UNCONSTRAINED ENDPOINT SECURITY SYSTEM: UEPTSS

International Journal of Network Security & Its Applications (IJNSA) Vol. 10, No.2, March 2018
DOI: 10.5121/ijnsa.2018.10201 1
UNCONSTRAINED ENDPOINT SECURITY SYSTEM:
UEPTSS
Fatema Bannat Wala1,2
and Chase Cotton1
1
Department of Electrical & Computer Engineering, University of Delaware, Newark
2
University of Delaware, Newark, USA
ABSTRACT
Modern information security management best practices dictate that an enterprise assumes full
configuration control of end user computer systems (laptops, deskside computers, etc.). The benefit of this
explicit control yields lower support costs since there are less variation of machines, operating systems,
and applications to provide support on, but more importantly today, dictating specifically what software,
hardware, and security configurations exist on an end user's machine can help reduce the occurrence of
infection by malicious software significantly. If the data pertaining to end user systems is organized and
catalogued as part of normal information security logging activities, an extended picture of what the end
system actually is may be available to the investigator at a moment's notice to enhance incident response
and mitigation. The purpose of this research is to provide a way of cataloguing this data by using and
augmenting existing tools and open source software deployed in an enterprise network.
KEYWORDS
Endpoint security, device fingerprinting, scanning, inventory, BRO IDS, exploit.
1. INTRODUCTION
Some organizations cannot control some or all of their end user computer systems. Example
organizations include universities, shared offices and start-up spaces, sites offering public
Internet access (e.g. restaurants), and conferences. It is still assumed the enterprise is still
responsible for the protection of infrastructure (servers, routers, switches, security devices, etc.)
as well as end user computers used by staff performing critical business functions (e.g. human
resources, financial records, personal information, etc.).
As such, the enterprise will be running modern external perimeter and internal protections
strategies. Part of this security infrastructure will include the collection, logging, and analysis of
sensor data inside and on the perimeter of the enterprise network.
Parts of this data will contain important information about end user systems in the enterprise
including the systems not managed by the central organization. We call these unmanaged end
user systems "unconstrained" systems. Part of the job of incident response in this enterprise will
be to detect, triage, and investigate anomalous security events seen in the enterprise. In many
cases these events will likely involve unconstrained systems.
The Unconstrained Endpoint Security System (UEPtSS) is a software system to fingerprint
‘Unconstrained’ end user computer systems/devices connected to the enterprise network, and is
especially useful for the organizations with a bring your own device (BYOD) policy [1]. The
reason it is important to fingerprint as much data as possible for an unmanaged device is it gives a
complete picture to an organization of what kinds of devices are being used on the enterprise
network and what services are running on those devices. Having this information pertaining to the
devices also helps in malware incident response, as one of the most vulnerable security controls
in an enterprise network which supports a BYOD policy, is the potentially untrusted software

