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Vulnerability Alert

Cisco Adaptive Security Appliance Software Clientless SSL VPN Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:31107
Version:1
First Published:2013 October 09 19:42 GMT
Last Published:2013 October 09 19:42 GMT
Port: Not available
CVE:CVE-2013-5515
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the Clientless SSL VPN code could allow an unauthenticated, remote attacker to cause the reload of the affected system.

The vulnerability is due to improper handling of crafted HTTPS requests against the Cisco ASA Software configured for Clientless SSL VPN. An attacker could exploit this vulnerability by sending crafted HTTPS requests targeting the TCP port open for the Clientless SSL VPN feature.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco Adaptive Security Appliance Software versions prior to 8.2(5.44), 8.3(2.39), 8.4(5.7), 8.6(1.12), 9.0(2.6), and 9.1(1.7) are vulnerable.
 
IntelliShield Analysis
Attackers must send malicious HTTPS requests directly to the targeted device. Depending on device configuration, the attacker may require access to trusted networks or devices, limiting the potential for exploitation.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCua22709 at the following link: cisco-sa-20131009-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to reload, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper handling of HTTPS requests that are processed as part of SSL VPN connections.

An unauthenticated, remote attacker could exploit this vulnerability by sending malicious HTTPS requests to the targeted device. The processing of the malicious requests could cause the device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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 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 8.0 .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 .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 | 8.4 .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 | 8.6 .1, .1.1, .1.2, .1.5, .1.10 | 9.0 .1, .2 | 9.1 .1, .1.4

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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