[guru] Cisco biztonsagi frissitesek
DATE: Thu, 31 Dec 2009 00:13:39 +0100
A TLS renegotiation segítségével kihasználható injection hibákról a Cisco
is kiadott egy leírást.
Több buffer overflow hibát is találtak a Cisco WebEx Recording Format (WRF)
Player alkalmazásban.
A Cisco ASA VPN SSL URL védelme gyenge, a támadó könnyen tud olyan URL-t
fabrikálni, amit az eszköz érvényesnek fogad el és átenged magán.
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Cisco Security Advisory: Transport Layer Security Renegotiation
Vulnerability
Advisory ID: cisco-sa-20091109-tls
http://www.cisco.com/warp/public/707/cisco-sa-20091109-tls.shtml
Revision 1.0
For Public Release 2009 November 9 1600 UTC (GMT)
Summary
=======
An industry-wide vulnerability exists in the Transport Layer Security
(TLS) protocol that could impact any Cisco product that uses any version
of TLS and SSL. The vulnerability exists in how the protocol handles
session renegotiation and exposes users to a potential man-in-the-middle
attack.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20091109-tls.shtml.
Affected Products
=================
Cisco is currently evaluating products for possible exposure to these
TLS issues. Products will only be listed in the Vulnerable Products or
Products Confirmed Not Vulnerable sections of this advisory when a final
determination about product exposure is made. Products that are not
listed in either of these two sections are still being evaluated.
Vulnerable Products
- -------------------
This section will be updated when more information is available.
Products Confirmed Not Vulnerable
- ---------------------------------
The following products are confirmed not vulnerable:
* Cisco AnyConnect VPN Client
This section will be updated when more information is available.
Details
=======
TLS and its predecessor, SSL, are cryptographic protocols that provide
security for communications over IP data networks such as the Internet.
An industry-wide vulnerability exists in the TLS protocol that could
impact any Cisco product that uses any version of TLS and SSL. The
vulnerability exists in how the protocol handles session renegotiation
and exposes users to a potential man-in-the-middle attack.
The following Cisco Bug IDs are being used to track potential exposure
to the SSL and TLS issues. The bugs listed below do not confirm
that a product is vulnerable, but rather that the product is under
investigation by the appropriate product teams.
Registered Cisco customers can view these bugs via Cisco's Bug Toolkit:
http://www.cisco.com/pcgi-bin/Support/Bugtool/launch_bugtool.pl
+------------------------------------------------------------+
| Product | Bug ID |
|----------------------------+-------------------------------|
| Cisco Adaptive Security | CSCtd01491 |
| Device Manager (ASDM) | |
|----------------------------+-------------------------------|
| Cisco AON Software | CSCtd01646 |
| | |
|----------------------------+-------------------------------|
| Cisco AON Healthcare for | CSCtd01652 |
| HIPAA and ePrescription | |
|----------------------------+-------------------------------|
| Cisco Application and | CSCtd01529 |
| Content Networking System | |
| (ACNS) Software | |
|----------------------------+-------------------------------|
| Cisco Application | CSCtd01480 |
| Networking Manager | |
|----------------------------+-------------------------------|
| Cisco ASA 5500 Series | CSCtd00697 |
| Adaptive Security | |
| Appliances | |
|----------------------------+-------------------------------|
| Cisco ASA Advanced | |
| Inspection and Prevention | CSCtd01539 |
| (AIP) Security Services | |
| Module | |
|----------------------------+-------------------------------|
| Cisco AVS 3100 Series | CSCtd01566 |
| Application Velocity | |
| System | |
|----------------------------+-------------------------------|
| Cisco Catalyst 6500 Series | CSCtd06389 |
| SSL Services Module | |
|----------------------------+-------------------------------|
| Firewall Services Module | CSCtd04061 |
| FWSM | |
|----------------------------+-------------------------------|
| Cisco CSS 11000 Series | CSCtd01636 |
| Content Services Switches | |
|----------------------------+-------------------------------|
| Cisco Unified SIP Phones | CSCtd01446 |
| | |
|----------------------------+-------------------------------|
| Cisco Data Center Network | CSCtd02635 |
| Manager | |
