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Cisco Security Advisory

Multiple Vulnerabilities in Cisco Firewall Services Module Software

Advisory ID: cisco-sa-20131009-fwsm

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131009-fwsm

Revision 1.0

For Public Release 2013 October 9 16:00  UTC (GMT)


Summary

Cisco Firewall Services Module (FWSM) Software for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is affected by the following vulnerabilities:

  • Cisco FWSM Command Authorization Vulnerability
  • SQL*Net Inspection Engine Denial of Service Vulnerability
These vulnerabilities are independent of each other; a release that is affected by one of the vulnerabilities may not be affected by the other.

Successful exploitation of the Cisco FWSM Command Authorization Vulnerability may result in a complete compromise of the confidentiality, integrity and availability of the affected system. Successful exploitation of the SQL*Net Inspection Engine Denial of Service Vulnerability may result in a reload of an affected device, leading to a denial of service (DoS) condition.

Cisco has released free software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available.

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131009-fwsm

Note: The Cisco Adaptive Security Appliance (ASA) may be affected by the SQL*Net Inspection Engine Denial of Service Vulnerability. A separate Cisco Security Advisory has been published to disclose the vulnerabilities that affect the Cisco ASA. That advisory is available at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131009-asa

Affected Products

Cisco FWSM Software for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers is affected by two vulnerabilities. Affected releases of Cisco FWSM Software will vary depending on the specific vulnerability. Consult the "Software Versions and Fixes" section of this security advisory for more information about the affected releases.

Cisco FWSM has reached the end of software maintenance releases milestone. Cisco FWSM customers are encouraged to contact their Cisco representative for available replacement.

Vulnerable Products

Cisco FWSM Command Authorization Vulnerability

This vulnerability affects default configuration of Cisco FWSM Software configured in multiple context mode. To determine whether the Cisco FWSM Software is running in multiple context mode use the show mode command. The following example shows Cisco FWSM Software running in multiple context mode:
ciscofwsm# show mode
Security context mode: multiple
Note: Multiple context mode is not enabled by default. However, when it is enabled and at least one user context is configured, the system is vulnerable. Cisco FWSM Software releases prior to 3.1(8) and 3.2(4) are not affected by this vulnerability.


SQL*Net Inspection Engine Denial of Service Vulnerability

Cisco FWSM Software is affected by this vulnerability if SQL*Net inspection is enabled. To determine whether SQL*Net inspection is enabled use the show service-policy | include sqlnet command. The following example shows Cisco FWSM Software with SQL*Net inspection enabled:
ciscofwsm# show  service-policy | include sqlnet
 Inspect: Inspect: sqlnet, packet 0, drop 0, reset-drop 0
Note: SQL*Net inspection is enabled by default.

Determine the Running Software Version

To determine the version of the Cisco FWSM software that is running on a device, administrators can issue the show version command, as shown in the following example:
FWSM> show version

FWSM Firewall Version 4.0(16)
[...]
Customers who use the Cisco Adaptive Security Device Manager (ASDM) to manage their devices can find the version of the software displayed in the table in the login window or in the upper left corner of the Cisco ASDM window. The version notation is similar to the following example:
FWSM Version: 4.0(16)
Version information can also be obtained from the Cisco Catalyst 6500 Series Switch or the Cisco 7600 Series Router.  To determine the version of Cisco FWSM Software that is running on a device, issue the show module command from Cisco IOS Software or Cisco Catalyst Operating System Software to identify what modules and submodules are installed on the system.

The following example shows a system with a Cisco FWSM (WS-SVC-FWM-1) installed in slot 2:
switch>show module
Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  1   16  SFM-capable 16 port 1000mb GBIC        WS-X6516-GBIC      SAL06334NS9
  2    6  Firewall Module                        WS-SVC-FWM-1       SAD10360485
  3    8  Intrusion Detection System             WS-SVC-IDSM-2      SAD0932089Z
  4    4  SLB Application Processor Complex      WS-X6066-SLB-APC   SAD093004BD
  5    2  Supervisor Engine 720 (Active)         WS-SUP720-3B       SAL0934888E

Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  1  0009.11e3.ade8 to 0009.11e3.adf7   5.1   6.3(1)       8.7(0.22)BUB Ok
  2  0018.ba41.5092 to 0018.ba41.5099   4.0   7.2(1)       4.0(16)      Ok
  3  0014.a90c.9956 to 0014.a90c.995d   5.0   7.2(1)       7.0(4)E4     Ok
  4  0014.a90c.66e6 to 0014.a90c.66ed   1.7   Unknown      Unknown      PwrDown
  5  0013.c42e.7fe0 to 0013.c42e.7fe3   4.4   8.1(3)       12.2(33)SXH8 Ok

[...]
After locating the correct slot, issue the show module <slot number> command to identify the software version that is running, as shown in the following example:
switch>show module 2
Mod Ports Card Type                              Model              Serial No.
--- ----- -------------------------------------- ------------------ -----------
  2    6  Firewall Module                        WS-SVC-FWM-1       SAD10360485

Mod MAC addresses                       Hw    Fw           Sw           Status
--- ---------------------------------- ------ ------------ ------------ -------
  2  0018.ba41.5092 to 0018.ba41.5099   4.0   7.2(1)       4.0(16)      Ok

[...]
The preceding example shows that the Cisco FWSM is running software version 4.0(16) as indicated by the Sw column.

