Cisco Security Advisory

Cisco SA 500 Series Security Appliances Web Management Interface Vulnerabilities

Advisory ID: cisco-sa-20110720-sa500

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110720-sa500

Revision 1.0

For Public Release 2011 July 20 16:00  UTC (GMT)


Summary

Cisco SA 500 Series Security Appliances are affected by two vulnerabilities on their web-based management interface. An attacker must have valid credentials for an affected device to exploit one vulnerability; exploitation of the other does not require authentication. Both vulnerabilities can be exploited over the network.

Cisco has released free software updates that address these vulnerabilities.

Workarounds that mitigate these vulnerabilities are available.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110720-sa500.

Affected Products

Vulnerable Products

These vulnerabilities affect the following devices running a software version prior to the first fixed release documented in the Software Versions and Fixes section of this advisory:

  • Cisco SA520
  • Cisco SA520W
  • Cisco SA540

There are multiple methods to determine the version of system software that is running on a device. At the device web login screen, the system software version is displayed under the "Security Appliance Configuration Utility" heading. Administrators can also log in to a device through the web management interface and navigate to Administration > Firmware & Configuration > Network. The Primary Firmware field appears below Status Information. The number directly beside the Primary Firmware field is the system software version. Alternately, after logging in to the device, administrators can click on the About link on top right side of the screen. The system software version will be displayed below the "Security Appliance Configuration Utility" heading. An example of the system firmware version is 2.1.18.

Products Confirmed Not Vulnerable

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

Details

Cisco SA 500 Series Security Appliances, which are part of the Cisco Small Business Pro Series, are comprehensive gateway security solutions that combine firewall, VPN, optional intrusion prevention, and web, and e-mail security capabilities.

Cisco SA 500 Series Security Appliances are affected by two web management interface vulnerabilities:

  • SQL Injection Vulnerability

    The login form of the SA 500 Series Security Appliances is vulnerable to a SQL injection vulnerability that could allow an unauthenticated, remote attacker to obtain usernames and passwords that are configured on an affected device.

    This vulnerability is documented in Cisco bug ID CSCtq65669 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-2546
  • Privilege Escalation Vulnerability

    An authenticated user who is logged in to an affected device could exploit this vulnerability to inject arbitrary commands into the underlying operating system. By supplying malicious parameters through several web forms, the attacker could gain root privileges.

    This vulnerability is documented in Cisco bug ID CSCtq65681 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-2547

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

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

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .

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


CSCtq65669: SQL injection vulnerability

Calculate the environmental score of CSCtq65669

CVSS Base Score - 5.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Partial

None

None

CVSS Temporal Score - 4.1

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCtq65681: Privilege escalation vulnerability

Calculate the environmental score of CSCtq65681

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Impact

Successful exploitation of the SQL injection vulnerability could allow the retrieval of usernames and passwords. An authenticated user could exploit the privilege escalation vulnerability to execute underlying operating system commands.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Small Business Support Center or your contracted maintenance provider for assistance.

These vulnerabilities have been corrected in software versions 2.1.19 and later.

If administrators of SA 500 Series Security Appliances have configured the Check for New Firmware notification under Administration > Firmware & Configuration > Network, a message regarding new firmware that is available on Cisco.com will be displayed at the next log in to the appliance. Note: the SA 500 will not perform an automatic upgrade to version 2.1.19. The upgrade must be performed by an administrator.

The latest software for SA 500 Series Security Appliances can be downloaded at http://www.cisco.com/cisco/software/navigator.html?mdfid=282414017 (registered customers only)


Workarounds

The following mitigations help limit the exposure to these vulnerabilities.

  • Disable Remote Management

    Caution: Do not disable remote management if administrators manage devices via the WAN connection. This action will result in a loss of management connectivity to the device. Several features also require remote management to be enabled, including SSL VPN access and the Cisco Quick Virtual Private Network (QVPN) Utility.

    Remote Management is disabled by default. Administrators can disable this feature by choosing Network Management > Remote Management. Change the setting for this field to Disabled.
    Disabling remote management limits exposure because the vulnerabilities can then be exploited from the inter-LAN network only. 

    Disabling remote management limits the exposure as the vulnerabilities can then only be exploited from the inter LAN network.
  • Limit Remote Management Access to Specific IP Addresses

    If remote management is required, secure the device so that it can be accessed by certain IP addresses only, rather than the default setting of All IP Addresses. After choosing Network Management > Remote Management, an administrator can change the Remote IP Address field to ensure that only devices with specified IP addresses can access the device.

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. If the information is not clear, please contact the Cisco Small Business Support Center or your contracted maintenance provider for assistance. Small Business Support Center contacts are as follows.

+1 866 606 1866 (toll free from within North America)

+1 408 418 1866 (toll call from anywhere in the world)

Customers should have their product serial number available.

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

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 that are described in this advisory.

These vulnerabilities were reported to Cisco by Michal Sajdak of Securitum, Poland.

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-20110720-sa500

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 1.0

2011-July-20

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.


Download this document (PDF)
View Printable Version