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Cisco Security Advisory

Multiple Vulnerabilities in Cisco Email Security Appliance

Advisory ID: cisco-sa-20130626-esa

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130626-esa

Revision 1.0

For Public Release 2013 June 26 16:00  UTC (GMT)

Related Resources:

View related Applied Mitigation Bulletin

Summary

Cisco IronPort AsyncOS Software for Cisco Email Security Appliance is affected by the following vulnerabilities:

  • Web Framework Authenticated Command Injection Vulnerability
  • IronPort Spam Quarantine Denial of Service Vulnerability
  • Management GUI Denial of Service Vulnerability
Successful exploitation of the Web Framework Authenticated Command Injection Vulnerability could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system with elevated privileges.
Successful exploitation of either of the two denial of service vulnerabilities may cause several critical processes to become unresponsive and make the affected system unstable.



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-20130626-esa

Affected Products

Vulnerable Products

All models of Cisco Email Security Appliance running a vulnerable version of Cisco IronPort AsyncOS Software are affected by one or more of the vulnerabilities described in this advisory.

Some of the vulnerabilities described in this advisory affect Cisco IronPort AsyncOS Software for Cisco Web Security and Cisco Content Management Security Appliance.
Consult the Cisco security advisory Multiple Vulnerabilities in Cisco Web Security Appliance at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130626-wsa for additional information about the vulnerabilities affecting Cisco Web Security Appliance and Cisco security advisory Multiple Vulnerabilities in Cisco Content Management Security Appliance at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130626-sma for additional information about the vulnerabilities affecting Cisco Content Management Security Appliance.


Determining the Running Software Version

To determine whether a vulnerable version of Cisco IronPort AsyncOS Software is running on an appliance, administrators can issue the version command. The following example shows a device running Cisco IronPort AsyncOS Software version 7.6.2-201:

ciscoesa> version
Current Version
===============
Product: Cisco IronPort X1070 Messaging Gateway(tm) Appliance
Model: X1070
Version: 7.6.2-201
[...]

Products Confirmed Not Vulnerable

With the exception of Cisco Content Security Management and Cisco Web Security Appliances, no other Cisco products are currently known to be affected by these vulnerabilities.

Details

The Cisco Email Security Appliance provides email management and protection combining antispam, antivirus, and encryption technologies.

Web Framework Authenticated Command Injection Vulnerability

A vulnerability in the web framework code could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system with elevated privileges.  

The vulnerability is due to a failure to properly sanitize user supplied input that is subsequently utilized to perform an action that leverages the underlying command-line interface of the device. An authenticated but unprivileged attacker could exploit this vulnerability by sending a crafted URL to the affected system, or by convincing a valid user to click on a malicious URL. A successful exploit could allow an attacker with sufficient knowledge to take complete control of the affected device.

This vulnerability can be triggered by IPv4 and IPv6 traffic directed to the management IP addresses of the affected system.
This vulnerability can be exploited over the default management ports, TCP port 80 or TCP port 443.

Note: The default management ports can be reconfigured on the system.

This vulnerability is documented by Cisco bug ID CSCzv44633 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2013-3384.

IronPort Spam Quarantine Denial of Service Vulnerability

A vulnerability in the IronPort Spam Quarantine (ISQ) function in the web framework code could allow an unauthenticated, remote attacker to cause multiple critical processes to become unresponsive, resulting in a denial of service condition.

The vulnerability is due to improper handling and processing of TCP connection requests sent at high rate. An attacker could exploit this vulnerability by a sending sequence of TCP requests to the ISQ service port that is open on the ISQ-enabled interfaces of the affected system. A full TCP three-way handshake is required to exploit this vulnerability. An successful exploit could allow the attacker to crash or make unresponsive the ISQ service and cause other critical processes to become unresponsive, resulting in a denial of service condition. A hard reboot of the affected system is needed to restore full functionality.

This vulnerability can be triggered by IPv4 and IPv6 traffic directed to ISQ enabled interfaces of the affected system.
This vulnerability can be exploited over the default ISQ ports, TCP port 82 or TCP port 83.

Note: The default ISQ ports can be reconfigured on the system.

This vulnerability is documented by Cisco bug ID
CSCzv25573 (registered customers only) and has been assigned CVE ID CVE-2013-3386.

Management GUI Denial of Service Vulnerability

A vulnerability in the Graphical User Interface (GUI) function in the web framework code could allow an unauthenticated, remote attacker to cause multiple processes to become unresponsive, resulting in a denial of service condition.

