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Cisco Security Advisory: Cisco ONS 15327, ONS 15454, ONS 15454 SDH, and ONS 15600 Malformed Packet Vulnerabilities
From: Cisco Systems Product Security Incident Response Team <psirt () cisco com>
Date: Wed, 21 Jul 2004 9:20:8 -0700

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  Cisco Security Advisory: Cisco ONS 15327, ONS 15454, ONS 15454 SDH, and ONS
                     15600 Malformed Packet Vulnerabilities

Revision 1.0

  For Public Release 2004 July 21 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: FINAL
     Distribution
     Revision History
     Cisco Security Procedures

     ----------------------------------------------------------------------

Summary

   Cisco has fixed multiple malformed packet vulnerabilities in the TCP/IP
   stacks of Cisco ONS 15327 Edge Optical Transport Platform, the Cisco ONS
   15454 Optical Transport Platform, the Cisco ONS 15454 SDH Multiplexer
   Platform, and the Cisco ONS 15600 Multiservice Switching Platform.

   These vulnerabilities are documented as the following Cisco bug IDs

     * CSCed06531 (IP)
     * CSCed86946 (ICMP)
     * CSCec88426/CSCec88508/CSCed85088/CSCeb07263/CSCec21429 (TCP)
     * CSCec59739/CSCed02439/CSCed22547 (Last-ACK)
     * CSCec88402/CSCed31918/CSCed83309/CSCec85982/CSCec21435/CSCee03697
       (UDP)
     * CSCea16455/CSCea37089/CSCea37185 (SNMP)
     * CSCee27329 (passwd)

   There are workarounds available to mitigate the exposure to these
   vulnerabilities in the workaround section of this advisory. Cisco is
   providing fixed software, and recommends that customers upgrade to it.

   This advisory will be posted at
   http://www.cisco.com/warp/public/707/cisco-sa-20040721-ons.shtml.

Affected Products

  Vulnerable Products

     * CSCed06531 (IP)

       +----------------------------------------+
       |     Product      |  Affected Releases  |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |15327             |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x) and earlier   |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |                  |4.5(x)               |
       |15454, 15454 SDH  |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x)               |
       |                  |earlier than 2.3(5)  |
       |------------------+---------------------|
       |15600             |Not Affected         |
       +----------------------------------------+

     * CSCed86946 (ICMP)

       +----------------------------------------+
       |     Product      |  Affected Releases  |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |15327             |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x) and earlier   |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |                  |4.5(x)               |
       |15454, 15454 SDH  |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x)               |
       |                  |earlier than 2.3(5)  |
       |------------------+---------------------|
       |15600             |Not Affected         |
       +----------------------------------------+

     * CSCec88426/CSCec88508/CSCed85088/CSCeb07263/CSCec21429 (TCP)

       +----------------------------------------+
       |     Product      |  Affected Releases  |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |15327             |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x) and earlier   |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |                  |4.5(x)               |
       |15454, 15454 SDH  |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x)               |
       |                  |earlier than 2.3(5)  |
       |------------------+---------------------|
       |15600             |1.x(x)               |
       +----------------------------------------+

     * CSCec59739/CSCed02439/CSCed22547 (Last-ACK)

       +----------------------------------------+
       |     Product      |  Affected Releases  |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |15327             |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x) and earlier   |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |                  |4.5(x)               |
       |15454, 15454 SDH  |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x)               |
       |                  |earlier than 2.3(5)  |
       |------------------+---------------------|
       |15600             |Not Affected         |
       +----------------------------------------+

     * CSCec88402/CSCed31918/CSCed83309/CSCec85982/CSCec21435/CSCee03697
       (UDP)

