Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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Cisco Small Business Switches contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition to features that rely on SSH or SSL protocols.
The vulnerability is due to the processing flaw in malformed packets in the code used by SSH and SSL. An unauthenticated, remote attacker could exploit this vulnerability by sending malformed SSH or SSL packets to the device. An exploit could allow the attacker to cause a denial of service for the features requiring SSH or SSL support.
Cisco has confirmed this vulnerability and released updated software.
To exploit this vulnerability, an attacker must be able to send crafted SSH or SSL packets to the targeted device which may require the attacker to have access to trusted, internal networks, decreasing the likelihood of a successful attack.
The vulnerability does not affect the entire device. Features that need the SSL/TLS layer to encrypt data such as SSH, HTTPS, and Secure Sensitive Data are affected.
Cisco would like to thank Hisashi Kojima and Masahiro Nakada of Fujitsu Laboratories LTD for discovering this vulnerability.
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Cisco has confirmed this vulnerability in the following Cisco bug ID: CSCua30246
Vulnerable Products
The following Cisco Small Business Series Switches are vulnerable:- Cisco Small Business 200 Series Smart Switch versions 1.2.7.76 and prior
- Cisco Small Business 300 Series Managed Switch versions 1.2.7.76 and prior
- Cisco Small Business 500 Series Stackable Managed Switch version 1.2.7.76 and prior
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 can help protect affected systems from external attacks by using a solid firewall strategy.
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 2013-Mar-06
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