OpenSSH < 2.9.9p1 Resource Limit Bypass

#
# (C) Tenable, Inc.
#

include('compat.inc');

if (description)
{
  script_id(44069);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/27");

  script_cve_id("CVE-2001-1459");
  script_bugtraq_id(2917);
  script_xref(name:"CERT", value:"797027");

  script_name(english:"OpenSSH < 2.9.9p1 Resource Limit Bypass");
  script_summary(english:"Checks for remote SSH version");

  script_set_attribute(attribute:"synopsis", value:
"The remote SSH service is affected by a denial of service
vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the remote host is running a version of
OpenSSH earlier than 2.9.9/2.9.9p1.  Such versions fail to initiate a
Pluggable Authentication Module (PAM) session if commands are executed
with no pty.  A remote, unauthenticated attacker, exploiting this
flaw, could bypass resource limits (rlimits) set in pam.d.");
  script_set_attribute(attribute:"see_also", value:"https://marc.info/?l=bugtraq&m=99324968918628&w=2");
  script_set_attribute(attribute:"solution", value:"Upgrade to OpenSSH 2.9.9/2.9.9p1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2001-1459");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2001/06/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/10/04");
  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_copyright(english:"This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Misc.");

  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': '2.9.9p1', 'fixed_display': '2.9.9p1 / 2.9.9'}
];

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