       +----------------------------------------+
       |     Product      |  Affected Releases  |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |15327             |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x) and earlier   |
       |------------------+---------------------|
       |                  |4.6(0) and 4.6(1)    |
       |                  |4.5(x)               |
       |15454, 15454 SDH  |4.1(0) to 4.1(3)     |
       |                  |4.0(0) to 4.0(2)     |
       |                  |3.x(x)               |
       |                  |earlier than 2.3(5)  |
       |------------------+---------------------|
       |15600             |1.x(x)               |
       +----------------------------------------+

     * CSCea16455/CSCea37089/CSCea37185 (SNMP)

       +----------------------------------------+
       |     Product      |  Affected Releases  |
       |------------------+---------------------|
       |                  |4.1(0) to 4.1(2)     |
       |15327             |4.0(0) to 4.0(2)     |
       |                  |3.x(x) and earlier   |
       |------------------+---------------------|
       |                  |4.5(x)               |
       |                  |4.1(0) to 4.1(2)     |
       |15454, 15454 SDH  |4.0(0) to 4.0(2)     |
       |                  |3.x(x)               |
       |                  |earlier than 2.3(5)  |
       |------------------+---------------------|
       |15600             |Not Affected         |
       +----------------------------------------+

     * CSCee27329 (passwd)

       +----------------------------------------+
       |      Product      | Affected Releases  |
       |-------------------+--------------------|
       |15327              |4.6(0) and 4.6(1)   |
       |-------------------+--------------------|
       |15454, 15454 SDH   |4.6(0) and 4.6(1)   |
       |-------------------+--------------------|
       |15600              |Not Affected        |
       +----------------------------------------+

  Products Confirmed Not Vulnerable

   For clarification, the following products are not affected by these
   vulnerabilities.

     * Cisco ONS 15800 series
     * ONS 15500 series extended service platform
     * ONS 15302, ONS 15305, ONS 15200 series metro DWDM systems
     * ONS 15190 series IP transport concentrator

   No other Cisco products are currently known to be affected by these
   vulnerabilities.

   To determine your software revision, view the Help > About window on the
   CTC management software.

Details

   The affected Cisco ONS 15327, ONS 15454, ONS 15454 SDH, and ONS 15600
   hardware is managed through the XTC, TCC/TCC+/TCC2, TCCi/TCC2, and TSC
   control cards respectively. These control cards are usually connected to a
   network isolated from the Internet and local to the customer's
   environment. This limits the exposure to the exploitation of the
   vulnerabilities from the Internet.

