5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
7.7 High
AI Score
Confidence
High
0.963 High
EPSS
Percentile
99.5%
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted from the extension negotiation message. A client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP) implemented by these extensions mishandles the handshake phase and mishandles use of sequence numbers.
This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(502223);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/22");
script_cve_id("CVE-2023-48795");
script_name(english:"Siemens SIMATIC S7-1500 Truncation of Security-relevant Information (CVE-2023-48795)");
script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
script_set_attribute(attribute:"description", value:
"The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6
and other products, allows remote attackers to bypass integrity checks such that some
packets are omitted from the extension negotiation message. A client and server may
consequently end up with a connection for which some security features have been
downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary
Packet Protocol (BPP) implemented by these extensions mishandles the handshake
phase and mishandles use of sequence numbers.
This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-24-102-04");
script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-794697.html");
script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-398330.html");
script_set_attribute(attribute:"solution", value:
"Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:
- Only build and run applications from trusted sources
Product-specific remediations or mitigations can be found in the section 'Affected Products and Solution' of
the vendor advisory.
For more information, see the associated Siemens security advisory in HTML and CSAF.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:N/I:C/A:N");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-48795");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2024/04/09");
script_set_attribute(attribute:"patch_publication_date", value:"2024/04/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/04/22");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_tm_mfp");
script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1518-4_pn%2fdp_mfp_firmware");
script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_1518f-4_pn%2fdp_mfp_firmware");
script_set_attribute(attribute:"generated_plugin", value:"former");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Tenable.ot");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("tenable_ot_api_integration.nasl");
script_require_keys("Tenable.ot/Siemens");
exit(0);
}
include('tenable_ot_cve_funcs.inc');
get_kb_item_or_exit('Tenable.ot/Siemens');
var asset = tenable_ot::assets::get(vendor:'Siemens');
var vuln_cpes = {
"cpe:/o:siemens:simatic_s7-1500_tm_mfp" :
{"versionStartIncluding" : "1.1", "versionEndIncluding" : "1.1", "family" : "S71500", "orderNumbers": ["6ES7558-1AA00-0AB0"]},
"cpe:/o:siemens:cpe:/o:siemens:simatic_s7-1500_cpu_1518-4_pn%2fdp_mfp_firmware" :
{"versionStartIncluding" : "3.1", "versionEndIncluding" : "3.1", "family" : "S71500", "orderNumbers" : ["6ES7518-4AX00-1AB0","6ES7518-4AX00-1AC0","6AG1518-4AX00-4AC0"]},
"cpe:/o:siemens:cpe:/o:siemens:simatic_s7-1500_cpu_1518f-4_pn%2fdp_mfp_firmware" :
{"versionStartIncluding" : "3.1", "versionEndIncluding" : "3.1", "family" : "S71500", "orderNumbers" : ["6ES7518-4FX00-1AB0","6ES7518-4FX00-1AC0"]}
};
tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);
Vendor | Product | Version | CPE |
---|---|---|---|
siemens | simatic_s7-1500_tm_mfp | cpe:/o:siemens:simatic_s7-1500_tm_mfp | |
siemens | simatic_s7-1500_cpu_1518-4_pn%2fdp_mfp_firmware | cpe:/o:siemens:simatic_s7-1500_cpu_1518-4_pn%2fdp_mfp_firmware | |
siemens | simatic_s7-1500_cpu_1518f-4_pn%2fdp_mfp_firmware | cpe:/o:siemens:simatic_s7-1500_cpu_1518f-4_pn%2fdp_mfp_firmware |
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
7.7 High
AI Score
Confidence
High
0.963 High
EPSS
Percentile
99.5%