CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
AI Score
Confidence
Low
EPSS
Percentile
82.5%
According to its banner, the version of OpenSSH running on the remote host is prior to 6.9. It is, therefore, affected by the following vulnerabilities :
A flaw exists within the x11_open_helper() function in the ‘channels.c’ file that allows connections to be permitted after ‘ForwardX11Timeout’ has expired. A remote attacker can exploit this to bypass timeout checks and XSECURITY restrictions. (CVE-2015-5352)
Various issues were addressed by fixing the weakness in agent locking by increasing the failure delay, storing the salted hash of the password, and using a timing-safe comparison function.
An out-of-bounds read error exists when handling incorrect pattern lengths. A remote attacker can exploit this to cause a denial of service or disclose sensitive information in the memory.
An out-of-bounds read error exists when parsing the ‘EscapeChar’ configuration option.
#
# (C) Tenable, Inc.
#
include("compat.inc");
if (description)
{
script_id(84638);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/27");
script_cve_id("CVE-2015-5352");
script_bugtraq_id(75525);
script_name(english:"OpenSSH < 6.9 Multiple Vulnerabilities");
script_summary(english:"Checks the OpenSSH banner version.");
script_set_attribute(attribute:"synopsis", value:
"The SSH server running on the remote host is affected by multiple
vulnerabilities.");
script_set_attribute(attribute:"description", value:
"According to its banner, the version of OpenSSH running on the remote
host is prior to 6.9. It is, therefore, affected by the following
vulnerabilities :
- A flaw exists within the x11_open_helper() function in
the 'channels.c' file that allows connections to be
permitted after 'ForwardX11Timeout' has expired. A
remote attacker can exploit this to bypass timeout
checks and XSECURITY restrictions. (CVE-2015-5352)
- Various issues were addressed by fixing the weakness in
agent locking by increasing the failure delay, storing
the salted hash of the password, and using a timing-safe
comparison function.
- An out-of-bounds read error exists when handling
incorrect pattern lengths. A remote attacker can exploit
this to cause a denial of service or disclose sensitive
information in the memory.
- An out-of-bounds read error exists when parsing the
'EscapeChar' configuration option.");
script_set_attribute(attribute:"see_also", value:"http://www.openssh.com/txt/release-6.9");
# https://anongit.mindrot.org/openssh.git/commit/?id=77199d6ec8986d470487e66f8ea8f4cf43d2e20c
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?725c4682");
script_set_attribute(attribute:"solution", value:"Upgrade to OpenSSH 6.9 or later.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"manual");
script_set_attribute(attribute:"cvss_score_rationale", value:"score from a more in depth analysis done by Tenable");
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:"2015/07/01");
script_set_attribute(attribute:"patch_publication_date", value:"2015/06/30");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/07/09");
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 = [
{'fixed_version': '6.9'}
];
vcf::openssh::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);