     * CSCed06531 (IP)
       Malformed IP packets may potentially cause the XTC, TCC/TCC+/TCC2 and
       TCCi/TCC2 control cards to reset. Repeated transmission of these
       malformed packets could cause both the control cards to be resetting
       at the same time.
       The Cisco ONS 15600 hardware is not affected by this issue.
     * CSCed86946 (ICMP)
       Malformed ICMP packets may potentially cause the XTC, TCC/TCC+/TCC2
       and TCCi/TCC2 control cards to reset. Repeated transmission of these
       malformed packets could cause both the control cards to be resetting
       at the same time.
       The Cisco ONS 15600 hardware is not affected by this issue.
     * CSCec88426/CSCec88508/CSCed85088/CSCeb07263/CSCec21429 (TCP)
       Malformed TCP packets may potentially cause the XTC, TCC/TCC+/TCC2,
       TCCi/TCC2 and TSC control cards to reset. Repeated transmission of
       these malformed packets could cause both the control cards to be
       resetting at the same time.
       Cisco bug IDs CSCec88426, CSCec88508, and CSCed85088 document the
       issue on the Cisco ONS 15327, ONS 15454 and ONS 15454 SDH, and Cisco
       bug IDs CSCeb07263 and CSCec21429 documents the issue on the Cisco ONS
       15600 hardware.
       There is no traffic impact on the Cisco ONS 15600 hardware; only
       manageability functions are affected because of this issue.
     * CSCec59739/CSCed02439/CSCed22547 (Last-ACK)
       The XTC, TCC/TCC+/TCC2 and TCCi/TCC2 control cards are susceptible to
       a TCP-ACK Denial of Service (DoS) attack on open TCP ports. The
       controller card on the optical device will reset under such an attack.
       A TCP-ACK DoS attack is conducted by not sending the regular final ACK
       required for a 3-way TCP handshake to complete, and instead sending an
       invalid response to move the connection to an invalid TCP state.
       The Cisco ONS 15600 hardware is not affected by this issue.
     * CSCec88402/CSCed31918/CSCed83309/CSCec85982/CSCec21435/CSCee03697
       (UDP)
       Malformed UDP packets may potentially cause the XTC, TCC/TCC+/TCC2,
       TCCi/TCC2 and TSC control cards to reset. Repeated transmission of
       these malformed packets could cause both the control cards to be
       resetting at the same time.
       Cisco bug IDs CSCec88402, CSCed31918, CSCed83309, and CSCec85982
       document the issue on the Cisco ONS 15327, ONS 15454 and ONS 15454
       SDH, and Cisco bug ID CSCec21435 and CSCee03697 document the issue on
       the Cisco ONS 15600 hardware.
       There is no traffic impact on the Cisco ONS 15600 hardware; only
       manageability functions are affected because of this issue.
     * CSCea16455/CSCea37089/CSCea37185 (SNMP)
       Malformed SNMP packets may potentially cause the XTC, TCC/TCC+/TCC2
       and TCCi/TCC2 control cards to reset. Repeated transmission of these
       malformed packets could cause both the control cards to be resetting
       at the same time.
       The Cisco ONS 15600 hardware is not affected by this issue.
     * CSCee27329 (passwd)
       If an account has a blank password set, and an attempt was made to log
       into the device with a password greater than ten characters the
       attempt would be successful.
       This vulnerability only affects the TL1 login interface. The CTC login
       interface is not vulnerable to this vulnerability.
       The CTC and TL1 user interfaces prevent the setting of a blank
       password as the password. Only the CISCO15 userid, during initial
       install process has a blank password which is to be changed as part of
       the initial install process.
       The Cisco ONS 15600 hardware is not affected by this issue.

   The Internetworking Terms and Cisco Systems Acronyms online guides can be
   found at http://www.cisco.com/univercd/cc/td/doc/cisintwk/.

   These vulnerabilities are documented in the Cisco Bug Toolkit as Bug IDs

   CSCed06531 (IP),
   CSCed86946 (ICMP),
   CSCec88426/ CSCec88508/ CSCed85088/ CSCeb07263/ CSCec21429 (TCP),
   CSCec59739/ CSCed02439/ CSCed22547 (Last-ACK),
   CSCec88402/ CSCed31918/ CSCed83309/ CSCec85982/ CSCec21435/ CSCee03697
   (UDP),
   CSCea16455/ CSCea37089/ CSCea37185 (SNMP), and
   CSCee27329 (passwd) (registered customers only) .

Impact

   The malformed packet vulnerabilities could be exploited to launch a DoS
   attack on the optical device.

   The timing for the data channels traversing the switch is provided by the
   control cards.

   On the Cisco ONS 15454, ONS 15327, and ONS 15454 SDH hardware, whenever
   both the active and standby control cards are rebooting at the same time,
   the synchronous data channels traversing the switch drop traffic until the
   card reboots. Asynchronous data channels traversing the switch are not
   impacted. Manageability functions provided by the network element using
   the TCC+/TCC2, XTC, and TCCi/TCC2 control cards are not available until
   the control card reboots.

   On the Cisco ONS 15600 hardware, whenever both the active and standby
   control cards are rebooting at the same time, there is no impact to the
   data channels traversing the switch because the TSC does a software reset
   which does not impact the timing being provided by the TSC for the data
   channels.

   Manageability functions provided by the network element through the TSC
   control cards are not available until the control card reboots.

   The CSCee27329 (passwd) vulnerability could be exploited to gain
   unauthorized access to an account with a blank password set.

