National Cyber-Alert System
Vulnerability Summary for CVE-2009-1156
Original release date:04/09/2009
Last revised:04/28/2009
Source:
US-CERT/NIST
Overview
Unspecified vulnerability on Cisco Adaptive Security Appliances (ASA) 5500 Series devices 8.0 before 8.0(4)25 and 8.1 before 8.1(2)15, when an SSL VPN or ASDM access is configured, allows remote attackers to cause a denial of service (device reload) via a crafted (1) SSL or (2) HTTP packet.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
6.9
Exploitability Subscore:
5.5
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type:Allows disruption of serviceUnknown
Per vendor advisory: http://www.cisco.com/en/US/products/products_security_advisory09186a0080a994f6.shtml
VPN Authentication Bypass Vulnerability
The Cisco ASA or Cisco PIX security appliance can be configured to override an account-disabled indication from a AAA server and allow the user to log on anyway. However, the user must provide the correct credentials in order to login to the VPN. A vulnerability exists in the Cisco ASA and Cisco PIX security appliances where VPN users can bypass authentication when the override account feature is enabled.
Note: The override account feature was introduced in Cisco ASA software version 7.1(1).
The override account feature is enabled with the override-account-disable command in tunnel-group general-attributes configuration mode, as shown in the following example. The following example allows overriding the "account-disabled" indicator from the AAA server for the WebVPN tunnel group "testgroup":
hostname(config)#tunnel-group testgroup type webvpn
hostname(config)#tunnel-group testgroup general-attributes
hostname(config-tunnel-general)#override-account-disable
Note: The override account feature is disabled by default.
References to Advisories, Solutions, and Tools
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External Source: CISCO
Name: 20090408 Multiple Vulnerabilities in Cisco ASA Adaptive Security Appliance and Cisco PIX Security Appliances
Type: Advisory; Patch Information
External Source: VUPEN
Name: ADV-2009-0981
External Source: SECTRACK
Name: 1022015
External Source: BID
Name: 34429
External Source: SECUNIA
Name: 34607
External Source: OSVDB
Name: 53442
