CentOS 6 / 7 : nss (CESA-2016:0007) (SLOTH)

2016-01-08T00:00:00
ID CENTOS_RHSA-2016-0007.NASL
Type nessus
Reporter Tenable
Modified 2018-07-02T00:00:00

Description

Updated nss 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.

Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications.

A flaw was found in the way TLS 1.2 could use the MD5 hash function for signing ServerKeyExchange and Client Authentication packets during a TLS handshake. A man-in-the-middle attacker able to force a TLS connection to use the MD5 hash function could use this flaw to conduct collision attacks to impersonate a TLS server or an authenticated TLS client. (CVE-2015-7575)

All nss 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 NSS library must be restarted, or the system rebooted.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2016:0007 and 
# CentOS Errata and Security Advisory 2016:0007 respectively.
#

include("compat.inc");

if (description)
{
  script_id(87780);
  script_version("2.10");
  script_cvs_date("Date: 2018/07/02 18:48:54");

  script_cve_id("CVE-2015-7575");
  script_xref(name:"RHSA", value:"2016:0007");

  script_name(english:"CentOS 6 / 7 : nss (CESA-2016:0007) (SLOTH)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated nss 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.

Network Security Services (NSS) is a set of libraries designed to
support the cross-platform development of security-enabled client and
server applications.

A flaw was found in the way TLS 1.2 could use the MD5 hash function
for signing ServerKeyExchange and Client Authentication packets during
a TLS handshake. A man-in-the-middle attacker able to force a TLS
connection to use the MD5 hash function could use this flaw to conduct
collision attacks to impersonate a TLS server or an authenticated TLS
client. (CVE-2015-7575)

All nss 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 NSS library must be restarted,
or the system rebooted."
  );
  # http://lists.centos.org/pipermail/centos-announce/2016-January/021594.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?be563df5"
  );
  # http://lists.centos.org/pipermail/centos-announce/2016-January/021602.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?8561830b"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected nss 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: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:centos:centos:nss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:nss-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:nss-pkcs11-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:nss-sysinit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:nss-tools");
  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:"patch_publication_date", value:"2016/01/07");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/08");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  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);
if (!get_kb_item("Host/CentOS/release")) audit(AUDIT_OS_NOT, "CentOS");
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:"nss-3.19.1-8.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"nss-devel-3.19.1-8.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"nss-pkcs11-devel-3.19.1-8.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"nss-sysinit-3.19.1-8.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"nss-tools-3.19.1-8.el6_7")) flag++;

if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"nss-3.19.1-19.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"nss-devel-3.19.1-19.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"nss-pkcs11-devel-3.19.1-19.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"nss-sysinit-3.19.1-19.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"nss-tools-3.19.1-19.el7_2")) flag++;


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