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Cisco Security Advisory

Cisco ONS15454, ONS15327, ONS15454SDH, and ONS15600 Nessus Vulnerabilities

Advisory ID: cisco-sa-20030501-ons

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20030501-ons

Revision 2.0

For Public Release 2003 May 1 16:00  UTC (GMT)


Summary

Nessus exposes FTP and Telnet vulnerabilities in the Cisco ONS15454 Optical Transport Platform, the Cisco ONS15327 Edge Optical Transport Platform, the Cisco ONS15454SDH Multiplexer Platform, and the Cisco ONS15600 Multiservice Switching Platform. Cisco ONS15454 hardware running ONS Releases 3.0 through Release 3.4.1, Cisco ONS15327 and ONS15454SDH hardware running ONS Releases 3.3 through Release 3.4.1, and Cisco ONS15600 hardware running ONS Release 1.0 is affected by these vulnerabilities. Nessus is a free security scanner software available from nessus.org.

These vulnerabilities are documented as Cisco Bug IDs CSCdz83515, CSCdz83519, and CSCdz48556. There are workarounds available to mitigate the effects of these vulnerabilities.

This advisory will be posted at: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20030501-ons

Affected Products

Vulnerable Products

The following products are known to be vulnerable to this issue:
  • Cisco ONS15454 hardware running ONS Releases 3.0 through Release 3.4.1
  • Cisco ONS15327 and Cisco ONS15454SDH hardware running ONS Releases 3.3 through Release 3.4.1
  • Cisco ONS15600 hardware running ONS Release 1.0
To determine your software revision, view the Help > About window on the CTC network management software.

Products Confirmed Not Vulnerable

The following products are not affected by the issue documented in this advisory:
  • Cisco ONS15454 hardware running ONS Releases 4.0 and 2.x
  • Cisco ONS15327 hardware running ONS Release 4.0 and Release 1.x
  • Cisco ONS15454SDH hardware running ONS Release 4.0

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

Details

The affected Cisco ONS15454, ONS15327, ONS15454SDH, and ONS15600 hardware is managed via the TCC+, XTC, TCCi, 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.

DDTS - Description

Details

CSCdz83515 - TCC+ reboots on Nessus VxWorks FTP DoS script

By making an invalid FTP request, a person may cause the TCC+, XTC, TCCi, or TSC control cards to reset. Repeated invalid requests would cause both the control cards to be reset at the same time.

CSCdz83519 - TCC+ reboots on Nessus VxWorks binlogin overflow script

By making an invalid Telnet request, a person may cause the TCC+, XTC, TCCi, or TSC control cards to reset. Repeated invalid requests would cause both the control cards to be reset at the same time.

CSCdz48556 - TCC+ reboots due to FTP server input buffer overflow vulnerability

By making an invalid FTP request, a person may cause the TCC+, XTC, TCCi, or TSC control cards to reset. Repeated invalid requests would cause both the control cards to be reset at the same time.

These vulnerabilities are documented as Bug IDs CSCdz83515, CSCdz83519, and CSCdz48556. Details can be viewed after 2003 May 02 by accessing the Cisco Bug Toolkit ( registered customers only) .

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

Vulnerability Scoring Details

Cisco has not provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS).  At the time of original publication, CVSS scoring in Cisco security publications was not yet adopted.

Impact

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

On the Cisco ONS15454, ONS15327, and ONS15454SDH hardware platforms, 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 via the TCC+, XTC, and TCCi control cards are not available until the control card reboots.

On the Cisco ONS15600 hardware platforms, 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 via the TSC control cards are not available until the control card reboots.

Software Versions and Fixes

All these vulnerabilities for the ONS15454, ONS15327, and ONS15454SDH platforms are fixed in the Cisco ONS software Releases 4.0 and later for the affected platforms.

All these vulnerabilities for the ONS15600 platforms are fixed in the Cisco ONS software Release 1.1, which will be available in September 2003.

Upgrade procedures can be found as indicated below.


Workarounds

The Cisco PSIRT recommends that affected users upgrade to a fixed software version of code as soon as possible.

Use Unicast Reverse Path Forwarding and access control lists on routers and firewalls to allow only valid network management workstations gain FTP and Telnet access to the TCC+, XTC, TCCi, or TSC control cards.

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

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/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml .

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades

Customers with Service Contracts

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

Customers Using Third-Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire 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

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

Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

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 reported to PSIRT by internal development testing and customers.

Status of This Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document 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 is posted on Cisco's worldwide website at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20030501-ons

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • cust-security-announce@cisco.com
  • first-teams@first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • 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 2.0

2003-May-28

Added CSCdz48556. Another vulnerability resolved by the fixed software listed in the advisory.

Revision 1.0

2003-May-01

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/web/about/security/psirt/security_vulnerability_policy.html. 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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