Matta Consulting - Matta Advisory
http://www.trustmatta.com
Cisco Unified Videoconferencing multiple vulnerabilities
Advisory ID: MATTA-2010-001
CVE reference: CVE-2010-3037 CVE-2010-3038
Affected platforms: Cisco Unified Videoconferencing 3515,3522,3527,5230,3545,
5110,5115 Systems and unspecified Radvision systems
Version: 7.0.1.13.3 at least and more likely all
Date: 2010-August-03
Security risk: Critical
Exploitable from: Remote
Vulnerability: Multiple vulnerabilities
Researcher: Florent Daigniere
Vendor Status: Notified, working on a patch
Vulnerability Disclosure Policy:
http://www.trustmatta.com/advisories/matta-disclosure-policy-01.txt
Permanent URL:
http://www.trustmatta.com/advisories/MATTA-2010-001.txt
=====================================================================
Description:
During an external pentest exercise for one of our clients, multiple
vulnerabilities and weaknesses were found on the Cisco CUVC-5110-HD10 which
allowed us to ultimately gain access to the internal network.
- - Hard-coded credentials - CVE-2010-3038
Three accounts have a login shell and a password the administrator can neither
disable nor change. The affected accounts are "root", "cs" and "develop".
Matta didn't spend the CPU cycles required to get those passwords but will
provide the salted hashes to interested parties. The credentials can be used
against both the FTP and the SSH daemon running on the device.
- - Services misconfiguration
There is an FTP daemon (vsftpd) running but no mention in the documentation
of what it might be useful for. User credentials created from the
web-interface allow to explore the filesystem/firmware of the device.
The file /etc/shadow has read permissions for all.
The ssh daemon (openssh) has a non-default but curious configuration. It
allows port-forwarding and socks proxies to be created, X11 to be
forwarded... even with the restricted shells.
The daemon binding the port of the web-interface is running as root.
- - Weak session IDs on the web interface
Session IDs are timestamps of when the user logged-in and are trivial to
forge. There are numerous ways of remotely gathering the remote time and
uptime, the easiest being to ask over RPC... Assuming that a user or an
administrator logged into the device shortly after it was powered up, and
that the network connectivity is fast, it is practical to bruteforce a
valid session id.
Using this vulnerability, a non-authenticated attacker can authenticate.
- - Usage of cookies to store credentials
Credentials to access the web interface are stored in base64 format in the
cookie sent by the browser. Over http in default configuration. While users
are not expected to reuse their credentials, in practice they do; this is
an information-disclosure bug.
- - Remote Command Injection on the web-interface - CVE-2010-3037
The script at /goform/websXMLAdminRequestCgi.cgi is vulnerable to remote
command injection (post authentication). Many parameters can be abused,
including but not limited to the "username" field. Obviously, as the
webserver is running as root, it can lead to complete compromise of the
device.
- - Weak obfuscation of credentials
The configuration file /opt/rv/Versions/CurrentVersion/Mcu/Config/Mcu.val
contains obfuscated passwords which are trivial to reveal. This is an
information-disclosure bug. Best practices recommend using PBKDF2 to store
passwords.
=====================================================================
Impact
If successful, a malicious third party can get full control of the device and
harvest user passwords with little to no effort. The Attacker might
reposition and launch an attack against other parts of the target
infrastructure from there.
=====================================================================
Versions affected:
Firmware version 7.0.1.13.3 tested. All deployed versions are probably
vulnerable.
=====================================================================
Threat mitigation
Until a patch is issued by the vendor, Matta recommends you unplug the
device from its network socket.
=====================================================================
Base64 encoded decryption script for the credentials: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==
=====================================================================
Credits
This vulnerability was discovered and researched by Florent Daigniere from
Matta Consulting.
Thank you to Paul Oxman and Matthew Cerha from the Cisco PSIRT for the
coordination effort.
=====================================================================
History
30-07-10 initial discovery
05-08-10 our client has mitigated the risk for his infrastructure
...
23-08-10 initial attempt to contact the vendor
23-08-10 sent pre-advisory to the vendor
PSIRT on psirt@xxxxxxxxx using PGP id 0xCF14FEE0
23-08-10 reply from the vendor, case PSIRT-0217563645 is open
...
21-09-10 agreement on the public disclosure date
...
08-11-10 planned disclosure date (missed), CVE assignments
...
17-11-10 public disclosure
=====================================================================
About Matta
Matta is a privately held company with Headquarters in London, and a European
office in Amsterdam. Established in 2001, Matta operates in Europe, Asia,
the Middle East and North America using a respected team of senior
consultants. Matta is an accredited provider of Tigerscheme training;
conducts regular research and is the developer behind the webcheck
application scanner, and colossus network scanner.
http://www.trustmatta.com
http://www.trustmatta.com/webapp_va.html
http://www.trustmatta.com/network_va.html
=====================================================================
Disclaimer and Copyright
Copyright (c) 2010 Matta Consulting Limited. All rights reserved.
This advisory may be distributed as long as its distribution is
free-of-charge and proper credit is given.
The information provided in this advisory is provided "as is" without
warranty of any kind. Matta Consulting disclaims all warranties, either
express or implied, including the warranties of merchantability and fitness
for a particular purpose. In no event shall Matta Consulting or its
suppliers be liable for any damages whatsoever including direct, indirect,
incidental, consequential, loss of business profits or special damages,
even if Matta Consulting or its suppliers have been advised of the
possibility of such damages.
Attachment:
signature.asc
Description: This is a digitally signed message part