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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@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

notice 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



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@cisco.com



* first-teams@first.org (includes CERT/CC)



* bugtraq@securityfocus.com



* vulnwatch@vulnwatch.org



* cisco@spot.colorado.edu



* cisco-nsp@puck.nether.net



* full-disclosure@lists.netsys.com



* 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 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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