CentOS 6 / 7 : openssl (CESA-2015:1072) (Logjam)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2015:1072 and 
# CentOS Errata and Security Advisory 2015:1072 respectively.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(83994);
  script_version("2.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/05");

  script_cve_id("CVE-2015-4000");
  script_bugtraq_id(74733);
  script_xref(name:"RHSA", value:"2015:1072");
  script_xref(name:"CEA-ID", value:"CEA-2021-0004");

  script_name(english:"CentOS 6 / 7 : openssl (CESA-2015:1072) (Logjam)");

  script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"Updated openssl packages that fix one security issue are now available
for Red Hat Enterprise Linux 6 and 7.

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

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL
v2/v3) and Transport Layer Security (TLS v1) protocols, as well as a
full-strength, general purpose cryptography library.

A flaw was found in the way the TLS protocol composes the
Diffie-Hellman (DH) key exchange. A man-in-the-middle attacker could
use this flaw to force the use of weak 512 bit export-grade keys
during the key exchange, allowing them do decrypt all traffic.
(CVE-2015-4000)

Note: This update forces the TLS/SSL client implementation in OpenSSL
to reject DH key sizes below 768 bits, which prevents sessions to be
downgraded to export-grade keys. Future updates may raise this limit
to 1024 bits.

All openssl users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. For the update
to take effect, all services linked to the OpenSSL library must be
restarted, or the system rebooted.");
  # https://lists.centos.org/pipermail/centos-announce/2015-June/021157.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e68ebb6e");
  # https://lists.centos.org/pipermail/centos-announce/2015-June/021159.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9861eafd");
  script_set_attribute(attribute:"solution", value:
"Update the affected openssl packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/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:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-4000");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"in_the_news", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/05/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/06/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/06/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssl-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssl-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssl-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssl-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");
  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) 2015-2022 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:"^(6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x / 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-6", reference:"openssl-1.0.1e-30.el6.9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"openssl-devel-1.0.1e-30.el6.9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"openssl-perl-1.0.1e-30.el6.9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"openssl-static-1.0.1e-30.el6.9")) flag++;

if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssl-1.0.1e-42.el7.6")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssl-devel-1.0.1e-42.el7.6")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssl-libs-1.0.1e-42.el7.6")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssl-perl-1.0.1e-42.el7.6")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssl-static-1.0.1e-42.el7.6")) 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, "openssl / openssl-devel / openssl-libs / openssl-perl / etc");
}