__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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__________________________________________________________
INFORMATION BULLETIN
Cisco PIX Multiple Vulnerabilities
[Cisco Security Advisory Revision 1.0]
November 21, 2002 01:00 GMT Number N-017
______________________________________________________________________________
PROBLEM: Two vulnerabilities exist in PIX Firewall. The first
vulnerability does not delete duplicate Internet Security
Authentication Key Management Protocol Security Associations
(ISAKMP SAs) with the peer. The second vulnerability has a
buffer overflow while doing HTTP traffic authentication.
PLATFORM: All PIX Firewall units running the vulnerable releases and
using the specific features are affected by these
vulnerabilities as specified in the Affected Products section
of Cisco's bulletin.
DAMAGE: The first vulnerability can be exploited to initiate a
Man-in-the-Middle attack for VPN sessions to the PIX. The
second vulnerability can be exploited to initiate a
Denial-of-Service attack.
SOLUTION: Upgrade to fixed releases as prescribed by Cisco's bulletin.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. In the first vulnerability an attacker must
ASSESSMENT: be able to block a logged-in user's connection and establish a
connection to the PIX using the same IP address as that of the
user. The second vulnerability may cause the PIX to crash, thus
causing a denial of service.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-017.shtml
ORIGINAL BULLETIN:
http://www.cisco.com/warp/public/707/
pix-multiple-vuln-pub.shtml
______________________________________________________________________________
[***** Start Cisco Security Advisory Revision 1.0 *****]
Cisco Security Advisory: Cisco PIX Multiple Vulnerabilities
Revision 1.0
For Public Release 2002 November 20 at 1600 UTC (GMT)
----------------------------------------------------------------------
Contents
Summary
Affected Products
Details
Impact
Software Versions and Fixes
Obtaining Fixed Software
Workarounds
Exploitation and Public Announcements
Status of This Notice
Distribution
Revision History
Cisco Security Procedures
----------------------------------------------------------------------
Summary
The Cisco PIX Firewall provides robust, enterprise-class security services
including stateful inspection firewalling, standards-based IP Security
(IPsec) Virtual Private Networking (VPN), intrusion protection and much
more in cost-effective, easy to deploy solutions.
Two vulnerabilities have been resolved for the PIX firewall for which
fixes are available. These vulnerabilities are documented as Cisco bug ID
CSCdv83490 and CSCdx35823. There are no workarounds available to mitigate
the effects of these vulnerabilities.
This advisory will be posted at
http://www.cisco.com/warp/public/707/pix-multiple-vuln-pub.shtml.
Affected Products
All PIX Firewall units running the vulnerable releases and using the
specific features are affected by these vulnerabilities.
No other Cisco products are currently known to be affected by these
vulnerabilities.
+-------------------------------------------------+
| DDTs-Description |Affected Release |
|-------------------------------+-----------------|
|CSCdv83490-While processing |6.0.3 and earlier|
|initial contact notify messages|6.1.3 and earlier|
|the PIX does not delete | |
|duplicate Internet Security | |
|Authentication Key Management | |
|Protocol Security Associations | |
|(ISAKMP SAs) with the peer. | |
|-------------------------------+-----------------|
|CSCdx35823-Buffer overflow |5.2.8 and earlier|
|while doing HTTP traffic |6.0.3 and earlier|
|authentication using Terminal |6.1.3 and earlier|
|Access Controller Access |6.2.1 and earlier|
|Control System Plus (TACACS+) | |
|or Remote Authentication | |
|Dial-In User Service (RADIUS). | |
+-------------------------------------------------+
To determine your software revision, type show version at the command line
prompt.
Details
CSCdv83490
When a user establishes a VPN session upon successful peer and
user authentication, the PIX creates an ISAKMP SA associating the
user and his IP address.
If an attacker is now able to block the logged-in user's
connection and establish a connection to the PIX using the same IP
address as that of the user, he will be able to establish a VPN
session with the PIX, using only peer authentication, provided he
already has access to the peer authentication key also known as
the group pre-shared key (PSK) or group password key.
CSCdx35823
A user starting a connection via FTP, Telnet, or over the World
Wide Web (HTTP) is prompted for their user name and password. If
the user name and password are verified by the designated TACACS+
or RADIUS authentication server, the PIX Firewall unit will allow
further traffic between the authentication server and the
connection to interact independently through the PIX Firewall
unit's "cut-through proxy" feature.
The PIX may crash and reload due to a buffer overflow
vulnerability while processing HTTP traffic requests for
authentication using TACACS+ or RADIUS.
The Internetworking Terms and Acronyms online guide can be found at
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ita/index.htm. The Cisco
Systems Terms and Acronyms online guide can be found at
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ita/cisco12.htm.
These vulnerabilities are documented in the Bug Toolkit as Bug IDs
CSCdv83490 and CSCdx35823, and can be viewed after 2002 November 21 at
1600 UTC. To access this tool, you must be a registered user and you must
be logged in.
