GLSA-200409-16 : Samba: Denial of Service vulnerabilities

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 200409-16.
#
# 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('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(14710);
  script_version("1.18");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_cve_id("CVE-2004-0807", "CVE-2004-0808");
  script_xref(name:"GLSA", value:"200409-16");

  script_name(english:"GLSA-200409-16 : Samba: Denial of Service vulnerabilities");
  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-200409-16
(Samba: Denial of Service vulnerabilities)

    There is a defect in smbd's ASN.1 parsing. A bad packet received during the
    authentication request could throw newly-spawned smbd processes into an
    infinite loop (CAN-2004-0807). Another defect was found in nmbd's
    processing of mailslot packets, where a bad NetBIOS request could crash the
    nmbd process (CAN-2004-0808).
  
Impact :

    A remote attacker could send specially crafted packets to trigger both
    defects. The ASN.1 parsing issue can be exploited to exhaust all available
    memory on the Samba host, potentially denying all service to that server.
    The nmbd issue can be exploited to crash the nmbd process, resulting in a
    Denial of Service condition on the Samba server.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/200409-16"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All Samba 3.x users should upgrade to the latest version:
    # emerge sync
    # emerge -pv '>=net-fs/samba-3.0.7'
    # emerge '>=net-fs/samba-3.0.7'"
  );
  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:samba");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2004/09/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2004/09/13");
  script_set_attribute(attribute:"vuln_publication_date", value:"2004/09/13");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2004-2021 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-fs/samba", unaffected:make_list("ge 3.0.7", "lt 3.0"), vulnerable:make_list("lt 3.0.7"))) 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, "Samba");
}