CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
AI Score
Confidence
High
EPSS
Percentile
78.5%
According to its banner, the version of OpenSSH running on the remote host is 6.1 through 6.6.
It is, therefore, affected by a host verification bypass vulnerability related to SSHFP and certificates that could allow a malicious SSH server to cause the supplied client to inappropriately trust the server.
#
# (C) Tenable, Inc.
#
include("compat.inc");
if (description)
{
script_id(78655);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/27");
script_cve_id("CVE-2014-2653");
script_bugtraq_id(66459);
script_name(english:"OpenSSH SSHFP Record Verification Weakness");
script_summary(english:"Checks the version reported in the SSH banner.");
script_set_attribute(attribute:"synopsis", value:
"A secure shell client on the remote host could be used to bypass host
verification methods.");
script_set_attribute(attribute:"description", value:
"According to its banner, the version of OpenSSH running on the remote
host is 6.1 through 6.6.
It is, therefore, affected by a host verification bypass vulnerability
related to SSHFP and certificates that could allow a malicious SSH
server to cause the supplied client to inappropriately trust the
server.");
# Vendor patch and note
script_set_attribute(attribute:"see_also", value:"http://thread.gmane.org/gmane.network.openssh.devel/20679");
# SSHFP RFC "Using DNS to Securely Publish Secure Shell (SSH) Key Fingerprints"
script_set_attribute(attribute:"see_also", value:"https://tools.ietf.org/html/rfc4255");
# CVE assignment
script_set_attribute(attribute:"see_also", value:"https://seclists.org/oss-sec/2014/q1/663");
script_set_attribute(attribute:"solution", value:"Update to OpenSSH version 6.7 or later or apply the vendor patch.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-2653");
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:"2014/03/24");
script_set_attribute(attribute:"patch_publication_date", value:"2014/10/21");
script_set_attribute(attribute:"plugin_publication_date", value:"2014/10/23");
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) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
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 = [
{'min_version': '6.1', 'fixed_version': '6.7'}
];
vcf::openssh::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);