[nsp] Cisco Security Advisory: Cisco ONS 15327, ONS 15454,
ONS 15454 SDH, and ONS 15600 Malformed Packet Vulnerabilities
Cisco Systems Product Security Incident Response Team
psirt at cisco.com
Wed Jul 21 12:20:08 EDT 2004
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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 at 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 at cisco.com" or
"security-alert at 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 at cisco.com
* first-teams at first.org (includes CERT/CC)
* bugtraq at securityfocus.com
* vulnwatch at wulnwatch.org
* cisco at spot.colorado.edu
* cisco-nsp at puck.nether.net
* full-disclosure at lists.netsys.com
* comp.dcom.sys.cisco at 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 at cisco.com, Cisco Systems PSIRT
iD8DBQFA/pUyezGozzK2tZARAnORAJ9FigOzqVPxgwzK050tY6kb5Bb8BQCfVMOD
I/fYouemtiYqxSFUeOWIzF0-----END PGP SIGNATURE-----
More information about the cisco-nsp
mailing list