If a Virtual Switching System (VSS) is used to allow two physical Cisco Catalyst 6500 Series switches to operate as a single logical virtual switch, the show module switch all command can display the software version of all FWSMs that belong to switch 1 and switch 2. The output from this command will be similar to the output from show module <slot number> but will include module information for the modules in each switch in the VSS.

Products Confirmed Not Vulnerable

With the exception of Cisco ASA Software, no other Cisco products are currently known to be affected by these vulnerabilities.

Details

The Cisco FWSM is a high-speed, integrated firewall module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers. The FWSM offers firewall services with stateful packet filtering and deep packet inspection.

The Cisco FWSM is affected by two vulnerabilities, which are described in the following sections.

Cisco FWSM Command Authorization Vulnerability

A vulnerability in the authorization code of the Cisco Firewall Services Module (FWSM) could allow an authenticated but unprivileged, local attacker to delete, modify, or view the configuration of any other context of the affected system.

The vulnerability is due to insufficient authorization safeguards of certain administrative commands in a user context when the affected system is configured for multiple context mode. An attacker could exploit this vulnerability by executing certain commands in any of the user contexts of the affected system.

Note: An attacker would need to access the command-line interface of at least one user context and have enough privilege to execute the affected commands in to be able to exploit this vulnerability. This vulnerability affects only Cisco FWSM configured in multiple context mode when it is in either routed or transparent firewall mode.

This vulnerability is documented in Cisco bug ID CSCue46080 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2013-5506.


SQL*Net Inspection Engine Denial of Service Vulnerability

The SQL*Net protocol consists of different packet types that the SQL*Net inspection engine of the Cisco FWSM controls to make the data stream appear consistent with the Oracle applications on either side of the firewall.

A vulnerability in SQL*Net inspection engine code could allow an unauthenticated, remote attacker to cause a reload of the affected system.

The vulnerability is due to improper handling of segmented Transparent Network Substrate (TNS) packets. An attacker could exploit this vulnerability by sending a crafted sequence of segmented TNS packets through the affected system.

Note: Only transit traffic can be used to exploit this vulnerability. This vulnerability affects both routed and transparent firewall mode in both single and multiple context mode. This vulnerability can be triggered by IP version 4 (IPv4) and IP version 6 (IPv6) traffic.

This vulnerability is documented in Cisco bug ID CSCui34914 (registered customers only) and has been assigned CVE ID CVE-2013-5508.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response.

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:
http://intellishield.cisco.com/security/alertmanager/cvss

CSCue46080 - Cisco FWSM Command Authorization Vulnerability

Calculate the environmental score of CSCue46080

CVSS Base Score - 6.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Local

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 5.6

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed




CSCui34914 - SQL*Net Inspection Engine Denial of Service Vulnerability

Calculate the environmental score of CSCui34914

CVSS Base Score - 7.1

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

None

None

Complete

CVSS Temporal Score - 5.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of the Cisco FWSM Command Authorization Vulnerability may result in a complete compromise of the confidentiality, integrity and availability of the affected system. Successful exploitation of the SQL*Net Inspection Engine Denial of Service Vulnerability may result in a reload of an affected device, leading to a DoS condition.

Software Versions and Fixes

When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

The following table provides information on first fixed release for each of the vulnerability. The last row provides information about the release that fixes both vulnerabilities included in this security advisory.

   3.1
3.2
4.0
4.1
CSCue46080 - Cisco FWSM Command Authorization Vulnerability Migrate to 3.2.x or later1
3.2(25)1 Migrate to 4.1.(14) or later
4.1(13)

CSCui34914 - SQL*Net Inspection Engine Denial of Service Vulnerability
Migrate to 3.2.x or later 3.2(27) Migrate to 4.1(14) or later
4.1(14)
Recommended releases that fix all the vulnerabilities in this advisory
Migrate to 3.2.x or later 3.2(27) Migrate to 4.1(14) or later 4.1(14)



1Cisco FWSM Software releases prior to 3.1(8) and 3.2(4) are not affected by this vulnerability.

Workarounds

There is no workaround that mitigates the Cisco FWSM Command Authorization Vulnerability.

Disabling SQL*Net inspection will mitigate the SQL*Net Inspection Engine Denial of Service Vulnerability. The following commands will disable the default SQL*Net inspection configuration:
    ciscofwsm(config)# policy-map global_policy
    ciscofwsm(config-pmap)# class inspection_default
    ciscofwsm(config-pmap-c)# no inspect sqlnet

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

Customers Using Third-Party Support Organizations

Customers with Cisco products that 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 organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
  • +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 the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

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

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

These vulnerabilities were found during the resolution of support cases.

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 Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131009-fwsm

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:
  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.

Revision History

Revision 1.0 2013-October-09 Initial public release.

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.
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