7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.2 High
AI Score
Confidence
High
0.035 Low
EPSS
Percentile
91.6%
The remote host has a version of PuTTY installed that is prior to 0.71. It is, therefore, affected by multiple vulnerabilities including:
A remotely triggerable buffer overflow in any kind of server-to-client forwarding. (CVE-2019-9895)
Potential recycling of random numbers used in cryptography.
(CVE-2019-9898)
A remotely triggerable memory overwrite in RSA key exchange can occur before host key verification. (CVE-2019-9894)
#
# (C) Tenable Network Security, Inc.
#
include('compat.inc');
if (description)
{
script_id(123418);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/07");
script_cve_id(
"CVE-2019-9894",
"CVE-2019-9895",
"CVE-2019-9896",
"CVE-2019-9897",
"CVE-2019-9898"
);
script_bugtraq_id(107484, 107523);
script_name(english:"PuTTY < 0.71 Multiple Vulnerabilities");
script_set_attribute(attribute:"synopsis", value:
"The remote Windows host has an SSH client that is affected by
multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The remote host has a version of PuTTY installed that is prior to
0.71. It is, therefore, affected by multiple vulnerabilities
including:
- A remotely triggerable buffer overflow in any kind of
server-to-client forwarding. (CVE-2019-9895)
- Potential recycling of random numbers used in cryptography.
(CVE-2019-9898)
- A remotely triggerable memory overwrite in RSA key exchange can
occur before host key verification. (CVE-2019-9894)");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-auth-prompt-spoofing.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fc188a9c");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-chm-hijack.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cd82820f");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-fd-set-overflow.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e116cf63");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-rng-reuse.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?39988fba");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-rsa-kex-integer-overflow.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?50d03d73");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-terminal-dos-combining-chars.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?dc4b5e69");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-terminal-dos-combining-chars-double-width-gtk.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d52aebfd");
# https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-terminal-dos-one-column-cjk.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?819250a8");
script_set_attribute(attribute:"see_also", value:"http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html");
script_set_attribute(attribute:"solution", value:
"Upgrade to PuTTY version 0.71 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_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-9898");
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:"2019/03/16");
script_set_attribute(attribute:"patch_publication_date", value:"2019/03/16");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/27");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:simon_tatham:putty");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Windows");
script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("putty_installed.nasl");
script_require_keys("installed_sw/PuTTY", "SMB/Registry/Enumerated");
exit(0);
}
include("vcf.inc");
get_kb_item_or_exit("SMB/Registry/Enumerated");
app_info = vcf::get_app_info(app:"PuTTY", win_local:TRUE);
constraints = [
{ "fixed_version" : "0.71" }
];
vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);
Vendor | Product | Version | CPE |
---|---|---|---|
simon_tatham | putty | cpe:/a:simon_tatham:putty |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9894
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9895
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9896
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9897
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9898
www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
www.nessus.org/u?39988fba
www.nessus.org/u?50d03d73
www.nessus.org/u?819250a8
www.nessus.org/u?cd82820f
www.nessus.org/u?d52aebfd
www.nessus.org/u?dc4b5e69
www.nessus.org/u?e116cf63
www.nessus.org/u?fc188a9c
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.2 High
AI Score
Confidence
High
0.035 Low
EPSS
Percentile
91.6%