Debian DSA-4332-1 : ruby2.3 - security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4332. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(118721);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/29");

  script_cve_id("CVE-2018-16395", "CVE-2018-16396");
  script_xref(name:"DSA", value:"4332");

  script_name(english:"Debian DSA-4332-1 : ruby2.3 - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Several vulnerabilities have been discovered in the interpreter for
the Ruby language. The Common Vulnerabilities and Exposures project
identifies the following problems :

  - CVE-2018-16395
    Tyler Eckstein reported that the equality check of
    OpenSSL::X509::Name could return true for non-equal
    objects. If a malicious X.509 certificate is passed to
    compare with an existing certificate, there is a
    possibility to be judged incorrectly that they are
    equal.

  - CVE-2018-16396
    Chris Seaton discovered that tainted flags are not
    propagated in Array#pack and String#unpack with some
    directives."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-16395"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-16396"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/ruby2.3"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/ruby2.3"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2018/dsa-4332"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade the ruby2.3 packages.

For the stable distribution (stretch), these problems have been fixed
in version 2.3.3-1+deb9u4."
  );
  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:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/11/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/11/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/05");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"9.0", prefix:"libruby2.3", reference:"2.3.3-1+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3", reference:"2.3.3-1+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3-dev", reference:"2.3.3-1+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3-doc", reference:"2.3.3-1+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3-tcltk", reference:"2.3.3-1+deb9u4")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");