Cisco Security Advisory
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AV:N/AC:M/Au:N/C:P/I:N/A:N/E:H/RL:OF/RC:C
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Cisco software contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information on a targeted system.
The vulnerability is in the encryption library used by the vulnerable software. This library allows a portion of an encrypted packet to be sent unencrypted in the following packet. The vulnerability occurs only when IP Security (IPsec) is used, as with VPN environments. If an unauthenticated, remote attacker could access an encrypted session, the attacker could obtain unencrypted packets that would contain information. The attacker may benefit from this information and possibly launch further attacks.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, an attacker must have access to a specific combination of hardware modules and encryption libraries in a targeted device. In many cases, this access may require the attacker to have access to internal, trusted networks. These access requirements may limit the potential of a successful exploit.
A successful exploit requires an attacker to have access to the encrypted packet stream. In addition, the attacker cannot control which packets or what portion of the packet will be subject to this vulnerability. However, there is a potential that the decrypted portion of a packet may contain sensitive information.
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Cisco has confirmed this vulnerability in the following Cisco bug IDs: CSCtu22280, CSCtx88621, and CSCty25257.
Vulnerable Products
The following Cisco IOS Software releases are vulnerable:
- Cisco IOS Software releases 15.2(1)T, 15.2(1)T1, 15.2(2)T
- Cisco MDS 9222i Multiservice Modular Switch
- Cisco MDS 9000 18/4-Port Multiservice Module
- Cisco MDS 9000 Storage Services Node module
- Cisco IOS 12.2(33)SXI
- Cisco IOS 12.2(33)SXJ
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 may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor critical 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 e-mail 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 2012-Sep-13
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