Oracle Linux 7 : gnutls (ELSA-2018-3050)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2018:3050 and 
# Oracle Linux Security Advisory ELSA-2018-3050 respectively.
#

include("compat.inc");

if (description)
{
  script_id(118764);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/27");

  script_cve_id("CVE-2018-10844", "CVE-2018-10845", "CVE-2018-10846");
  script_xref(name:"RHSA", value:"2018:3050");

  script_name(english:"Oracle Linux 7 : gnutls (ELSA-2018-3050)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Oracle Linux host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"From Red Hat Security Advisory 2018:3050 :

An update for gnutls 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.

The gnutls packages provide the GNU Transport Layer Security (GnuTLS)
library, which implements cryptographic algorithms and protocols such
as SSL, TLS, and DTLS.

The following packages have been upgraded to a later upstream version:
gnutls (3.3.29). (BZ#1561481)

Security Fix(es) :

* gnutls: HMAC-SHA-256 vulnerable to Lucky thirteen attack due to not
enough dummy function calls (CVE-2018-10844)

* gnutls: HMAC-SHA-384 vulnerable to Lucky thirteen attack due to use
of wrong constant (CVE-2018-10845)

* gnutls: 'Just in Time' PRIME + PROBE cache-based side channel attack
can lead to plaintext recovery (CVE-2018-10846)

For more details about the security issue(s), including the impact, a
CVSS score, 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 7.6 Release Notes linked from the References section."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://oss.oracle.com/pipermail/el-errata/2018-November/008191.html"
  );
  script_set_attribute(
    attribute:"solution",
    value:"Update the affected gnutls packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N");
  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:oracle:linux:gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:gnutls-c++");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:gnutls-dane");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:gnutls-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:gnutls-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/11/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/07");
  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:"Oracle Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleLinux", "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);
if (!get_kb_item("Host/OracleLinux")) audit(AUDIT_OS_NOT, "Oracle Linux");
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, "Oracle Linux");
os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Oracle Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Oracle Linux 7", "Oracle Linux " + 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, "Oracle Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

flag = 0;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"gnutls-3.3.29-8.0.1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"gnutls-c++-3.3.29-8.0.1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"gnutls-dane-3.3.29-8.0.1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"gnutls-devel-3.3.29-8.0.1.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"gnutls-utils-3.3.29-8.0.1.el7")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "gnutls / gnutls-c++ / gnutls-dane / gnutls-devel / gnutls-utils");
}