The vulnerability is due to improper handling, processing and termination of HTTP and HTTPS connections. An attacker could exploit this vulnerability by sending multiple HTTP or HTTPS requests to any management enabled interfaces of the affected system. A full TCP three-way handshake is required to exploit this vulnerability. An exploit could allow the attacker prevent management access via the GUI and cause other critical process to become unresponsive, resulting in a denial of service condition. A hard reboot of the affected system is needed to restore full functionality.

This vulnerability can be triggered by IPv4 and IPv6 traffic directed to the management IP addresses of the affected system. This vulnerability can be exploited over the default management ports, TCP port 80 or TCP port 443.

Note: The default management ports can be reconfigured on the system.

This vulnerability is documented by Cisco bug ID
CSCzv63329 (registered customers only) and has been assigned CVE ID CVE-2013-3385.

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



CSCzv44633 - Web Framework Authenticated Command Injection Vulnerability

Calculate the environmental score of CSCzv44633

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




CSCzv25573 - IronPort Spam Quarantine Denial of Service Vulnerability

Calculate the environmental score of CSCzv25573

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed




CSCzv63329 - Management GUI Denial of Service Vulnerability

Calculate the environmental score of CSCzv63329

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Impact

Successful exploitation of the Web Framework Authenticated Command Injection Vulnerability could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system with elevated privileges.
Successful exploitation of either of the two DoS vulnerabilities could cause several critical processes to become unresponsive and make the affected system unstable.

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 lists the first fixed releases that contain the fixes for the Web Framework Authenticated Command Injection Vulnerability:

 Major Release
 First Fixed In
 7.1 and prior
 7.1.5-104
 7.3  7.3.2-026
 7.5  7.5.2-203
 7.6  7.6.3-019
 8.0  Not Affected



The following table lists the first fixed releases that contain the fixes for the IronPort Spam Quarantine Denial of Service Vulnerability:

 Major Release
 First Fixed In
 7.1 and prior
 7.1.5-106
 7.3  Not available; migrate to  8.0.0-671 or later
 7.5  Not available; migrate to 7.6.3-019 or later
 7.6  7.6.3-019
 8.0  Not Affected

The following table list the first fixed releases that contain the fixes for the Management GUI Denial of Service Vulnerability:

 Major Release
 First Fix In
 7.1 and prior
 7.1.5-106
 7.3  Not available, migrate to 8.0.0-671 or later
 7.5  Not available, migrate to 7.6.3-019 or later
 7.6  7.6.3-019
 8.0  Not Affected

The following table lists the recommended releases that include the fixes for all the vulnerabilities described in this security advisory:

 Major Release
 Recommended
 7.1 and prior
 7.1.5-106 or later
 7.3  8.0.0-671 or later
 7.5  7.6.3-019 or later
 7.6  7.6.3-019 or later

Workarounds

The Web Framework Authenticated Command Injection Vulnerability and Management GUI Denial of Service Vulnerability could be mitigated by disabling management access to the affected system GUI.
Administrators can use the interfaceconifg command to disable appliance management via the GUI. Alternatively, this can be done via the GUI by editing the management interface properties under Network->IP interfaces-> Edit and then selecting Disable Appliance Management.

Note:
Administrators can manage the affected system via SSH and command-line interface while GUI access is disabled. However, not all commands and features may be available via command-line interface.

Administrators can also limit the attack surface by restricting IP addresses that can access the management interface. This can be done using the adminaccessconfig command and selecting IPACCESS from the menu.

Administrator should also implement Cross-Site Request Forgery protection if available on their platform and software release. This will help limit the attack surface of the Web Framework Authenticated Command Injection Vulnerability, although it will not completely eliminate it.

The IronPort Spam Quarantine Denial of Service Vulnerability can be mitigated by disabling the end-user access to the ISQ service. Administrators can disable this access using the interfaceconfig command. Alternatively, this can be done via the GUI by editing the settings for Spam Quarantine under Monitor->Quarantines-> Edit and then unchecking the option "Enable End-User Quarantine Access".

Note:
Users will be unable to manage their safe list and block list while end-user access is disabled.

Additional workaround details are available in the companion Applied Mitigation Bulletin (AMB) at the following location:
http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=29452

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 identified during an internal security review of the affected products.

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 at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130626-esa

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-June-26 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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