Vulnerability Alert

Cisco ASA Software VPN Group Enumeration Vulnerability

 
Threat Type:CWE-200: Information Leak / Disclosure
IntelliShield ID:29025
Version:1
First Published:2013 April 18 14:22 GMT
Last Published:2013 April 18 14:22 GMT
Port: Not available
CVE:CVE-2013-1194
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Harassment
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.1
 
Version Summary:Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to enumerate remote access VPN groups. Updates are available.
 
 
Description
A vulnerability in the Internet Security Association and Key Management Protocol (ISAKMP) implementation in Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to enumerate remote access VPN groups configured in a Cisco ASA device.

The vulnerability is due to differences in the way Cisco ASA Software responds to Internet Key Exchange (IKE) aggressive mode messages when valid and invalid VPN groups are provided in the AM1 message. An attacker could exploit this vulnerability by sending crafted IKE messages to a Cisco ASA device that is configured as a VPN headend.

This vulnerability was discovered by Daniel Turner of Trustwave SpiderLabs. Cisco would like to thank Trustwave SpiderLabs for reporting this issue and working with us toward coordinated disclosure of this vulnerability.

Cisco has confirmed the vulnerability in a security notice and software updates are available.
 
Warning Indicators
At the time this alert was first published, Cisco ASA Software versions 9.1.2 and prior were vulnerable. Later versions of Cisco ASA Software may also be affected.
 
IntelliShield Analysis
To exploit the vulnerability, an attacker may need access to trusted, internal networks to send crafted IKE messages to the targeted system. This access requirement may reduce the likelihood of a successful attack.

Customers are advised to review the bug report in the vendor announcements section for a current list of affected versions.

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 a security notice for bug ID CSCue73708 at the following link: CVE-2013-1194
 
Impact
An unauthenticated, remote attacker to enumerate remote access VPN groups configured on a targeted device. Successful exploitation could allow an attacker the ability to access sensitive information.
 
Technical Information
The vulnerability is in the ISAKMP implementation in the affected software. The vulnerability is due to the way the affected software responds to IKE aggressive mode messages when valid and invalid VPN groups are provided in the AM1 message.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted IKE messages to a targeted device that is configured as a VPN headend. If successful, the attacker could enumerate remote access VPN groups on the targeted device, which could be used to conduct further attacks.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

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

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com for assistance.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco Adaptive Security Appliance (ASA) Software 7.0 Base, .1.4, .1, .2, .3, .4, .4.2, .5, .5.12, .6, .6.4, .6.8, .6.18, .6.22, .6.26, .6.29, .6.32, .7, .7.1, .7.4, .7.9, .7.12, .8, .8.2, .8.8, .8.12, .8.13 | 7.1 .2, .2.16, .2.20, .2.24, .2.28, .2.38, .2.42, .2.46, .2.49, .2.53, .2.61, .2.64, .2.72, .2.81 | 7.2 .1, .1.9, .1.13, .1.19, .1.24, .2, .2.6, .2.10, .2.14, .2.18, .2.19, .2.22, .2.34, .3, .3.1, .3.12, .3.16, .4, .4.6, .4.9, .4.18, .4.25, .4.27, .4.30, .4.33, .5, .5.2, .5.4, .5.7, .5.8, .5.10 | 8.0 .1.2, .2, .2.11, .2.15, .3, .3.6, .3.12, .3.19, .4, .4.3, .4.9, .4.16, .4.23, .4.25, .4.28, .4.31, .4.32, .4.33, .5, .5.20, .5.23, .5.25, .5.27, .5.28, .5.31 | 8.1 Base, .1, .1.6, .2, .2.13, .2.15, .2.16, .2.19, .2.23, .2.24, .2.49, .2.50, .2.55, .2.56 | 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 | 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 | 8.4 Base, .1, .1.3, .1.11, .2, .2.8, .3, .3.8, .3.9, .4, .4.1, .4.3, .4.5, .4.9, .5, .5.6, .6 | 8.5 Base, .1, .1.1, .1.6, .1.7, .1.14, .1.17 | 8.6 Base, .1, .1.1, .1.2, .1.5, .1.10 | 8.7 .1, .1.1, .1.3, .1.4 | 9.0 Base, .1, .2 | 9.1 Base, .1, .1.4, .2

Associated Products:
N/A




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