Vulnerabilities > CVE-2006-6931 - Denial of Service vulnerability in Snort Backtracking

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 200702-03.
#
# The advisory text is Copyright (C) 2001-2015 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(24352);
  script_version("1.13");
  script_cvs_date("Date: 2019/08/02 13:32:43");

  script_cve_id("CVE-2006-6931");
  script_xref(name:"GLSA", value:"200702-03");

  script_name(english:"GLSA-200702-03 : Snort: Denial of Service");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-200702-03
(Snort: Denial of Service)

    Randy Smith, Christian Estan and Somesh Jha discovered that the rule
    matching algorithm of Snort can be exploited in a way known as a
    'backtracking attack' to perform numerous time-consuming operations.
  
Impact :

    A remote attacker could send specially crafted network packets, which
    would result in the cessation of the detections and the consumption of
    the CPU resources.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/200702-03"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All Snort users should upgrade to the latest version:
    # emerge --sync
    # emerge --ask --oneshot --verbose '>=net-analyzer/snort-2.6.1.2'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:snort");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2007/02/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2007/02/15");
  script_set_attribute(attribute:"vuln_publication_date", value:"2006/12/12");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2007-2019 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"net-analyzer/snort", unaffected:make_list("ge 2.6.1.2"), vulnerable:make_list("lt 2.6.1.2"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "Snort");
}

#%NASL_MIN_LEVEL 80502

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Mandrake Linux Security Advisory MDKSA-2007:051. 
# The text itself is copyright (C) Mandriva S.A.
#

include("compat.inc");

if (description)
{
  script_id(24754);
  script_version ("1.15");
  script_cvs_date("Date: 2019/08/02 13:32:49");

  script_cve_id("CVE-2006-6931");
  script_xref(name:"MDKSA", value:"2007:051");

  script_name(english:"Mandrake Linux Security Advisory : snort (MDKSA-2007:051)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Mandrake Linux host is missing one or more security
updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Algorithmic complexity vulnerability in Snort before 2.6.1, during
predicate evaluation in rule matching for certain rules, allows remote
attackers to cause a denial of service (CPU consumption and detection
outage) via crafted network traffic, aka a backtracking attack.

Updated packages have been patched to address this issue."
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-bloat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-inline");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-inline+flexresp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-mysql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-mysql+flexresp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-plain+flexresp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-postgresql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-postgresql+flexresp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-prelude");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-prelude+flexresp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-snmp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:snort-snmp+flexresp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mandriva:linux:2006");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mandriva:linux:2007");

  script_set_attribute(attribute:"patch_publication_date", value:"2007/02/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2007/03/02");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2007-2019 Tenable Network Security, Inc.");
  script_family(english:"Mandriva Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/Mandrake/release", "Host/Mandrake/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/Mandrake/release")) audit(AUDIT_OS_NOT, "Mandriva / Mandake Linux");
if (!get_kb_item("Host/Mandrake/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^(amd64|i[3-6]86|x86_64)$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Mandriva / Mandrake Linux", cpu);


flag = 0;
if (rpm_check(release:"MDK2006.0", reference:"snort-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-bloat-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-inline-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-inline+flexresp-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-mysql-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-mysql+flexresp-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-plain+flexresp-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-postgresql-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-postgresql+flexresp-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-snmp-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK2006.0", reference:"snort-snmp+flexresp-2.3.3-2.3.20060mdk", yank:"mdk")) flag++;

if (rpm_check(release:"MDK2007.0", reference:"snort-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-bloat-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-inline-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-inline+flexresp-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-mysql-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-mysql+flexresp-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-plain+flexresp-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-postgresql-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-postgresql+flexresp-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-prelude-2.6.0-3.1mdv2007.0", yank:"mdv")) flag++;
if (rpm_check(release:"MDK2007.0", reference:"snort-prelude+flexresp-2.6.0-3.1mdv2007.0", yank:"mdv")) 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");