|----------------------------+-------------------------------|
| Cisco Data Mobility | CSCtd02642 |
| Manager | |
|----------------------------+-------------------------------|
| Cisco Digital Media | CSCtd01703 |
| Encoders | |
|----------------------------+-------------------------------|
| Cisco Digital Media | CSCtd01692 |
| Manager | |
|----------------------------+-------------------------------|
| Cisco Digital Media | CSCtd01718 |
| Players | |
|----------------------------+-------------------------------|
| Cisco Emergency Responder | CSCtd02650 |
| | |
|----------------------------+-------------------------------|
| Cisco IOS Software | CSCtd00658 |
| | |
|----------------------------+-------------------------------|
| Cisco IOS XE Software | CSCtd00658 |
| | |
|----------------------------+-------------------------------|
| Cisco IOS XR Software | CSCtd02658 |
| | |
|----------------------------+-------------------------------|
| Cisco IP Communicator | CSCtd02662 |
| | |
|----------------------------+-------------------------------|
| CATOS | CSCtd00662 |
| | |
|----------------------------+-------------------------------|
| Cisco IronPort Appliances | CSCtd02069 |
| | |
|----------------------------+-------------------------------|
| Cisco Unified MeetingPlace | CSCtd02709 |
| | |
|----------------------------+-------------------------------|
| Cisco NAC Appliance (Clean | CSCtd01453 |
| Access) | |
|----------------------------+-------------------------------|
| Cisco NAC Guest Server | CSCtd01462 |
| | |
|----------------------------+-------------------------------|
| Cisco NAC Profiler | CSCtd02716 |
| | |
|----------------------------+-------------------------------|
| Cisco Network Analysis | CSCtd02729 |
| Module Software (NAM) | |
|----------------------------+-------------------------------|
| Cisco Network Registrar | CSCtd02748 |
| | |
|----------------------------+-------------------------------|
| Cisco ONS 15500 Series | CSCtd02769 |
| | |
|----------------------------+-------------------------------|
| Cisco Physical Access | CSCtd02777 |
| Gateways | |
|----------------------------+-------------------------------|
| Cisco Physical Access | CSCtd03912 |
| Manager | |
|----------------------------+-------------------------------|
| Cisco Physical Security | CSCtd03920 |
| ISM | |
|----------------------------+-------------------------------|
| Cisco QoS Device Manager | CSCtd03923 |
| | |
|----------------------------+-------------------------------|
| Cisco Secure Access | CSCtd00725 |
| Control Server (ACS) | |
|----------------------------+-------------------------------|
| Cisco Secure Desktop | CSCtd03928 |
| | |
|----------------------------+-------------------------------|
| Cisco Secure Services | CSCtd03935 |
| Client | |
|----------------------------+-------------------------------|
| Cisco Security Agent CSA | CSCtd02689 |
| | |
|----------------------------+-------------------------------|
| Cisco Security Monitoring, | CSCtd02654 |
| Analysis and Response | |
| System (MARS) | |
|----------------------------+-------------------------------|
| Cisco Unified IP Phones | CSCtd04121 |
| | |
|----------------------------+-------------------------------|
| Cisco Service Control | CSCtd04171 |
| Subscriber Manager | |
|----------------------------+-------------------------------|
| Cisco TelePresence Manager | CSCtd01771 |
| | |
|----------------------------+-------------------------------|
| Telepresence for Consumer | CSCtd01752 |
| | |
|----------------------------+-------------------------------|
| Cisco TelePresence | CSCtd01742 |
| Recording Server | |
|----------------------------+-------------------------------|
| Cisco Network Asset | CSCtd04198 |
| Collector | |
|----------------------------+-------------------------------|
| Cisco Unified | CSCtd01282 |
| Communications Manager | |
| (CallManager) | |
|----------------------------+-------------------------------|
| Cisco Unified Business | CSCtd05731 |
| Attendant Console | |
|----------------------------+-------------------------------|
| Cisco Unified Contact | CSCtd05790 |
| Center Enterprise | |
|----------------------------+-------------------------------|
| Cisco Unified Contact | CSCtd05790 |
| Center Express | |
|----------------------------+-------------------------------|
| Cisco Unified Contact | CSCtd05755 |
| Center Management Portal | |
|----------------------------+-------------------------------|
