GLSA-201601-01 : OpenSSH: Multiple 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 201601-01.
#
# The advisory text is Copyright (C) 2001-2016 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(87985);
  script_version("2.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2016-0777", "CVE-2016-0778");
  script_xref(name:"GLSA", value:"201601-01");

  script_name(english:"GLSA-201601-01 : OpenSSH: Multiple 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-201601-01
(OpenSSH: Multiple vulnerabilities)

    Qualys have reported two issues in the “roaming” code included in
      the OpenSSH client, which provides undocumented, experimental support for
      resuming SSH connections. An OpenSSH client could be tricked into leaking
      parts of its memory to a malicious server. Furthermore, a buffer overflow
      can be exploited by a malicious server, but its exploitation requires
      non-default options and is mitigated due to another bug.
  
Impact :

    A remote attacker could entice a user to connect to a specially crafted
      OpenSSH server, possibly resulting in the disclosure of the user’s
      private keys. Users with private keys that are not protected by a
      passphrase are advised to generate new keys if they have connected to an
      SSH server they don’t fully trust.
    Note that no special configuration is required to be vulnerable as the
      roaming feature is enabled by default on the client.
  
Workaround :

    The issues can be worked around by disabling the roaming code. To do so,
      add “UseRoaming no” to the SSH client configuration, or specify “-o
      ‘UseRoaming no’” on the command line."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201601-01"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All OpenSSH users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=net-misc/openssh-7.1_p2'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:S/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");

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

  script_set_attribute(attribute:"patch_publication_date", value:"2016/01/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/19");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2021 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-misc/openssh", unaffected:make_list("ge 7.1_p2"), vulnerable:make_list("lt 7.1_p2"))) 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, "OpenSSH");
}