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running on the end user’s device, as the enterprise has the least control on patching and keeping
that software up to date so as to mitigate the risk of exploitation of latent vulnerabilities. A
successful exploitation on one of these devices can help the attacker to pivot into the network and
to use a chain of exploits against the crucial enterprise controlled and managed systems, as it is
usually for the enterprise to ‘trust’ internal network and devices connecting to their network, often
with additional firewall leniency provided to those systems as well. Hence, a vulnerable endpoint
could potentially be low hanging fruit for the attacker to get a foothold inside the enterprise
network and to pivot into the network to target next to the crown jewels of an enterprise. Hence,
it’s critical to keep track of all devices that connect to the enterprise network.
There are two commonly known solutions available to fingerprint these unconstrained endpoints
that join the network:
Active Scanning: As the name suggest, the active scanning technique is the method to scan the
devices currently connected on a network segment by actively sending different packets to the IPs
in the given range and then analysing the responses to make a best guess of what the endpoint
device could be and what kind of services it could potentially be running. This method is very
common in especially determining the operating systems on various devices connected to the
network. There are numerous open source tools such as Nmap[2], Nessus[3], etc. that provide the
feature of active scanning of subset of the network segments.
● Pros: Active scanning can be accurate when using custom scripts to determine the software
or service running on a device, but these capabilities might only be available for
commercial scanning products.
● Cons: The main drawback of the active scanning is that the device must be active on the
network, i.e. connected to the network when scanning is performed, which is very difficult
in case of unconstrained devices, as they join and leave the network on random times. Thus
to fingerprint the endpoints, the scanning must be run frequently (or even continuously) to
catch all the devices that join and leave the network. And that on-going scanning can act as
an unintentional DOS attack[4] on the network users, yielding a major drawback associated
with this type of continuous active scanning.
Passive Scanning: On the other hand, the method opposite of active scanning is passive
scanning. In this technique, normal traffic generated by devices on the networkis collected and
analysed. Inspection of this traffic allows one to make a best guess of what kind systems and
services that are connected to the network.
This technique is very commonly used by the IDS (Intrusion Detection Systems) [5] typically
found running on the perimeter of the network. There are various open source tools that can be
leveraged to fingerprint the endpoints by sniffing the traffic, like BRO IDS[6], Snort IDS[7],
Suricata[8], etc.
● Pros: One of the main advantages of the passive scanning is that it is plug and play, i.e. no
knowledge of when and where the devices will be connecting to the network is required,
since as soon as any device connects to the network, it will start generating the network
traffic to communicate on and use the network, which can then be sniffed to determine the
presence on the device. Unlike active scanning, it is non-intrusive, i.e. and there is no threat
of DOSing any legitimate user or services on the network.
● Cons: Since it is dependent on observed traffic patterns, all the cons can be applicable to
passive scanning exist, specifically the reliance on (known) signatures. A potential
attacking end user device can easily modify the traffic pattern to fool the passive scanning
fingerprinting.

3
We will be focusing on the passive scanning technique to build an inventory of the unconstrained
endpoint systems connecting, or ever connected, to the enterprise network, detecting, but not
limited to, and following information pertaining the devices:
● Machine type (PC, Mac, smartphone, access point, printers, odd stuff, etc.)
● Operating system and version (Windows 7, OS X, etc.)
● Browsers in use (User Agent strings)
● Open ports (services)
● Applications and versions
● Dangerous behaviour history (prior loads of known malware)
● Different Plugins (Flash, OpenSSH)
What information is required for the fingerprinting and how to analyse this information to
fingerprint the device will be discussed in next sections.
2. RELATED WORK
Various researches has been done in an effort to draw attention to how crucial it is to have
knowledge of one’s network, especially in terms of endpoints and IoT devices present on the
network, and on an efficient way to detect those end points running in the environment. Rugg and
DeLeeuw in “Increasing Security by Focusing on Endpoints” [9], point out that one of the most
vulnerable targets that an attacker can leverage is the internal endpoints of a network, and that
securing them is one of the key challenges faced by educational organizations, and especially for
those environments where the organization doesn’t have the full control of all the endpoints
connecting to the network. This research, however, is more focused on system hardening and
securing the individual endpoints, by various methods such as encrypting the laptops, deploying
centrally managed anti-virus software, and making sure that the systems are in compliance with
their PCI policy etc. Our research addresses a more realistic approach of cataloguing endpoints,
by passively collecting all the relevant logs that can help identify endpoints in the network for use
in the follow-up incident handling after an attack has been identified, when that kind of
information is required the most, rather than by the almost impossible task of managing or
hardening them individually in an uncontrolled environment.
Yang, et. al. [10] focus on the secure authentication and data communication between IoT devices
by using an RFID-enabled solution aimed at protecting endpoints in the IoT supply chain. The
research mainly focuses on how authentication can be secured in IoT supply chain management
by focusing on the part of the application that can connect and talk to the network. The majority
of the work is focused on mitigating the risk in a limited set of use cases, which is more
applicable in an environment or organizations that share similar use cases and have resources to
implement effective mitigation steps. A more generic approach introduced by Tokuyoshi [11],
helps users understand what the implications are for BYOD policy supporting organizations and
describes the security challenges of monitoring, vetting, and auditing these BYOD devices, and
further highlights the measures for securing the network from un-managed BYOD devices. The
work focuses on important points like enforcing application policy, device policy, and protecting
data on the device that can help mitigate the risk. But again, the authors conclude that these are
very limited measures, and securing the network in the first place and providing means to connect
securely to it are required next generation security measures for BYOD devices. The research
described in our paper closely relates to and extends the ideas suggested by Tokuyoshi, by
providing means of collecting and cataloguing the information available to the security analysts to
take a deeper look at the un-managed devices and to be able to take actions accordingly.