| Cisco Unified Contact | CSCtd05790 |
| Center Products | |
|----------------------------+-------------------------------|
| Cisco Unified Department | CSCtd05733 |
| Attendant Console | |
|----------------------------+-------------------------------|
| Cisco Unified E-Mail | CSCtd05756 |
| Interaction Manager | |
|----------------------------+-------------------------------|
| Cisco Unified Enterprise | CSCtd05735 |
| Attendant Console | |
|----------------------------+-------------------------------|
| Cisco Unified Mobile | CSCtd05762 |
| Communicator | |
|----------------------------+-------------------------------|
| Cisco Unified Mobility | CSCtd05786 |
| | |
|----------------------------+-------------------------------|
| Cisco Unified Mobility | CSCtd05783 |
| Advantage | |
|----------------------------+-------------------------------|
| Cisco Unified Operations | CSCtd05784 |
| Manager | |
|----------------------------+-------------------------------|
| Cisco Unified Personal | CSCtd05759 |
| Communicator | |
|----------------------------+-------------------------------|
| Cisco Unified Presence | CSCtd05791 |
| | |
|----------------------------+-------------------------------|
| Cisco Unified Provisioning | CSCtd05777 |
| Manager | |
|----------------------------+-------------------------------|
| Cisco Unified Quick | CSCtd05738 |
| Connect | |
|----------------------------+-------------------------------|
| Cisco Unified Service | CSCtd05780 |
| Monitor | |
|----------------------------+-------------------------------|
| Cisco Unified Service | CStCd05778 |
| Statistics Manager | |
|----------------------------+-------------------------------|
| Cisco Unified SIP Proxy | CSCtd05765 |
| | |
|----------------------------+-------------------------------|
| Cisco Unity | CSCtd02855 |
| | |
|----------------------------+-------------------------------|
| Cisco NX-OS Software | CSCtd00699 and CSCtd00703 |
| | |
|----------------------------+-------------------------------|
| Cisco Video Portal | CSCtd04097 |
| | |
|----------------------------+-------------------------------|
| Cisco Video Surveillance | CSCtd02831 |
| Media Server Software | |
|----------------------------+-------------------------------|
| Cisco Video Surveillance | CSCtd02780 |
| Operations Manager | |
| Software | |
|----------------------------+-------------------------------|
| Cisco Wide Area File | CSCtd04106 |
| Services Software (WAFS) | |
|----------------------------+-------------------------------|
| Cisco Wireless Control | CSCtd01625 |
| System | |
|----------------------------+-------------------------------|
| Cisco Wireless LAN | CSCtd01611 |
| Controller (WLAN) | |
|----------------------------+-------------------------------|
| Cisco Wireless Location | CSCtd04115 |
| Appliance | |
|----------------------------+-------------------------------|
| CiscoWorks Common Services | CSCtd01597 |
| Software | |
|----------------------------+-------------------------------|
| CiscoWorks Wireless LAN | CSCtd04111 |
| Solution Engine (WLSE) | |
+------------------------------------------------------------+
This vulnerability has been assigned the Common Vulnerabilities and
Exposures (CVE) identifier CVE-2009-3555.
Vulnerability Scoring Details
+----------------------------
Cisco has provided scores for the vulnerability in this advisory based
on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in
this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of the
vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS
at:
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at:
http://intellishield.cisco.com/security/alertmanager/cvss
* TLS Renegotiation Vulnerability (all Cisco Bugs above)
CVSS Base Score - 4.3
Access Vector - Network
Access Complexity - Medium
Authentication - None
Confidentiality Impact - None
Integrity Impact - Partial
Availability Impact - None
CVSS Temporal Score - 4.1
Exploitability - Functional
Remediation Level - Unavailable
Report Confidence - Confirmed
Impact
======
This section will be updated when more information is available.
Software Versions and Fixes
===========================
This section will be updated to include fixed software versions for
affected Cisco products as they become available.
Workarounds
===========
Workarounds are being investigated. This section will be updated when
more information becomes available.
