Cisco Security Advisory: SSL Implementation Vulnerabilities
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Cisco Security Advisory: SSL Implementation Vulnerabilities
Revision 1.0
For Public Release 2003 September 30 at 2330 GMT
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Contents
Summary
Affected Products
Details
Impact
Software Versions and Fixes
Obtaining Fixed Software
Workarounds
Exploitation and Public Announcements
Status of This Notice: INTERIM
Distribution
Revision History
Cisco Security Procedures
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Summary
New vulnerabilities in the OpenSSL implementation for SSL
have been announced.
An affected network device running an SSL server based on the OpenSSL
implementation may be vulnerable to a Denial of Service (DoS) attack when
presented with a malformed certificate by a client. The network device is
vulnerable to this vulnerability even if it is configured to not
authenticate certificates from the client. There are workarounds available
to mitigate the effects of these vulnerabilities.
This advisory will be posted at
http://www.cisco.com/warp/public/707/cisco-sa-20030930-ssl.shtml.
Affected Products
The following products have their SSL implementation based on the OpenSSL
code and may be affected by the OpenSSL vulnerabilities.
* Cisco IOS 12.1(11)E and later in the 12.1E release train
* Cisco PIX Firewall
* Cisco Firewall Services Module (FWSM) for the Cisco Catalyst 6500
Series and Cisco 7600 Series routers
* Cisco Network Analysis Modules (NAM) for the Cisco Catalyst 6000 and
6500 Series switches and Cisco 7600 Series routers
* Cisco Content Service Switch (CSS) 11000 series
* Cisco Global Site Selector (GSS) 4480
* Cisco Application & Content Networking Software (ACNS)
* Cisco SN 5428 Storage Router
* CiscoWorks 1105 Hosting Solution Engine (HSE)
* CiscoWorks 1105 Wireless LAN Solution Engine (WLSE)
* CiscoWorks Common Services (CMF)
* Cisco SIP Proxy Server (SPS)
The following products, which implement SSL, are currently known to be not
vulnerable to the OpenSSL vulnerabilities.
* Cisco VPN 3000 Series Concentrators
* Cisco Secure Intrusion Detection System (NetRanger) appliance. This
includes the IDS-42xx appliances, NM-CIDS and WS-SVS-IDSM2.
* Cisco Secure Socket Layer (SSL) Services Module for the Cisco Catalyst
6500 Series and Cisco 7600 Series routers
* Cisco Call Manager
No other Cisco products are currently known to be affected by these
vulnerabilities.
Details
An affected network device running an SSL server based on the OpenSSL
implementation may be vulnerable to a Denial of Service (DoS) attack when
presented with a malformed certificate by a client. The network device is
vulnerable to this vulnerability even if it is configured to not
authenticate certificates from the client.
More information on these OpenSSL vulnerabilities is available at
http://www.openssl.org/news/secadv_20030930.txt .
* Cisco IOS - All 12.1(11)E and later IOS software releases in the 12.1E
release train are affected by the OpenSSL vulnerabilities. The command
no ip http secureserver may be used to disable the HTTPS web service
on the device.
* Cisco PIX Firewall - This vulnerability is documented as Bug ID
CSCec31274 .
* Cisco Firewall Services Module (FWSM) - This vulnerability is
documented as Bug ID CSCec45573 .
* Cisco Network Analysis Modules (NAM) - This vulnerability is
documented as Bug ID CSCec45573 .
* Cisco Content Service Switch (CSS) 11000 series - Cisco WebNS versions
6.x and 7.x are vulnerable. WebNS version 5.x is not vulnerable to the
OpenSSL vulnerabilities. This vulnerability is documented as Bug IDs
CSCec45165 and CSCec45342 .
* Cisco Global Site Selector (GSS) 4480 - This vulnerability is
documented as Bug ID CSCec45380 .
* Cisco Application & Content Networking Software (ACNS) - This
vulnerability is documented as Bug ID CSCec41413 .
* Cisco SN 5428 Storage Router - This vulnerability is documented as Bug
ID CSCec44103 .
* CiscoWorks 1105 Hosting Solution Engine (HSE) - This vulnerability is
documented as Bug ID CSCec38542 .
* CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) - This
vulnerability is documented as Bug ID CSCec38526 .