Software Versions and Fixes

   First fixed software release table for all vulnerabilities referenced in
   this Security Advisory

   +------------------------------------------+
   |       Product       |   Fixed Releases   |
   |---------------------+--------------------|
   |                     |4.6(2) and later    |
   |                     |                    |
   |15327                |4.1(4) and later    |
   |                     |                    |
   |                     |4.0(3) and later    |
   |---------------------+--------------------|
   |                     |4.6(2) and later    |
   |                     |                    |
   |                     |4.1(4) and later    |
   |15454, 15454 SDH     |                    |
   |                     |4.0(3) and later    |
   |                     |                    |
   |                     |2.3(5)              |
   |---------------------+--------------------|
   |15600                |5.0 and later       |
   +------------------------------------------+

     * CSCed06531 (IP)

       +----------------------------------------+
       |      Product       |  Fixed Releases   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15327               |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15454, 15454 SDH    |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |                    |2.3(5)             |
       |--------------------+-------------------|
       |15600               |Not Affected       |
       +----------------------------------------+

     * CSCed86946 (ICMP)

       +----------------------------------------+
       |      Product       |  Fixed Releases   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15327               |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15454, 15454 SDH    |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |                    |2.3(5)             |
       |--------------------+-------------------|
       |15600               |Not Affected       |
       +----------------------------------------+

     * CSCec88426/CSCec88508/CSCed85088/CSCeb07263/CSCec21429 (TCP)

       +----------------------------------------+
       |      Product       |  Fixed Releases   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15327               |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15454, 15454 SDH    |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |                    |2.3(5)             |
       |--------------------+-------------------|
       |15600               |5.0 and later      |
       +----------------------------------------+

     * CSCec59739/CSCed02439/CSCed22547 (Last-ACK)

       +----------------------------------------+
       |      Product       |  Fixed Releases   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15327               |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15454, 15454 SDH    |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |                    |2.3(5)             |
       |--------------------+-------------------|
       |15600               |Not Affected       |
       +----------------------------------------+

     * CSCec88402/CSCed31918/CSCed83309/CSCec85982/CSCec21435/CSCee03697
       (UDP)

       +----------------------------------------+
       |      Product       |  Fixed Releases   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15327               |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |--------------------+-------------------|
       |                    |4.6(2) and later   |
       |15454, 15454 SDH    |4.1(4) and later   |
       |                    |4.0(3) and later   |
       |                    |2.3(5)             |
       |--------------------+-------------------|
       |15600               |5.0 and later      |
       +----------------------------------------+

     * CSCea16455/CSCea37089/CSCea37185 (SNMP)

       +----------------------------------------+
       |      Product       |  Fixed Releases   |
       |--------------------+-------------------|
       |15327               |4.1(3) and later   |
       |                    |4.0(3) and later   |
       |--------------------+-------------------|
       |                    |4.6(0) and later   |
       |15454, 15454 SDH    |4.1(3) and later   |
       |                    |4.0(3) and later   |
       |                    |2.3(5)             |
       |--------------------+-------------------|
       |15600               |Not Affected       |
       +----------------------------------------+

     * CSCee27329 (passwd)

       +----------------------------------------+
       |      Product       |  Fixed Releases   |
       |--------------------+-------------------|
       |15327               |4.6(2) and later   |
       |--------------------+-------------------|
       |15454, 15454 SDH    |4.6(2) and later   |
       |--------------------+-------------------|
       |15600               |Not Affected       |
       +----------------------------------------+

   The vulnerabilities for the Cisco ONS 15600 platforms are fixed in the
   Cisco ONS software Release 5.0, which will be available in September 2004.

   Upgrade procedures can be found as indicated below:

   The procedure to upgrade to the fixed software version on the Cisco ONS
   15327 hardware is detailed at
   http://www.cisco.com/univercd/cc/td/doc/product/ong/15327/327doc41/index.htm.