Obtaining Fixed Software
========================
Cisco has released free software updates that address this
vulnerability. Prior to deploying software, customers should consult
their maintenance provider or check the software for feature set
compatibility and known issues specific to their environment.
Customers may only install and expect support for the feature
sets they have purchased. By installing, downloading, accessing
or otherwise using such software upgrades, customers agree to be
bound by the terms of Cisco's software license terms found at
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
or as otherwise set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
Do not contact psirt@cisco.com or security-alert@cisco.com for software
upgrades.
Customers with Service Contracts
- --------------------------------
Customers with contracts should obtain upgraded software through their
regular update channels. For most customers, this means that upgrades
should be obtained through the Software Center on Cisco's worldwide
website at http://www.cisco.com.
Customers using Third Party Support Organizations
- -------------------------------------------------
Customers whose Cisco products are provided or maintained through prior
or existing agreements with third-party support organizations, such
as Cisco Partners, authorized resellers, or service providers should
contact that support organization for guidance and assistance with the
appropriate course of action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific
customer situations, such as product mix, network topology, traffic
behavior, and organizational mission. Due to the variety of affected
products and releases, customers should consult with their service
provider or support organization to ensure any applied workaround or fix
is the most appropriate for use in the intended network before it is
deployed.
Customers without Service Contracts
- -----------------------------------
Customers who purchase direct from Cisco but do not hold a Cisco service
contract, and customers who purchase through third-party vendors but are
unsuccessful in obtaining fixed software through their point of sale
should acquire upgrades by contacting the Cisco Technical Assistance
Center (TAC). TAC contacts are as follows.
* +1 800 553 2447 (toll free from within North America)
* +1 408 526 7209 (toll call from anywhere in the world)
* e-mail: tac@cisco.com
Customers should have their product serial number available and be
prepared to give the URL of this notice as evidence of entitlement to a
free upgrade. Free upgrades for non-contract customers must be requested
through the TAC.
Refer to
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
for additional TAC contact information, including localized telephone
numbers, and instructions and e-mail addresses for use in various
languages.
Exploitation and Public Announcements
=====================================
This vulnerability was initially discovered by Marsh Ray and Steve
Dispensa from PhoneFactor, Inc.
Cisco is not aware of any malicious exploitation of this vulnerability.
Proof-of-concept exploit code has been published for this vulnerability.
Status of this Notice: INTERIM
==============================
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY
ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that omits
the distribution URL in the following section is an uncontrolled copy,
and may lack important information or contain factual errors.
Distribution
============
This advisory is posted on Cisco's worldwide website at:
http://www.cisco.com/warp/public/707/cisco-sa-20091109-tls.shtml
In addition to worldwide web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the following
e-mail and Usenet news recipients.
* cust-security-announce@cisco.com
* first-bulletins@lists.first.org
* bugtraq@securityfocus.com
* vulnwatch@vulnwatch.org
* cisco@spot.colorado.edu
* cisco-nsp@puck.nether.net
* full-disclosure@lists.grok.org.uk
* comp.dcom.sys.cisco@newsgate.cisco.com
Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on mailing
lists or newsgroups. Users concerned about this problem are encouraged
to check the above URL for any updates.
Revision History
================
+------------------------------------------------------------+
| Revision 1.0 | 2009-November-9 | Initial public release |
+------------------------------------------------------------+
Cisco Security Procedures
=========================
Complete information on reporting security vulnerabilities
in Cisco products, obtaining assistance with security
incidents, and registering to receive security information
from Cisco, is available on Cisco's worldwide website at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
This includes instructions for press inquiries regarding
Cisco security notices. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.
+--------------------------------------------------------------------
Copyright 2008-2009 Cisco Systems, Inc. All rights reserved.
+--------------------------------------------------------------------
Updated: Nov 09, 2009 Document ID: 111046
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Cisco Security Advisory: Multiple Cisco WebEx WRF Player Vulnerabilities
Advisory ID: cisco-sa-20091216-webex
http://www.cisco.com/warp/public/707/cisco-sa-20091216-webex.shtml
Revision 1.0
For Public Release 2009 December 16 1600 UTC (GMT)
Summary
=======
Multiple buffer overflow vulnerabilities exist in the Cisco WebEx
Recording Format (WRF) Player. In some cases, exploitation of the
vulnerabilities could allow a remote attacker to execute arbitrary code
on the system of a targeted user.