* CiscoWorks Common Services (CMF) - Both Solaris and Windows version of
CMF 2.2 and CMF 2.1 are vulnerable. Windows versions of Core 1.0 are
also vulnerable. This vulnerability is documented as Bug ID CSCec43722
* Cisco SIP Proxy Server (SPS) - This vulnerability is documented as Bug
ID CSCec31901 .
Impact
An affected network device running an SSL server based on the OpenSSL
implementation may be vulnerable to a Denial of Service (DoS) attack when
presented with a malformed certificate by a client regardless of whether
it is configured to process client certificates or not.
Software Versions and Fixes
* Cisco IOS - 12.1(14)E most likely would be the release to have this
fix. CCO availability TBD.
* Cisco PIX firewall - This vulnerability is fixed in software release
6.3(3.102). CCO availability TBD.
* Cisco Firewall Services Module (FWSM) - Fixed Software release TBD.
CCO availability TBD.
* Cisco Network Analysis Modules (NAM) - Fixed Software release TBD. CCO
availability TBD.
* Cisco Content Service Switch (CSS) 11000 series - Fixed Software
release TBD. CCO availability TBD.
* Cisco Global Site Selector (GSS) 4480 - Fixed Software release TBD.
CCO availability TBD.
* Cisco Application & Content Networking Software (ACNS) - Fixed
Software release 5.0.7. CCO availability September 30, 2003.
* Cisco SN 5428 Storage Router - Fixed Software version 3.4.2. CCO
availability TBD.
* CiscoWorks 1105 Hosting Solution Engine (HSE) - Fixed Software release
1.7.3. CCO availability November 21, 2003.
* CiscoWorks 1105 Wireless LAN Solution Engine (WLSE) - Fixed Software
release 2.5. CCO availability TBD.
* CiscoWorks Common Services (CMF) - Fixed Software release TBD. CCO
availability TBD.
* Cisco SIP Proxy Server (SPS) - Fixed Software release 2.2. CCO
availability TBD.
Obtaining Fixed Software
Cisco is offering free software upgrades or patches to address these
vulnerabilities for all affected customers. Customers may only install and
expect support for the feature sets they have purchased. By installing,
downloading, accessing or otherwise using such software upgrades or
patches, Customers agree to be bound by the terms of Cisco's software
license terms found at
http://www.cisco.com/public/sw-license-agreement.html, or as otherwise set
forth at the Cisco Connection Online Software Center at
http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
Customers with service contracts should contact their regular update
channels to obtain the free software upgrade(s) or patches 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/tacpage/sw-center/. To access
the software download URL, 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).
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@xxxxxxxxx
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
notice as evidence of your entitlement to a free upgrade.
Please do not contact either "psirt@xxxxxxxxx" or
"security-alert@xxxxxxxxx" for software upgrades.
Workarounds
The Cisco PSIRT recommends that affected users upgrade to a fixed software
version of code as soon as it is available.
* Restrict access to the HTTPS server on the network device: Allow
access to the network device only from trusted workstations by using
ACL's / MAC filters that are available on the affected platforms.
* Disable the SSL server / service on the network device. This
workaround must be weighed against the need for secure communications
with the vulnerable device.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any malicious use of the vulnerabilities
described in this advisory at this time.
These vulnerabilities have also been documented by the NISCC at
http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm .
Status of This Notice: INTERIM
This is a interim 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/cisco-sa-20030930-ssl.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 8C82
5207 0CA9 ED40 1DD2 EE2A 7B31 A8CF 32B6 B590 and is posted to the
following e-mail and Usenet news recipients.
* cust-security-announce@xxxxxxxxx
* first-teams@xxxxxxxxx (includes CERT/CC)
* bugtraq@xxxxxxxxxxxxxxxxx
* vulnwatch@xxxxxxxxxxxxx
* cisco@xxxxxxxxxxxxxxxxx
* cisco-nsp@xxxxxxxxxxxxxxx
* full-disclosure@xxxxxxxxxxxxxxxx
* 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
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|Revision 1.0|2003-30-Sept|Initial public |
| | |release. |
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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
notices. All Cisco security advisories are available at
http://www.cisco.com/go/psirt.
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This notice is Copyright 2003 by Cisco Systems, Inc. This notice may be
redistributed freely after the release date given at the top of the text,
provided that redistributed copies are complete and unmodified, and
include all date and version information.
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