The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Genua GenuGate High Resistance Firewall Authentication Bypass
SEC Consult Vulnerability Lab Security Advisory < 20210301-0 >
=======================================================================
title: Authentication bypass vulnerability
product: Genua GenuGate High Resistance Firewall
vulnerable version: GenuGate <10.1 p4, <9.6 p7, <9.0/9.0 Z p19
fixed version: GenuGate 10.1 p4 (G1010_004), 9.6 p7 (G960_007)
9.0 and 9.0 Z p19 (G900_019)
CVE number: CVE-2021-27215
impact: critical
homepage: https://www.genua.de/en/it-security-solutions/high-resistance-firewall-genugate
found: 2021-01-28
by: Armin Stock (Atos Germany)
SEC Consult Vulnerability Lab
An integrated part of SEC Consult, an Atos company
Europe | Asia | North America
https://www.sec-consult.com
=======================================================================
Vendor description:
-------------------
"genugate Firewall: Well Protected Against Attacks
Your level of IT security is determined largely at the interface between the
Internet and the local network. The attacks from the outside and the data
sent from the inside pass through this point.
The High Resistance Firewall genugate satisfies the highest requirements:
two different firewall systems an application level gateway and
a packet filter, each on separate hardware are combined to form a compact
solution. genugate is approved for classification levels German and NATO
RESTRICTED and RESTREINT UE/EU RESTRICTED. genugate is certified according
to CC EAL 4+"
URL: https://www.genua.de/en/it-security-solutions/high-resistance-firewall-genugate
Business recommendation:
------------------------
The vendor provides a patched version for the affected products which should
be installed immediately.
Customers should also adhere to security best practices such as network
segmentation and limiting access to the admin panel. This is also a requirement
for certified and approved environments.
Vulnerability overview/description:
-----------------------------------
1) Authentication bypass vulnerability (CVE-2021-27215)
The Admin Web interface, the Sidechannel Web and Userweb interface can use different
methods to perform the authentication of a user. A specific authentication method during
login does not check the provided data and returns OK for any authentication request. This
allows an attacker to login to the admin panel with a user of his choice, e.g the root
user with highest privileges or even a non-existing user.
An attacker needs to have network access to the admin interface. Certified and approved
environments mandate that the admin interface is only reachable through a strictly
separated network. Nevertheless, it is a highly critical security vulnerability and
must be patched immediately.
Proof of concept:
-----------------
1) Authentication bypass vulnerability (CVE-2021-27215)
During the authentication requests at the login page of the admin web interface, the
Sidechannel Web and Userweb interface, certain HTTP POST parameters are passed to the
server. By manipulating a specific parameter method, an attacker is able to bypass
the authentication easily and login as arbitrary user.
[ Detailed proof of concept removed ]
A proof of concept video is available at https://youtu.be/Wfj3-6UBkzg
Vulnerable / tested versions:
-----------------------------
The versions 9.6 p0 and 9.6 p6 of the Genua GenuGate firewall were tested and found
to be vulnerable. The p6 version was the latest version at the time of discovery.
The supported and released product versions 9.0, 9.0 Z and 10.1 are affected as well.
Vendor contact timeline:
------------------------
2021-01-29 | Contacting vendor through [email protected]
Asking for an S/MIME certificate or GnuGP key to be able to send
an encrypted report
2021-01-29 | Received GnuGP key from vendor and sent encrypted (PGP) report.
2021-01-29 | Vendor confirmed the issue and is working on a patch.
2021-02-02 | Vendor released a patch for the affected products.
2021-02-15 | Informing CERT-Bund and CERT.at about the upcoming advisory release.
2021-02-17 | Coordination call with vendor.
2021-03-01 | Coordinated release of security advisory.
Solution:
---------
The vendor provides a patched version for the affected and supported products
which should be installed immediately.
The patch can be downloaded in genugate GUI or by calling 'getpatches'
on the command line interface.
Additional information can be viewed at the vendor's support page:
https://kunde.genua.de/en/overview/genugate.html
Workaround:
-----------
None
Advisory URL:
-------------
https://sec-consult.com/vulnerability-lab/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SEC Consult Vulnerability Lab
SEC Consult, an Atos company
Europe | Asia | North America
About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult, an
Atos company. It ensures the continued knowledge gain of SEC Consult in the
field of network and application security to stay ahead of the attacker. The
SEC Consult Vulnerability Lab supports high-quality penetration testing and
the evaluation of new offensive and defensive technologies for our customers.
Hence our customers obtain the most current information about vulnerabilities
and valid recommendation about the risk profile of new technologies.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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EOF A. Stock / @2021
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