The Cisco WebEx WRF Player is an application that is used to play back
WebEx meeting recordings that have been recorded on the computer of an
on-line meeting attendee. The WRF Player can be automatically installed
when the user accesses a WRF file that is hosted on a WebEx server. The
WRF Player can also be manually installed for offline playback after
downloading the application from www.webex.com.
If the WRF Player was automatically installed, the WebEx WRF Player
will be automatically upgraded to the latest, non-vulnerable version
when users access a WRF file hosted on a WebEx server. If the WebEx
WRF Player was manually installed, users will need to manually install
a new version of the player after downloading the latest version from
www.webex.com.
Cisco has released free software updates that address these
vulnerabilities.
This advisory is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20091216-webex.shtml.
Affected Products
=================
Vulnerable Products
- -------------------
The vulnerabilities disclosed in this advisory affect the Cisco WebEx
WRF Player. Microsoft Windows, Apple Mac OS X, and Linux versions of the
player are affected. Affected versions of the WRF Player are those prior
to the "first fixed" versions, which are shown in the section "Software
Versions and Fixes" of this advisory.
To check if a Cisco WebEx server is running an affected version of the
WebEx client build, users can log in to their Cisco WebEx server and go
to the Support -> Downloads section. The version of the WebEx client
build will be displayed on the right-hand side of the page under "About
Support Center", for example "Client build: 27.11.0.3328".
There is no way to check if a manually installed version of the WRF
Player is affected by these vulnerabilities. Therefore, Cisco recommends
that users upgrade to the most current version of the player that is
available from http://www.webex.com/downloadplayer.html.
Products Confirmed Not Vulnerable
- ---------------------------------
The Cisco WebEx Player for the WebEx Advanced Recording Format (ARF)
file format is not affected by these vulnerabilities.
No other Cisco products are currently known to be affected by these
vulnerabilities.
Details
=======
The WebEx meeting service is a hosted multimedia conferencing solution
that is managed by and maintained by Cisco WebEx. The WebEx Recording
Format (WRF) is a file format that is used to store WebEx meeting
recordings that have been recorded on the computer of an on-line meeting
attendee. The WRF Player is an application that is used to play back
and edit WRF files (files with .wrf extensions). The WRF Player can be
automatically installed when the user accesses a WRF file that is hosted
on a WebEx server (stream playback mode). The WRF Player can also be
manually installed after downloading the application from www.webex.com
to play back WRF files locally (offline playback mode).
Multiple buffer overflow vulnerabilities exist in the WRF Player. The
vulnerabilities may lead to a crash of the WRF Player application, or in
some cases, lead to remote code execution.
To exploit a vulnerability, a malicious WRF file would need to be opened
by the WRF Player application. An attacker may be able to accomplish
this by providing the malicious WRF file directly to users (for example,
via e-mail), or by convincing users to visit a malicious website. The
vulnerability cannot be triggered by users attending a WebEx meeting.
These vulnerabilities have been assigned the following Common
Vulnerabilities and Exposures (CVE) identifiers:
* CVE-2009-2875
* CVE-2009-2876
* CVE-2009-2877
* CVE-2009-2878
* CVE-2009-2879
* CVE-2009-2880
Vulnerability Scoring Details
=============================
Cisco has provided scores for the vulnerabilities in this advisory based
on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in
this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability
severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then
compute environmental scores to assist in determining the impact of the
vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS
at:
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to help compute the
environmental impact for individual networks at:
http://intellishield.cisco.com/security/alertmanager/cvss
* Multiple Cisco WebEx Player Buffer Overflow Vulnerabilities (all
vulnerabilities in this advisory)
CVSS Base Score - 9.3
Access Vector - Network
Access Complexity - Medium
Authentication - None
Confidentiality Impact - Complete
Integrity Impact - Complete
Availability Impact - Complete
CVSS Temporal Score - 7.7
Exploitability - Functional
Remediation Level - Official-Fix
Report Confidence - Confirmed
Impact
======
Successful exploitation of the vulnerabilities described in this
document could result in a crash of the Cisco WebEx WRF Player
application, and in some cases, allow a remote attacker to execute
arbitrary code on the targeted system with the privileges of the user
running the WRF Player application.