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3. BUILDING THE UEPTSS
When working on this research, we primarily focused on BRO IDS system to gather the majority
of information required to build an inventory for UEPtSS. The reason behind utilizing BRO IDS
is it is open source and free software that can be easily deployed and installed for a proof of
concept (POC) experiment. Also, it comes with built-in scripts deployed with the software to
detect various software and services running on the systems. It also has strong scripting [12] and
logging [13] frameworks which support the writing of custom scripts to determine various
patterns in the traffic, and to generate user friendly logs. More information on BRO IDS can be
found at their site [14].
Other than BRO IDS, there are other various passive scanning tools that can be used for gathering
information for fingerprinting devices, such as Snort, Suricata, etc. Apart from open source and
free tools, if the enterprise already has commercial IDS/IPS systems deployed for network
security monitoring and control, then the logs from those security systems can also be potentially
used to determine the software and services running on enterprise endpoints, such as the logs
from a network based firewall, or web application firewall, or logs from the endpoint
management system.
For the convenience and implementation perspective, BRO was chosen to do the POC of this
research, as it is free and open source project, and hence can be used with minimum deployment
cost in the enterprise.
3.1. LEVERAGE BRO IDS SCRIPTING FRAMEWORK
As mentioned earlier, the BRO IDS has a strong scripting framework. Leveraging it for detecting
various software and operating system versions can be highly useful. BRO comes with some
built-in scripts that detect various kind of software by analysing traffic patterns, which are
enabled by default in the nominal configuration. Apart from these default scripts, we have written
some custom scripts to detect the Mac operating system, and OSX for iPhone. There are few
scripts that are available in custom written package (called Scan-NG package), that we have used
to determine open ports on hosts. Details on which scripts have been used for fingerprinting are
shown in Table 1.
3.2. LEVERAGE BRO IDS LOGGING FRAMEWORK
There are various logs that get generated whenever BRO determines any particular network
traffic pattern, and that information related to the pattern is written in the ASCII log files. When
additional or custom the scripts of interest are loading or enabled in the BRO IDS system, they
also generate logs for the corresponding detections and write them to various log files. Hence, it
is important to know which log files to look at while gathering information for UEPtSS. As the
scripts themselves will do no good if they are not writing the correct information in corresponding
log files. Details on which log files to analyse for fingerprinting are shown in Table 1.

5
Table 1. BRO IDS Scripts and Logs
Scripts to load Logs generated in file Information logged
Windows-version-detection.bro
[15] (built-in)
software.log Operating system and
version
Mac-version-detection.bro[16]
(custom)
software.log Operating system and
version
iPhone-detection.bro[17] (custom) software.log Operating system and
version
Host-profiling.bro[18] (Scan-NG
package)
site_host_open_ports.lo
g
Open ports on a host
Software-browser-plugins.bro[19]
(built-in)
software.log Different browsers and
plugins
Known-services.bro[20] (built-in) known_services.log Known services
Software.bro[21] (built-in) software.log Various
servers/applications
and versions
4. AN INVENTORY OF UNCONSTRAINED ENDPOINTS
Once the above mentioned scripts are loaded and running in the BRO IDS, and the sensors are
placed at a point in network site to be able to observe a majority of the overall traffic, or even the
complete traffic of the enterprise, then the logs will start getting generated and useful information
can then be extracted from the log files, to build an inventory of endpoints and their
characteristics. Furthermore, it is important to note that the key, e.g. as in a database index, in the
log files used to identify a given software or a service corresponding to a device, is the device’s
IP address. And as we know that an IP address can be reused and mapped to many devices during
a period of time on most enterprise networks implementing dynamic addressing (e.g. DHCP), it is
important to know the MAC address of the device that was using that particular IP during the
time of fingerprinting in order to actually pinpoint the device that was running the software or
service at given point in time. Hence, to get the information regarding the MAC address, the best
place to look at is the enterprise DHCP logs. We have used the logs from the DHCP servers, to
map the MAC addresses to the corresponding IP addresses while fingerprint the network.
Also, to collaborate with the detected OS version by the scripts, we have used the freely available
MAC OUI vendor listing from IEEE Standards Public listing (MA-L) from their website [22], to
determine the machine type (manufacturer) for the system i.e. Apple, Dell, etc.
A discussion of the information gathered from the various log files to build the inventory follows.
4.1. GATHERING INFORMATION REGARDING OS AND VERSION
When the Operating System detection scripts are loaded, they start generating the logs in the
software.log file corresponding to the network traffic patterns seen by the device. This
information is useful, as most exploits are targeted towards very specific OS type and do not
unlock themselves when the underlying OS detected is not same as the target OS for the
vulnerability exploitation. Figure 1 is a screenshot showing some of the OS detected by the script.

