CentOS 7 : glibc (CESA-2014:2023)

#%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-2014:2023 and 
# CentOS Errata and Security Advisory 2014:2023 respectively.
#

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

if (description)
{
  script_id(80123);
  script_version("1.13");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2014-7817");
  script_bugtraq_id(71216);
  script_xref(name:"RHSA", value:"2014:2023");

  script_name(english:"CentOS 7 : glibc (CESA-2014:2023)");
  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 glibc packages that fix one security issue and one bug are now
available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

The glibc packages provide the standard C libraries (libc), POSIX
thread libraries (libpthread), standard math libraries (libm), and the
Name Server Caching Daemon (nscd) used by multiple programs on the
system. Without these libraries, the Linux system cannot function
correctly.

It was found that the wordexp() function would perform command
substitution even when the WRDE_NOCMD flag was specified. An attacker
able to provide specially crafted input to an application using the
wordexp() function, and not sanitizing the input correctly, could
potentially use this flaw to execute arbitrary commands with the
credentials of the user running that application. (CVE-2014-7817)

This issue was discovered by Tim Waugh of the Red Hat Developer
Experience Team.

This update also fixes the following bug :

* Prior to this update, if a file stream that was opened in append
mode and its underlying file descriptor were used at the same time and
the file was truncated using the ftruncate() function on the file
descriptor, a subsequent ftell() call on the stream incorrectly
modified the file offset by seeking to the new end of the file. This
update ensures that ftell() modifies the state of the file stream only
when it is in append mode and its buffer is not empty. As a result,
the described incorrect changes to the file offset no longer occur.
(BZ#1170187)

All glibc users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues."
  );
  # https://lists.centos.org/pipermail/centos-announce/2014-December/020849.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f97aa0b8"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected glibc packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-7817");
  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:glibc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-headers");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:glibc-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:nscd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2014/11/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2014/12/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/12/22");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2014-2021 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);
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:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 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-7", cpu:"x86_64", reference:"glibc-2.17-55.el7_0.3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-common-2.17-55.el7_0.3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-devel-2.17-55.el7_0.3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-headers-2.17-55.el7_0.3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-static-2.17-55.el7_0.3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"glibc-utils-2.17-55.el7_0.3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"nscd-2.17-55.el7_0.3")) 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, "glibc / glibc-common / glibc-devel / glibc-headers / glibc-static / etc");
}