Software Versions and Fixes
===========================
The table below contains "First Fixed" information for the Cisco WebEx
WRF Player that is automatically downloaded from a WebEx site when a WRF
hosted on a WebEx site is accessed (stream playback mode). Fixes are
cumulative within a major release so for example, if release 27.10.1 is
fixed, then release 27.10.2 will have the fix too.
+------------------------------------------------------------+
| Platform | Major Release 26.x | Major Release 27.x |
|-----------+---------------------+--------------------------|
| Microsoft | 26.49.32; available | 27.10.x; available now |
| Windows | now except lockdown | for non-PSO and |
| | sites | non-lockdown sites |
|-----------+---------------------+--------------------------|
| | 26.49.35; available | 27.11.8; available now |
| Mac OS X | early February 2010 | for non-PSO and |
| | | non-lockdown sites |
|-----------+---------------------+--------------------------|
| | 26.49.35; available | 27.11.8; available now |
| Linux | early February 2010 | for non-PSO and |
| | | non-lockdown sites |
+------------------------------------------------------------+
PSO and lockdown sites running 27.x will receive the fixes for these
vulnerabilities during the next emergency patching (EP) cycle. This
advisory will be updated to indicate a specific timeline once one is
available.
If the WRF Player was automatically installed, the WebEx WRF Player will
be automatically upgraded to the latest, non-vulnerable version when
users access a WRF file hosted on a WebEx server.
If the WebEx WRF Player was manually installed, users will need to
manually install a new version of the player after downloading the
latest version from www.webex.com.
Workarounds
===========
There are no workarounds for the vulnerabilities disclosed in this
advisory.
Obtaining Fixed Software
========================
Cisco has released free software updates that address these
vulnerabilities. Prior to deploying software, customers should consult
their maintenance provider or check the software for feature set
compatibility and known issues specific to their environment.
Customers may only install and expect support for the feature
sets they have purchased. By installing, downloading, accessing
or otherwise using such software upgrades, customers agree to be
bound by the terms of Cisco's software license terms found at
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
or as otherwise set forth at Cisco.com Downloads at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
Do not contact psirt@cisco.com or security-alert@cisco.com for software
upgrades.
Customers that need additional information can contact WebEx Global
Support Services and Technical Support. WebEx Global Support Services
and Technical Support can be reached through the WebEx support site at
http://support.webex.com/support/support-overview.html or by phone at
+1-866-229-3239 or +1-408-435-7088.
Customers outside of the United States can reference the following link
for local support numbers:
http://support.webex.com/support/phone-numbers.html
Exploitation and Public Announcements
=====================================
The Cisco PSIRT is not aware of malicious use of the vulnerabilities
described in this advisory.
These vulnerabilities were discovered and reported to Cisco by Xiaopeng
Zhang and Zhenhua Liu of Fortinet's FortiGuard Labs. The FortiGuard Labs
advisory is available at http://www.fortiguard.com. Cisco would like to
thank FortiGuard Labs for reporting these vulnerabilities to us and for
working with us on a coordinated disclosure.
Status of this Notice: FINAL
============================
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY
ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that omits
the distribution URL in the following section is an uncontrolled copy,
and may lack important information or contain factual errors.
Distribution
============
This advisory is posted on Cisco's worldwide website at:
http://www.cisco.com/warp/public/707/cisco-sa-20091216-webex.shtml
In addition to worldwide web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the following
e-mail and Usenet news recipients.
* cust-security-announce@cisco.com
* first-bulletins@lists.first.org
* bugtraq@securityfocus.com
* vulnwatch@vulnwatch.org
* cisco@spot.colorado.edu
* cisco-nsp@puck.nether.net
* full-disclosure@lists.grok.org.uk
* comp.dcom.sys.cisco@newsgate.cisco.com
Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on mailing
lists or newsgroups. Users concerned about this problem are encouraged
to check the above URL for any updates.
