash the ruby
interpreter, causing a denial of service. (CVE-2017-14033)

* A vulnerability was found where rubygems did not properly sanitize
gems' specification text. A specially crafted gem could interact with
the terminal via the use of escape sequences. (CVE-2017-0899)

* It was found that rubygems could use an excessive amount of CPU
while parsing a sufficiently long gem summary. A specially crafted gem
from a gem repository could freeze gem commands attempting to parse
its summary. (CVE-2017-0900)

* A buffer overflow vulnerability was found in the JSON extension of
ruby. An attacker with the ability to pass a specially crafted JSON
input to the extension could use this flaw to expose the interpreter's
heap memory. (CVE-2017-14064)

* The 'lazy_initialize' function in lib/resolv.rb did not properly
process certain filenames. A remote attacker could possibly exploit
this flaw to inject and execute arbitrary commands. (CVE-2017-17790)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2018:0378"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-0898"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-0899"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-0900"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-0901"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-0902"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-0903"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-10784"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-14033"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-14064"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-17405"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2017-17790"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-irb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-tcltk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-bigdecimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-io-console");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-json");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-minitest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-psych");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-rake");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-rdoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygems");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygems-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/08/31");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/02/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/03/01");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.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) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 7.x", "Red Hat " + 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$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2018:0378";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ruby-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ruby-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"ruby-debuginfo-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ruby-devel-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ruby-devel-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"ruby-doc-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"ruby-irb-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"ruby-libs-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"ruby-tcltk-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"ruby-tcltk-2.0.0.648-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"rubygem-bigdecimal-1.2.0-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rubygem-bigdecimal-1.2.0-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"rubygem-io-console-0.4.2-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rubygem-io-console-0.4.2-33.el7_4")) flag++;

  if (rpm_exists(rpm:"rubygem-json-1.7", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"s390x", reference:"rubygem-json-1.7.7-33.el7_4")) flag++;

  if (rpm_exists(rpm:"rubygem-json-1.7", release:"RHEL7") && rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rubygem-json-1.7.7-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"rubygem-minitest-4.3.2-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"rubygem-psych-2.0.0-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"rubygem-psych-2.0.0-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"rubygem-rake-0.9.6-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"rubygem-rdoc-4.0.0-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"rubygems-2.0.14.1-33.el7_4")) flag++;

  if (rpm_check(release:"RHEL7", reference:"rubygems-devel-2.0.14.1-33.el7_4")) flag++;


  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ruby / ruby-debuginfo / ruby-devel / ruby-doc / ruby-irb / etc");
  }
}