GLSA-200408-04 : PuTTY: Pre-authentication arbitrary code execution

#%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 200408-04.
#
# The advisory text is Copyright (C) 2001-2018 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(14560);
  script_version("1.18");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_cve_id("CVE-2004-1440");
  script_xref(name:"GLSA", value:"200408-04");

  script_name(english:"GLSA-200408-04 : PuTTY: Pre-authentication arbitrary code execution");
  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-200408-04
(PuTTY: Pre-authentication arbitrary code execution)

    PuTTY contains a vulnerability allowing a malicious server to execute
    arbitrary code on the connecting client before host key verification.
  
Impact :

    When connecting to a server using the SSH2 protocol an attacker is able
    to execute arbitrary code with the permissions of the user running
    PuTTY by sending specially crafted packets to the client during the
    authentication process but before host key verification.
  
Workaround :

    There is no known workaround at this time. All users are encouraged to
    upgrade to the latest available version of PuTTY."
  );
  # http://www.coresecurity.com/common/showdoc.php?idx=417&idxseccion=10
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.secureauth.com/?idx=417&idxseccion=10"
  );
  # http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/200408-04"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All PuTTY users should upgrade to the latest version:
    # emerge sync
    # emerge -pv '>=net-misc/putty-0.55'
    # emerge '>=net-misc/putty-0.55'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");

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

  script_set_attribute(attribute:"patch_publication_date", value:"2004/08/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2004/08/30");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2004-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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-misc/putty", unaffected:make_list("ge 0.55"), vulnerable:make_list("le 0.54"))) flag++;

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