OpenSSH < 4.2 Multiple Vulnerabilities

#
# (C) Tenable, Inc.
#

include("compat.inc");

if (description)
{
  script_id(19592);
  script_version("1.21");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/27");

  script_cve_id("CVE-2005-2797", "CVE-2005-2798", "CVE-2006-0393");
  script_bugtraq_id(14727, 14729, 19289);

  script_name(english:"OpenSSH < 4.2 Multiple Vulnerabilities");
  script_summary(english:"Checks for GSSAPI credential disclosure vulnerability in OpenSSH");
 
  script_set_attribute(attribute:"synopsis", value:
"The remote SSH server has multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the version of OpenSSH installed on the
remote host has the following vulnerabilities :

  - X11 forwarding may be enabled unintentionally when
    multiple forwarding requests are made on the same session,
    or when an X11 listener is orphaned after a session goes
    away. (CVE-2005-2797)

  - GSSAPI credentials may be delegated to users who
    log in using something other than GSSAPI authentication
    if 'GSSAPIDelegateCredentials' is enabled. (CVE-2005-2798)

  - Attempting to log in as a nonexistent user causes
    the authentication process to hang, which could
    be exploited to enumerate valid user accounts.
    Only OpenSSH on Mac OS X 10.4.x is affected.
    (CVE-2006-0393)

  - Repeatedly attempting to log in as a nonexistent
    user could result in a denial of service.
    Only OpenSSH on Mac OS X 10.4.x is affected.
    (CVE-2006-0393)");
  script_set_attribute(attribute:"see_also", value:"http://www.openssh.com/txt/release-4.2");
  script_set_attribute(attribute:"see_also", value:"https://lists.apple.com/archives/security-announce/2006/Aug/msg00000.html");
  script_set_attribute(attribute:"see_also",value:"https://support.apple.com/?artnum=304063");
  script_set_attribute(attribute:"solution", value:
"Upgrade to OpenSSH 4.2 or later.  For OpenSSH on Mac OS X 10.4.x,
apply Mac OS X Security Update 2006-004." );
 script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:N/A:N");
 script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"plugin_publication_date", value: "2005/09/07");
  script_set_attribute(attribute:"vuln_publication_date", value: "2005/09/01");
  script_set_attribute(attribute:"patch_publication_date", value: "2005/09/01");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:openbsd:openssh");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");
  script_copyright(english:"This script is Copyright (C) 2005-2024 Tenable, Inc.");
  script_dependencies("openssh_detect.nbin");
  script_require_keys("installed_sw/OpenSSH");
  script_require_ports("Services/ssh", 22);

  exit(0);
}

include('backport.inc');
include('vcf.inc');
include('vcf_extras.inc');

var port = get_service(svc:'ssh', default:22, exit_on_fail:TRUE);
var app_info = vcf::openssh::get_app_info(app:'OpenSSH', port:port);

vcf::check_all_backporting(app_info:app_info);

var constraints = [
  {'fixed_version': '4.2'}
];

vcf::openssh::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_NOTE);