Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in the Smart Call Home (SCH) feature of Cisco ASA Software could allow an unauthenticated, remote attacker to bypass digital certificate validation if any feature that uses digital certificates is configured on the affected system.
The vulnerability exists because when SCH is configured, a trustpoint, including a VeriSign certificate, is automatically installed. An attacker could exploit this vulnerability by presenting a valid certificate signed by VeriSign when authenticating to the affected system. An exploit could allow the attacker, for example, to bypass digital certificate authentication when used by a given feature. Examples of features that could be configured to use digital certificates validation include VPN and Adaptive Security Device Management (ASDM) authentication, TLS Proxy, and Phone Proxy.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
To exploit this vulnerability, an attacker may need to obtain additional information about the targeted device, such as whether the SCH feature is configured or has been configured on the system. However, this vulnerability still cannot be exploited unless there is another feature configured that relies on digital certificate validation services.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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Cisco has released a security advisory for Cisco bug ID CSCun10916 at the following link: cisco-sa-20141008-asa
Vulnerable Products
The following Cisco Adaptive Security Appliance (ASA) Software versions are affected:
- Cisco ASA Software 8.2 major release versions prior to 8.2(5.50)
- Cisco ASA Software 8.4 major release versions prior to 8.4(7.15)
- Cisco ASA Software 8.6 major release versions prior to 8.6(1.14)
- Cisco ASA Software 8.7 major release versions prior to 8.7(1.13)
- Cisco ASA Software 9.0 major release versions prior to 9.0(4.8)
- Cisco ASA Software 9.1 major release versions prior to 9.1(5.1)
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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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 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.
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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.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2014-Oct-08
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