[MATTA-2012-001] CVE-2012-1301; 0day; Open Proxy vulnerability in Umbraco 4.7



We don't release 0days... except when vendors show no interest in fixing
their their bugs.

http://umbraco.com/umbraco/dashboard/FeedProxy.aspx?url=http://en.wikipedia.org/wiki/Open_proxy

Have fun.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256



Matta Consulting - Matta Advisory
https://www.trustmatta.com

Umbraco Open Proxy Vulnerability

Advisory ID: MATTA-2012-001
CVE reference: CVE-2012-1301
Affected platforms: Umbraco
Version: 4.x
Date: 2012-January-26
Security risk: High
Vulnerability: Umbraco bundles a script behaving like an open-proxy
Researcher: Florent Daigniere
Vendor Status: Notified
Vulnerability Disclosure Policy:
https://www.trustmatta.com/advisories/matta-disclosure-policy-01.txt
Permanent URL:
https://www.trustmatta.com/advisories/MATTA-2012-001.txt

=====================================================================
Description:

Vulnerable installations of Umbraco allow unauthenticated users to
abuse the script FeedProxy.aspx into proxying requests on their
behalf through the "url" parameter.

=====================================================================
Impact

Anyone with access to the management interface of umbraco can abuse
FeedProxy script into proxying requests for them.

The impact of such vulnerability is difficult to measure and depends
on the specifics of the deployment. Typically, this can allow
attackers to connect to other systems, bypassing controls or be
abused to trick users and browsers into performing actions they
wouldn't otherwise consider (XSS, phishing, ...).

This particular vulnerability can also be abused to create a powerful
Denial of Service: a single recursive proxy-request will take the
application server down and, depending on the configuration of the
server, might severely affect unrelated services.

=====================================================================
Versions affected:

Umbraco version 4.7.0 tested.

=====================================================================
Threat mitigation

Matta consultants recommend deleting the FeedProxy script or
upgrading umbraco to version 5+.

=====================================================================
Credits

This vulnerability was discovered and researched by Florent Daigniere
from Matta Consulting.

=====================================================================
History

26-01-12 initial discovery
21-02-12 initial attempt to contact the vendor
24-02-12 second attempt to contact the vendor
27-02-12 third attempt to contact the vendor
27-02-12 response from the vendor \o/
27-02-12 draft of this advisory is sent to the vendor
29-02-12 CVE-2012-1301 is assigned
05-04-12 publication of the advisory

=====================================================================
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
Tiger Scheme training; conducts regular research and is the developer
behind the webcheck application scanner, and colossus network scanner.

https://www.trustmatta.com
https://www.trustmatta.com/training.html
https://www.trustmatta.com/webapp_va.html
https://www.trustmatta.com/network_va.html

=====================================================================
Disclaimer and Copyright

Copyright (c) 2012 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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)

iQEcBAEBCAAGBQJPfWvwAAoJEG6QUCsisixssyUH/3R6+ziOQBHR9UKiNXfCnGz6
aR6h7tribWMskEb2t6RXGoEB4BS2upnzIqHYz15VbaOCHA3Gs3oUYvvsaQunf+bu
taYuuDW4dHEoHnuTHrcLELmczRDmg0hAnyYaE1oizQikUgnSWJ1zeqTxdh6PH3vi
cXrduM7mBZl2dJpIEOCCDspqxAMkv+qostOBQwW3xlLDKE+eyD+DzwMzWBU9WRXQ
dT6X8tp2MQb4Ut5sp8NOeq5mQlCjFpEMp3XZtekEDofMd3vH0V+1QRwOOZ3an+u1
VOAOIN+1KzRuIPHAH0XUKz07OQOUhD1DGPqFl+Hajk2XO0zh5X7Y0uVQ9KLp8C0=
=rBjG
-----END PGP SIGNATURE-----

Attachment: signature.asc
Description: This is a digitally signed message part



Relevant Pages