Siemens SIMATIC and SCALANCE Devices Exposure of Sensitive Information to an Unauthorized Actor (CVE-2024-5535)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(502880);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/13");

  script_cve_id("CVE-2024-5535");
  script_xref(name:"ICSA", value:"25-044-09");

  script_name(english:"Siemens SIMATIC and SCALANCE Devices Exposure of Sensitive Information to an Unauthorized Actor (CVE-2024-5535)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Calling the OpenSSL API function SSL_select_next_proto with an empty
supported client protocols buffer may cause a crash or memory contents
to be sent to the peer. A buffer overread can have a range of
potential consequences such as unexpected application beahviour or a
crash. In particular this issue could result in up to 255 bytes of
arbitrary private data from memory being sent to the peer leading to a
loss of confidentiality. However, only applications that directly call
the SSL_select_next_proto function with a 0 length list of supported
client protocols are affected by this issue. This would normally never
be a valid scenario and is typically not under attacker control but
may occur by accident in the case of a configuration or programming
error in the calling application. The OpenSSL API function
SSL_select_next_proto is typically used by TLS applications that
support ALPN (Application Layer Protocol Negotiation) or NPN (Next
Protocol Negotiation). NPN is older, was never standardised and is
deprecated in favour of ALPN. We believe that ALPN is significantly
more widely deployed than NPN. The SSL_select_next_proto function
accepts a list of protocols from the server and a list of protocols
from the client and returns the first protocol that appears in the
server list that also appears in the client list. In the case of no
overlap between the two lists it returns the first item in the client
list. In either case it will signal whether an overlap between the two
lists was found. In the case where SSL_select_next_proto is called
with a zero length client list it fails to notice this condition and
returns the memory immediately following the client list pointer (and
reports that there was no overlap in the lists). This function is
typically called from a server side application callback for ALPN or a
client side application callback for NPN. In the case of ALPN the list
of protocols supplied by the client is guaranteed by libssl to never
be zero in length. The list of server protocols comes from the
application and should never normally be expected to be of zero
length. In this case if the SSL_select_next_proto function has been
called as expected (with the list supplied by the client passed in the
client/client_len parameters), then the application will not be
vulnerable to this issue. If the application has accidentally been
configured with a zero length server list, and has accidentally passed
that zero length server list in the client/client_len parameters, and
has additionally failed to correctly handle a no overlap response
(which would normally result in a handshake failure in ALPN) then it
will be vulnerable to this problem. In the case of NPN, the protocol
permits the client to opportunistically select a protocol when there
is no overlap. OpenSSL returns the first client protocol in the no
overlap case in support of this. The list of client protocols comes
from the application and should never normally be expected to be of
zero length. However if the SSL_select_next_proto function is
accidentally called with a client_len of 0 then an invalid memory
pointer will be returned instead. If the application uses this output
as the opportunistic protocol then the loss of confidentiality will
occur. This issue has been assessed as Low severity because
applications are most likely to be vulnerable if they are using NPN
instead of ALPN - but NPN is not widely used. It also requires an
application configuration or programming error. Finally, this issue
would not typically be under attacker control making active
exploitation unlikely. The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are
not affected by this issue. Due to the low severity of this issue we
are not issuing new releases of OpenSSL at this time. The fix will be
included in the next releases when they become available.

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://cert-portal.siemens.com/productcert/html/ssa-398330.html");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-265688.html");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-915275.html");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-769027.html");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109975745/");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109977720/");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-25-044-09");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-5535");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(200);

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/12/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/02/24");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wab762-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wub762-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wub762-1_ifeatures_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum763-1_%28us%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum763-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_%28me%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_%28usa%29_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_cpu_firmware:3.1.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_s7-1500_cpu_firmware:3.1.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-1500_tm_mfp");
  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) 2025 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_cpu_firmware:3.1.5" :
        {"versionEndExcluding" : "3.1.5", "versionStartIncluding" : "3.1.0", "family" : "S71500", "orderNumbers" : ['6ES7518-4FX00-1AB0', '6ES7518-4AX00-1AB0', '6ES7518-4FX00-1AC0', '6ES7518-4AX00-1AC0']},
    "cpe:/o:siemens:siplus_s7-1500_cpu_firmware:3.1.5" :
        {"versionEndExcluding" : "3.1.5", "versionStartIncluding" : "3.1.0", "family" : "S71500", "orderNumbers" : ['6AG1518-4AX00-4AC0']},
    "cpe:/o:siemens:simatic_s7-1500_tm_mfp" :
        {"family" : "S71500", "orderNumbers": ["6ES7558-1AA00-0AB0"]},
    "cpe:/o:siemens:scalance_wab762-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5762-1AJ00-6AA0']},
    "cpe:/o:siemens:scalance_wam763-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DA0']},
    "cpe:/o:siemens:scalance_wam763-1_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DC0']},
    "cpe:/o:siemens:scalance_wam763-1_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DB0']},
    "cpe:/o:siemens:scalance_wam766-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DA0']},
    "cpe:/o:siemens:scalance_wam766-1_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DC0']},
    "cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DB0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TA0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TC0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TB0']},
    "cpe:/o:siemens:scalance_wub762-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5762-1AJ00-1AA0']},
    "cpe:/o:siemens:scalance_wub762-1_ifeatures_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5762-1AJ00-2AA0']},
    "cpe:/o:siemens:scalance_wum763-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-3AA0', '6GK5763-1AL00-3DA0']},
    "cpe:/o:siemens:scalance_wum763-1_%28us%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-3DB0', '6GK5763-1AL00-3AB0']},
    "cpe:/o:siemens:scalance_wum766-1_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DA0']},
    "cpe:/o:siemens:scalance_wum766-1_%28me%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DC0']},
    "cpe:/o:siemens:scalance_wum766-1_%28usa%29_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DB0']}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_HOLE);