Cisco Security Advisory
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AV:N/AC:M/Au:N/C:P/I:P/A:N/E:F/RL:OF/RC:C
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A vulnerability in the remote support functionality of Cisco WSAv, Cisco ESAv, and Cisco SMAv Software could allow an unauthenticated, remote attacker to decrypt and impersonate secure communication between any virtual content security appliances.
The vulnerability is due to the presence of default SSH host keys that are shared across all the installations of WSAv, ESAv, and SMAv. An attacker could exploit this vulnerability by obtaining one of the SSH private keys and using it to impersonate or decrypt communication between any WSAv, ESAv, or SMAv. An exploit could allow the attacker to decrypt and impersonate secure communication between any virtual content security appliances.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
To exploit this vulnerability, an attacker must first stage a man-in-the-middle attack between the targeted device and the host. This requirement may increase the difficulty of a successful exploit.
A successful exploit of this vulnerability may allow the attacker to decrypt communication and access sensitive information, impersonate a targeted device and send modified data to a configured content appliance, or limit SSH access to any content appliance managed by the targeted device, which could be used to conduct further attacks.
Only virtual WSA, ESA, and SMA appliances are affected by this vulnerability. Cisco WSA, Cisco ESA, and Cisco Content Security Management Appliance are not affected by this vulnerability.
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 IDs CSCus29681, CSCuu95676, CSCuu96601, and CSCuv13980 at the following link: cisco-sa-20150625-ironport
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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 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 Multiple Cisco products contain a vulnerability that could allow an unauthenticated, remote attacker to decrypt and impersonate secure communication between any virtual content security appliances. Updates are available. NA Final 2015-Jun-25
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