Impact
+-------------------------------------------------+
| DDTs-Description | Impact |
|-------------------------+-----------------------|
|CSCdv83490-While |This vulnerability can |
|processing initial |be exploited to |
|contact notify messages |initiate a |
|the PIX does not delete |Man-In-The-Middle |
|duplicate ISAKMP SA's |attack for VPN sessions|
|with the peer. |to the PIX. |
|-------------------------+-----------------------|
|CSCdx35823 - Buffer |This vulnerability can |
|overflow while doing HTTP|be exploited to |
|traffic authentication |initiate a |
|using TACACS+ or RADIUS. |Denial-of-Service |
| |attack. |
+-------------------------------------------------+
Software Versions and Fixes
+-------------------------------------------------+
| DDTs-Description |Fixed Releases|
|----------------------------------+--------------|
|CSCdv83490-While processing |6.0.4 and |
|initial contact notify messages |later |
|the PIX does not delete duplicate |6.1.4 and |
|ISAKMP SAs with the peer. |later |
| |6.2.1 and |
| |later |
|----------------------------------+--------------|
|CSCdx35823-Buffer overflow while |5.2.9 and |
|doing HTTP traffic authentication |later |
|using TACACS+ or RADIUS. |6.0.4 and |
| |later |
| |6.1.4 and |
| |later |
| |6.2.2 and |
| |later |
+-------------------------------------------------+
The procedure to upgrade to the fixed software version is detailed at
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/index.htm.
Obtaining Fixed Software
Cisco is offering free software upgrades to address these vulnerabilities
for all affected customers. Customers may only install and expect support
for the feature sets they have purchased.
Customers with service contracts should contact their regular update
channels to obtain the free software upgrade identified via this advisory.
For most customers with service contracts, this means that upgrades should
be obtained through the Software Center on Cisco's worldwide website at
http://www.cisco.com/pcgi-bin/tablebuild.pl/pix. To access the software,
download URL http://www.cisco.com/pcgi-bin/tablebuild.pl/pix, you must be
a registered user and you must be logged in.
Customers whose Cisco products are provided or maintained through a prior
or existing agreement with third-party support organizations such as Cisco
Partners, authorized resellers, or service providers should contact that
support organization for assistance with obtaining the free software
upgrade(s).
Customers who purchased directly from Cisco but who do not hold a Cisco
service contract, and customers who purchase through third-party vendors
but are unsuccessful at obtaining fixed software through their point of
sale, should obtain fixed software by contacting the Cisco Technical
Assistance Center (TAC) using the contact information listed below. In
these cases, customers are entitled to obtain an upgrade to a later
version of the same release or as indicated by the applicable corrected
software version in the Software Versions and Fixes section (noted above).
Cisco 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
See http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for
additional TAC contact information, including special localized telephone
numbers and instructions and e-mail addresses for use in various
languages.
Please have your product serial number available and give the URL of this
advisory as evidence of your entitlement to a free upgrade.
Please do not contact either "psirt@cisco.com" or
"security-alert@cisco.com" for software upgrades.
Workarounds
There are no workarounds for these vulnerabilities. The Cisco PSIRT
recommends that affected users upgrade to a fixed software version of
code.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any malicious use of the vulnerabilities
described in this advisory.
These vulnerabilities were reported to PSIRT by Cisco engineering and
customers.
Status of This Advisory: FINAL
This is a final advisory. Although Cisco cannot guarantee the accuracy of
all statements in this advisory, all of the facts have been checked to the
best of our ability. Cisco does not anticipate issuing updated versions of
this advisory unless there is some material change in the facts. Should
there be a significant change in the facts, Cisco may update this
advisory.
A stand-alone copy or paraphrase of the text of this security advisory
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 will be posted on Cisco's worldwide website at
http://www.cisco.com/warp/public/707/pix-multiple-vuln-pub.shtml.
In addition to worldwide website posting, a text version of this advisory
is clear-signed with the Cisco PSIRT PGP key having the fingerprint FEB1
1B89 A64B 60BB 4770 D1CE 93D2 FF06 F236 759C and is posted to the
following e-mail and Usenet news recipients:
* cust-security-announce@cisco.com
* bugtraq@securityfocus.com
* full-disclosure@lists.netsys.com
* first-teams@first.org (includes CERT/CC)
* cisco-nsp@puck.nether.net
* cisco@spot.colorado.edu
* comp.dcom.sys.cisco
* Various internal Cisco mailing lists
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 | 2002-Nov-20 | Initial public release |
| 1.0 | | |
+-------------------------------------------------+
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/warp/public/707/sec_incident_response.shtml. This
includes instructions for press inquiries regarding Cisco security
advisories. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.
----------------------------------------------------------------------
This advisory is Copyright 2002 by Cisco Systems, Inc. This advisory may
be redistributed freely after the release date given at the top of the
text, provided that redistributed copies are complete and unmodified,
including all date and version information.
----------------------------------------------------------------------
[***** End Cisco Security Advisory Revision 1.0 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Cisco Systems, Inc. for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193 (7x24)
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@ciac.org
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
Anonymous FTP: ftp.ciac.org
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
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otherwise, does not necessarily constitute or imply its endorsement,
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