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Vulnerability Alert

Cisco Adaptive Security Appliance SSL VPN Authentication Bypass Vulnerability

 
Threat Type:CWE-287: Authentication Issues
IntelliShield ID:33624
Version:1
First Published:2014 April 09 16:22 GMT
Last Published:2014 April 09 16:22 GMT
Port: Not available
CVE:CVE-2014-2128
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Harassment
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.4
Related Resources:
View related Security Advisory
 
 
Version Summary:Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions and access the SSL VPN Portal web page. Updates are available.
 
 
Description

A vulnerability in the SSL VPN code could allow an unauthenticated, remote attacker to access the SSL VPN portal web page.

The vulnerability is due to improper handling of authentication cookies when the Cisco ASA SSL VPN feature is enabled. An attacker could exploit this vulnerability by manually modifying the HTTP POST body with a forged cookie value or entering a crafted URL. An exploit could allow the attacker to gain unauthenticated access to the SSL VPN Portal page. Depending on the SSL VPN configuration, the attacker may also start a VPN tunnel by using Cisco AnyConnect.

In all cases, the attacker may gain unauthorized access to internal network resources.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
The following Cisco ASA Software versions are affected:
  • Cisco ASA Software versions prior to 8.2(5.47)
  • Cisco ASA Software versions prior to 8.3(2.40)
  • Cisco ASA Software versions prior to 8.4(7.3)
  • Cisco ASA Software versions prior to 8.6(1.13)
  • Cisco ASA Software versions prior to 9.0(3.8)
  • Cisco ASA Software versions prior to 9.1(3.2)
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link.

The SSL VPN feature must be enabled on a targeted device to exploit this vulnerability. Successful exploitation could allow the attacker to start a VPN tunnel via the AnyConnect client or by using SSL VPN cookies during the creation of an SSL VPN session. Both scenarios could allow unauthorized access to network resources that could be used to conduct further attacks.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCua85555 at the following link: cisco-sa-20140409-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to gain unauthorized access to internal network resources. A successful exploit could be used to conduct further attacks.
 
Technical Information
The vulnerability is due to improper handling of authentication cookies by the affected software when the SSL VPN feature is enabled.

An attacker could exploit this vulnerability by submitting a crafted URL to the targeted device. An exploit could allow the attacker to gain unauthenticated access to the SSL VPN Portal page and, depending on the SSL VPN configuration, start a VPN tunnel via AnyConnect.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

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.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Adaptive Security Appliance (ASA) Software 8.2 .0.45, .1, .1.11, .2, .2.9, .2.10, .2.12, .2.16, .2.17, .3, .4, .4.1, .4.4, .5, .5.13, .5.22, .5.26, .5.33, .5.40, .5.41, .5.46 | 8.3 .1, .1.1, .1.4, .1.6, .2, .2.4, .2.13, .2.23, .2.25, .2.31, .2.33, .2.34, .2.37, .2.39 | 8.4 .1, .1.3, .1.11, .2, .2.1, .2.8, .3, .3.8, .3.9, .4, .4.1, .4.3, .4.5, .4.9, .5, .5.6, .6, .7 | 8.6 .1, .1.1, .1.2, .1.5, .1.10, .1.12 | 9.0 .1, .2, .2.10, .3, .3.6 | 9.1 .1, .1.4, .2, .2.8, .3

Associated Products:
N/A




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LEGAL DISCLAIMER
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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