International Journal of Network
Note the extraction command line at
column in these figures is the time of the observation
Figure 1
4.2. GATHERING INFORMATION
There are many vulnerabilities found
was using during the incident response
can be further narrowed down, specifically in the case of browser specific vulnerabilities.
2is a screenshot showing some of the browsers detected by the scripts.
It is also very crucial to know whether the endpoint is running
versions of applications. This information can then be used for the policy enforcement by the
Note the extraction command line at the top of this and other figures (1-5). Note also the left
column in these figures is the time of the observation in Linux epoch time [23].
Figure 1. Operating System Detection
NFORMATION REGARDING BROWSERS IN USE
found in different browsers. Hence if the browsers that the device
was using during the incident response is known, the scope of the infection or potential exploit
can be further narrowed down, specifically in the case of browser specific vulnerabilities.
a screenshot showing some of the browsers detected by the scripts.
Figure 2. Browser Detection
NFORMATION REGARDING APPLICATIONS AND VERSIONS
It is also very crucial to know whether the endpoint is running the most up to date and supported
Security & Its Applications (IJNSA) Vol. 10, No.2, March 2018
6
Note also the left
in different browsers. Hence if the browsers that the device
, the scope of the infection or potential exploit
can be further narrowed down, specifically in the case of browser specific vulnerabilities. Figure
ERSIONS
up to date and supported

enterprise security and policy compliance to make sure that there
versions of any software or application is running on the enterprise network. This use
policy enforcement will be discussed in more detail in the Usefulness sec
screenshot showing some of the applications detected running on the endpoints.
Figure 3
Sometimes when the user has installed various supporting browser plugins on their browsers, this
information gets advertised whenever the user connects to the network using the browser. Hence,
that information can be sniffed to determine what all browser plugins are available or in
the endpoint. Many times the vulnerabilities
be exploited and can cause harm to the enterprise network, hence this information, together with
other fingerprinting information can be used during a
shows some of the plugin information detected on the endpoints.
Figure 4
terprise security and policy compliance to make sure that there are minimal
of any software or application is running on the enterprise network. This use
policy enforcement will be discussed in more detail in the Usefulness section. Figure 3
screenshot showing some of the applications detected running on the endpoints.
Figure 3. Software Version Detection
NFORMATION REGARDING DIFFERENT BROWSER PLUGINS
installed various supporting browser plugins on their browsers, this
that information can be sniffed to determine what all browser plugins are available or in
the vulnerabilities are present in various plugins that could potentially
other fingerprinting information can be used during an incident triage. Figure 4 is a
shows some of the plugin information detected on the endpoints.
Figure 4. Browser Plug-in Detection
7
are minimal unsupported
of any software or application is running on the enterprise network. This use-case of
Figure 3 is a
LUGINS
installed various supporting browser plugins on their browsers, this
that information can be sniffed to determine what all browser plugins are available or in use by
in various plugins that could potentially
Figure 4 is a screenshot