Revision History
================
+------------------------------------------------------------+
| Revision 1.0 | 2009-December-16 | Initial public release |
+------------------------------------------------------------+
Cisco Security Procedures
=========================
Complete information on reporting security vulnerabilities in
Cisco products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's worldwide website at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
This includes instructions for press inquiries regarding Cisco security
notices. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.
+--------------------------------------------------------------------
Copyright 2008-2009 Cisco Systems, Inc. All rights reserved.
+--------------------------------------------------------------------
Updated: Dec 16, 2009 Document ID: 110946
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INTERNET SECURITY AUDITORS ALERT 2009-013
- Original release date: December 7th, 2009
- Last revised: December 16th, 2009
- Discovered by: David Eduardo Acosta Rodriguez
- Severity: 4/10 (CVSS Base Score)
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I. VULNERABILITY
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Cisco ASA <= 8.x VPN SSL module Clientless URL-list control bypass
II. BACKGROUND
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Cisco VPN SSL [1] is a module for Cisco ASA and Cisco Integrated
Services Routers to extend network resources to virtually any remote
user with access to the Internet and a web browser.
III. DESCRIPTION
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Cisco VPN SSL Clientless lets administrators define rules to specific
targets within the private network that WebVPN users will be able to
access. This specific targets are published using links in VPN SSL
home page. These links (URL) are protected (obfuscated) using a ROT13
substitution[2] and converting ASCII characters to hexadecimal. An
user with a valid account and without "URL entry" can access any
internal/external resource simply taken an URL, encrypt with ROT 13,
convert ASCII characters to hexadecimal and appending this string to
Cisco VPN SSL URL.
IV. PROOF OF CONCEPT
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Using URL http://intranet published on internal server (not accessible
from home page):
1. Convert string to ROT13: uggc://vagenarg
2. Change ASCII chars to HEX: 756767633a2f2f766167656e617267
3. Append string to Cisco VPN SSL:
https://[CISCOVPNSSL]/+CSCO+00756767633a2f2f766167656e617267++
This is a simple PoC for easy demonstration:
#!/bin/bash
echo -n "write URL:"
read a
b=`echo -n $a | tr '[a-m][n-z][A-M][N-Z]' '[n-z][a-m][N-Z][A-M]' | od
-tx1 | cut -c8- | sed 's/ //g'` | paste -s -d '';
echo -n "URL "
echo -n "https://[CISCOVPNSSL]/+CSCO+00";; echo -n $b; echo -n "++";
echo "";
V. BUSINESS IMPACT
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Users with valid account can surf to internal/external resources,
bypassing controls in home page.
VI. SYSTEMS AFFECTED
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Cisco ASA <= 8.x are vulnerable.
VII. SOLUTION
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Always set "webtype" ACL and "filter" to block access in Web VPN SSL
(not activated by default). Included in Cisco site now.
Follow recommendations from "Cisco Understanding Features Not
Supported in Clientless SSL VPN" [3].
VIII. REFERENCES
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[1] www.cisco.com/web/go/sslvpn
[2] http://en.wikipedia.org/wiki/ROT13
[3] http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/
guide/webvpn.html#wp999589
http://tools.cisco.com/security/center/viewAlert.x?alertId=19609
http://www.isecauditors.com
IX. CREDITS
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This vulnerability has been discovered by
David Eduardo Acosta Rodríguez (deacosta (at) isecauditors (dot) com,
dacosta (at) computer (dot) org).
Thanks to Juan Galiana Lara (jgaliana (at) isecauditors (dot) com))
for additional research.
X. REVISION HISTORY
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December 7, 2009: Initial release.
December 16, 2009: Last revision.
XI. DISCLOSURE TIMELINE
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December 9, 2009: Vendor contacted
December 9, 2009: Vendor response, they include our mitigation
proposal in their website and start the analysis
of correction required.
December 16, 2009: Vendor confirms remediation and public statement.
December 17, 2009: Sent to lists.
XII. LEGAL NOTICES
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The information contained within this advisory is supplied "as-is"
with no warranties or guarantees of fitness of use or otherwise.
Internet Security Auditors accepts no responsibility for any damage
caused by the use or misuse of this information.
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