   The procedure to upgrade to the fixed software version on the Cisco ONS
   15454 hardware is detailed at
   http://www.cisco.com/univercd/cc/td/doc/product/ong/15400/r46docs/index.htm
   .

   The procedure to upgrade to the fixed software version on the Cisco ONS
   15600 hardware is detailed at
   http://cisco.com/univercd/cc/td/doc/product/ong/15600/index.htm.

Obtaining Fixed Software

   Cisco is offering free software upgrades to address these vulnerabilities
   for all affected customers.

  Customers with Service Contracts

   Customers with contracts should obtain upgraded software through their
   regular update channels. For most customers, this means that the software
   upgrades should be obtained through the Software Center on Cisco's
   worldwide website at
   http://www.cisco.com/tacpage//sw-center/sw-optical.shtml.

  Customers using Third-party Support Organizations

   Customers whose Cisco products are provided or maintained through 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 the upgrade, which should be free
   of charge.

  Customers without Service Contracts

   Customers who purchase direct 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 get their 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

   Please have your product serial number available and give the URL of this
   notice as evidence of your entitlement to a free software upgrade. Free
   upgrades for non-contract customers must be requested through the TAC.

   Please do not contact either "psirt () cisco com" or
   "security-alert () cisco com" for software upgrades.

   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.

   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/public/sw-license-agreement.html, or as otherwise set
   forth at Cisco.com Downloads at
   http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Workarounds

   Apply ACLs (access control lists) on routers / switches / firewalls
   installed in front of the vulnerable network devices such that TCP/IP
   traffic destined for the XTC, TCC/TCC+/TCC2, TCCi/TCC2, or TSC control
   cards on the switches is only allowed from the network management
   workstations. Refer to http://www.cisco.com/warp/public/707/tacl.html for
   examples on how to apply access control lists (ACLs) on Cisco routers.

   Please note, these workarounds will not prevent spoofed IP packets with
   the source IP address set to that of the network management station from
   reaching the switch's management interface. For more information on
   anti-spoofing refer to http://www.cisco.com/warp/public/707/21.html#sec_ip
   and http://www.ietf.org/rfc/rfc2827.txt. The Unicast Reverse Path
   Forwarding (Unicast RPF) feature helps to mitigate problems that are
   caused by malformed or forged IP source addresses that are passing through
   a router, refer to
   http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fsecur_c/fothersf/scfrpf.htm
   .

   For the CSCee27329 (passwd) vulnerability ensure that there are no blank
   passwords set in the user database. Ensure that the CISCO15 userid has a
   strong password set.

   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 public announcements or malicious use
   of the vulnerabilities described in this advisory.

   These vulnerabilities were uncovered during Internal stress testing by
   Cisco except for the malformed ICMP packet vulnerability, which was
   reported to Cisco by a customer.

Status of This Notice: FINAL

   This Advisory is provided on an "as is" basis and does not imply any kind
   of guarantee or warranty of any kind. Your use of the information on the
   Advisory or materials linked from the Advisory is at your own risk. Cisco
   reserves the right to change or update this notice at anytime.

   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-20040721-ons.shtml .

   In addition to worldwide web posting, a text version of this notice 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 () wulnwatch org
     * cisco () spot colorado edu
     * cisco-nsp () puck nether net
     * full-disclosure () lists netsys com
     * 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|2004-July-21|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/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.

     ----------------------------------------------------------------------

   All contents are Copyright (c) 1992-2004 Cisco Systems, Inc. All rights
   reserved. Important Notices and Privacy Statement.

   --------------------------------------------------------------------------
-----BEGIN PGP SIGNATURE-----
Comment: Sharad Ahlawat, sha () cisco com, Cisco Systems PSIRT

iD8DBQFA/pUyezGozzK2tZARAnORAJ9FigOzqVPxgwzK050tY6kb5Bb8BQCfVMOD
I/fYouemtiYqxSFUeOWIzF0-----END PGP SIGNATURE-----

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