One of the most important piece
open or the services it is running. This information helps in enumerating the types of services
available on the network and all
Also, it is not typically common
HTTP, or DNS. And hence this information could be useful to
the systems on a given subset of
services open to the internet or not
Again, this use case will be discussed in more detail in the Usefulness section
later. Figure 6 is a screenshot provides a view of the services running on some of the systems.
4.6. PUTTING EVERYTHING T
When the above mentioned component
machine manufacturer information and DHCP logs, a
corresponding the endpoints connecting to the network. Any log aggregation tool can be used to
glue all the information together, with IP address being the primary key in each type of log file to
get an inventory of unconstrained endpoints on the network.
an inventory of systems would look like.
NFORMATION REGARDING OPEN PORTS (KNOWN SERVICES
One of the most important pieces of information regarding an endpoint is open network
all the systems or servers are advertising that service as available.
common for user end systems to be running any kind of services
HTTP, or DNS. And hence this information could be useful to assess what services are open on
the systems on a given subset of the network, and whether these systems should be running those
services open to the internet or not under the enterprise security or acceptable usage policy
Again, this use case will be discussed in more detail in the Usefulness section to be
rovides a view of the services running on some of the systems.
Figure 5. Service Discovery
TOGETHER
component information is recorded in the log files, together with the
machine manufacturer information and DHCP logs, a more complete picture can be realized
rained endpoints on the network. Figure 6 shows a screenshot of what
an inventory of systems would look like.
8
ERVICES)
open network ports
systems or servers are advertising that service as available.
services like SSH,
services are open on
systems should be running those
under the enterprise security or acceptable usage policy.
to be discussed
rovides a view of the services running on some of the systems.
in the log files, together with the
complete picture can be realized
a screenshot of what

Figure 6
5. USEFULNESS OF UEPTSS
There are three main use-cases where the inventory of unconstrained endpoi
They are as follows:
5.1. POLICY ENFORCEMENT
As mentionedbefore, the inventory can be used to determine which applications and their versions
are detected on the enterprise network. This information can be used by the Security and
Compliance team of the enterprise to enforce any particular policy and to make sure that there is
no unsupported software or application is running on the network. For example, from the
inventory, a list of the systems running old OpenSSH[2
for ‘SSH::SERVER‘ keyword, and a notice can be sent to the owner of those devices to update
the software and comply with the policies with the enterprise. Another example could be
searching for OpenSSL[25] versions from the softwar
running old versions of OpenSSL library. Also, if the enterprise has any particular policy for
users to be running specific Operating Systems then policy enforcement can also be used to
ensure that the systems are running recommended operating system by the enterprise.
5.2. ENUMERATING SERVERS/S
Another big advantage of having an inventory of systems running various services, is whenever
somebody wants to know how many servers are on the network that a
service, then this can be quickly found out by searching the inventory for that particular service.
For example, if the security analysts want to know how many DNS servers are running on the
network, or how many HTTP servers are r
restrict the users from running well known services on their locally managed devices. This will be
quick and easy as compared to doing an active scan of the network for that service (like port 53
for DNS or port 80 for http), which could take hours of scanning and could potentially DOS, or
overload the network. This use
providing xyz service on the network, or what all systems have port xx open t
(where xyz and xx can be replaced by any service protocol or port).
Figure 6. Endpoint Aggregate Fingerprint
EPTSS
cases where the inventory of unconstrained endpoints is
inventory, a list of the systems running old OpenSSH[24] can be easily determined by searching
] versions from the software.log file and can get a list of the endpoints
are running recommended operating system by the enterprise.
/SERVICES
somebody wants to know how many servers are on the network that are running any particular
network, or how many HTTP servers are running on the network for enumerating purposes, or to
S or port 80 for http), which could take hours of scanning and could potentially DOS, or
. This use-case helps answer the questions like: what all servers are
providing xyz service on the network, or what all systems have port xx open to the internet
(where xyz and xx can be replaced by any service protocol or port).
9
is very useful.
determined by searching
e.log file and can get a list of the endpoints
are running recommended operating system by the enterprise.
re running any particular
unning on the network for enumerating purposes, or to
S or port 80 for http), which could take hours of scanning and could potentially DOS, or
case helps answer the questions like: what all servers are
o the internet

