Vulnerability Alert

Multiple Cisco Products Management GUI Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:29728
Version:1
First Published:2013 June 26 16:28 GMT
Last Published:2013 June 26 16:28 GMT
Port: Not available
CVE:CVE-2013-3385
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:Multiple Cisco products contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
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.

Cisco has confirmed the vulnerability in multiple security advisories and has released software updates.
 
Warning Indicators
The following Cisco products are vulnerable:
  • Cisco Email Security Appliance (ESA) prior to 7.1.5-106 and prior to 7.6.3-019
  • Cisco Web Security Appliance (WSA) prior to 7.1.3-013, 7.1.4-101, 7.5.0-838, 7.5.1-201, and 7.7.0-602
  • Cisco Content Security Management Appliance (SMA) prior to 7.9.1-102 and 8.0.0-404
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send multiple HTTP or HTTPS requests to any management-enabled interfaces of the affected system while establishing a full TCP three-way handshake. This access requirement limits the possibility of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released security advisories for bug IDs CSCzv63329, CSCzv58669, and CSCzv78669 at the following links: cisco-sa-20130626-esa, cisco-sa-20130626-wsa, and  cisco-sa-20130626-sma
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause several critical processes on a targeted system to become unresponsive, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to improper handling, processing, and termination of HTTP and HTTPS connections by the affected device.

An attacker could exploit this vulnerability by sending multiple HTTP or HTTPS requests to any management-enabled interfaces of the affected system. If successful, the attacker could prevent management access via the GUI and cause other critical processes to become unresponsive, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators may consider disabling management access to the GUI or restricting IP addresses that can access the management interface as mitigation strategies. Details about these actions are in the security advisories listed in the "Vendor Announcements" section of this alert.

It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and DoS attacks. For configuration details, see Protecting Your Core: Infrastructure Protection Access Control Lists.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of the Multiple Vulnerabilities in Cisco Content Security Management, Web Security, and Email Security Appliances

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
3050/0Half-open SYN AttackS6362012 Mar 28 
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco Web Security Appliance (WSA) 7.1 .0, .1, .2, .3, .4
CiscoCisco Email Security Appliance (ESA) 7.1 .0, .1, .2, .3, .4, .5 | 7.3 .0, .1, .2 | 7.5 .0, .1, .2 | 7.6 .0, .1, .2
CiscoCisco Content Security Management Appliance (SMA) 7.2 .0, .1, .2 | 7.7 .0, .1 | 7.9 .0, .1 | 8.0 .0

Associated Products:
N/A




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The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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