[NEWS] Cisco PIX Multiple Vulnerabilities
From: support@securiteam.com
Date: 11/21/02
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From: support@securiteam.com To: list@securiteam.com Date: 21 Nov 2002 11:27:49 +0200
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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Cisco PIX Multiple Vulnerabilities
------------------------------------------------------------------------
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.
DETAILS
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:
CSCdv83490 - While processing initial contact notify messages the PIX does
not delete duplicate Internet Security Authentication Key Management
Protocol Security Associations (ISAKMP SAs) with the peer.
Affected Release:
* 6.0.3 and earlier
* 6.1.3 and earlier
DDTs - Description:
CSCdx35823 - Buffer overflow while doing HTTP traffic authentication using
Terminal Access Controller Access Control System Plus (TACACS+) or Remote
Authentication Dial-In User Service (RADIUS).
Affected Release:
* 5.2.8 and earlier
* 6.0.3 and earlier
* 6.1.3 and earlier
* 6.2.1 and earlier
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>
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>
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:
CSCdv83490 - While processing initial contact notify messages the PIX does
not delete duplicate ISAKMP SA's with the peer.
Impact:
This vulnerability can be exploited to initiate a Man-In-The-Middle attack
for VPN sessions to the PIX.
DDTs - Description
CSCdx35823 - Buffer overflow while doing HTTP traffic authentication using
TACACS+ or RADIUS.
Impact:
This vulnerability can be exploited to initiate a Denial-of-Service
attack.
Software Versions and Fixes:
DDTs - Description:
CSCdv83490 - While processing initial contact notify messages the PIX does
not delete duplicate ISAKMP SAs with the peer.
Fixed Releases:
* 6.0.4 and later
* 6.1.4 and later
* 6.2.1 and later
DDTs - Description:
CSCdx35823 - Buffer overflow while doing HTTP traffic authentication using
TACACS+ or RADIUS.
Fixed Releases:
* 5.2.9 and later
* 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> 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.
To access the software download URL
<http://www.cisco.com/pcgi-bin/tablebuild.pl/pix>
http://www.cisco.com/pcgi-bin/tablebuild.pl/pix, you must be a registered
user and you must be logged in. 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/cgi-bin/tablebuild.pl/pix>
http://www.cisco.com/cgi-bin/tablebuild.pl/pix.
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>
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.
ADDITIONAL INFORMATION
The original advisory can be viewed by going to:
<http://www.cisco.com/warp/public/707/pix-multiple-vuln-pub.shtml>
http://www.cisco.com/warp/public/707/pix-multiple-vuln-pub.shtml.
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