10
5.3. MALWARE INCIDENT RESPONSE
One of the main use-cases we were looking at when coming up with the idea of UEPtSS, is that if
the information pertaining to a particular system is saved as normal logging activity, then an
extended picture of what the system is and whether it can be affected by malware, can be used for
a preliminary analysis of the incident response. The majority of malware or exploits are targeted
towards a particular OS version, exploiting a particular vulnerability. Hence, if the OS is known
during the time of malware incident response, and what all services and versions were being run
on the system, it can quickly help in steering the investigation in the right direction. For example
one of the hyped ransomware infection, Petya, [26] is particularly targeted towards infecting
Windows systems, and Mac OS X are not affected by it. Hence just knowing what OS the system
is running can help in diagnosing the malware infection.
Apart from these three use cases, the inventory can be used for looking up information regarding
any endpoint for audit or any other purposes. Also, open ports information can be used to audit
the network firewall policies, to know whether the ports are seen open on the devices belonging
to a particular subset of the network that is behind the firewall and shouldn’t have any
communication going on those ports. Hence, to have this information logged in an inventory
would be very useful and help to investigate various network anomalies.
6. CONCLUSIONS
There are many commercial software systems available that provide for fingerprinting the
systems on an enterprise network. All of them require either an agent to be deployed on the client
systems (endpoints) or are based on active scanning. These solutions are targeted towards a
limited set of endpoints, and sometimes have their charging model based on the number of
endpoints that the enterprise wants to fingerprint or keep track of. Hence they work fine when the
number of endpoints in any organization is mostly constant or don’t change. Unlike organizations
like Universities, where students come and go, some graduate every semester and many come as
newly admitted. Hence, in this kind of environment where the number of end users and type
endpoints keep on changing drastically, it becomes harder to deploy any commercial solution to
keep track of the software/application running on almost all the devices that connect and leave the
network. That was the motivation towards starting UEPtSS, as students always come and go,
bring new devices to the University network. And more importantly a diversity of students bring
diverse types of applications local to the students’ native countries, which makes it even more
important to keep track of what all applications are seen on the network, and whether they are
kept up to date or not. Another challenge with any of the commercial solution is the consent of
from the user to agree to deploy any third party software on their devices. And sometimes the
user is not willing to agree to put any third party software on their system and hence an enterprise
can get a lot of resistance in deploying any commercial solution globally in the network. And
finally the last factor to consider in a commercially versus the open source UEPtSS solution is
cost, as some of the commercial solutions pricing is directly proportional to the number of
endpoints, and it becomes very expensive both regarding the pricing and amount of time and
effort required to deploy and maintain these solutions.

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https://www.us-cert.gov/ncas/alerts/TA17-181A
AUTHORS
Ms. Fatema Bannat Wala(MS ECE, UD, 2015; BE Electronics &
Instrumentation Engineering, DAVV University, 2012;CISSP) is PhD candidate in
theDepartment of Electrical and Computer Engineering at the University of
Delaware researching cybersecurity issues. Ms. Bannat Wala, formerly a software
engineer with Accenture, is currently a Security Engineer in UD’s Technical
Security Group (TSG) where she is responsible for the University’s Intrusion
Detection Systems and SIEMs. Ms. Bannat Wala speaks often at security industry
forums and holds the CISSP and is a GIAC Certified Intrusion Analyst (GCIA)
and GIAC Certified Penetration Tester (GPEN).
Over the past 30 years, Dr.Chase Cotton (Ph.D. EE, UD, 1984; BS ME, UT
Austin, 1975; CISSP) has held a variety of research, development and engineering
roles, mostly in telecommunications. In both the corporate and academic worlds,
he has been involved in computer, communications, and security research in roles
including communication carrier executive, product manager, consultant, and
educator for the technologies used in Internet and data services.Since 2008, Dr.
Cotton has been at the University of Delaware in the Department of Electrical and
Computer Engineering. His research interests include cybersecurity and high-
availability software systems with funding drawn from the NSF, ARL, CERDEC, JPMorgan Chase, and
other industrial sponsors. He currently is involved in the ongoing development of a multi-faceted
educational initiative at UD where he is developing new security courses and degree programs including a
minor, graduate Master’s degree, and graduate Certificates in Cybersecurity. Dr. Cotton currently consults
on communications and Internet architectures, software, and security issues for many carriers and
equipment vendors worldwide.

UNCONSTRAINED ENDPOINT SECURITY SYSTEM: UEPTSS

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