CentOS 6 : httpd (CESA-2017:2972) (Optionsbleed)

#%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-2017:2972 and 
# CentOS Errata and Security Advisory 2017:2972 respectively.
#

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

if (description)
{
  script_id(104053);
  script_version("3.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2017-12171", "CVE-2017-9798");
  script_xref(name:"RHSA", value:"2017:2972");

  script_name(english:"CentOS 6 : httpd (CESA-2017:2972) (Optionsbleed)");
  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:
"An update for httpd is now available for Red Hat Enterprise Linux 6.

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 httpd packages provide the Apache HTTP Server, a powerful,
efficient, and extensible web server.

Security Fix(es) :

* A use-after-free flaw was found in the way httpd handled invalid and
previously unregistered HTTP methods specified in the Limit directive
used in an .htaccess file. A remote attacker could possibly use this
flaw to disclose portions of the server memory, or cause httpd child
process to crash. (CVE-2017-9798)

* A regression was found in the Red Hat Enterprise Linux 6.9 version
of httpd, causing comments in the 'Allow' and 'Deny' configuration
lines to be parsed incorrectly. A web administrator could
unintentionally allow any client to access a restricted HTTP resource.
(CVE-2017-12171)

Red Hat would like to thank Hanno Bock for reporting CVE-2017-9798
and KAWAHARA Masashi for reporting CVE-2017-12171."
  );
  # https://lists.centos.org/pipermail/centos-announce/2017-October/022601.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?606f1793"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected httpd packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-12171");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:httpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:httpd-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:httpd-manual");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:httpd-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:mod_ssl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/09/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/10/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/23");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2021 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:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.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:"httpd-2.2.15-60.el6.centos.6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"httpd-devel-2.2.15-60.el6.centos.6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"httpd-manual-2.2.15-60.el6.centos.6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"httpd-tools-2.2.15-60.el6.centos.6")) flag++;
if (rpm_check(release:"CentOS-6", reference:"mod_ssl-2.2.15-60.el6.centos.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, "httpd / httpd-devel / httpd-manual / httpd-tools / mod_ssl");
}