Cisco Security Advisory
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AV:N/AC:L/Au:S/C:N/I:N/A:C/E:U/RL:OF/RC:C
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Cisco IOS Software contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to improper handling of login banners by Cisco IOS Software. An authenticated, remote attacker could exploit this vulnerability by logging in via SSH using two sessions. If successful, the attacker could cause the device to reload, resulting in a DoS condition.
Cisco confirmed the vulnerability in software release notes and released updated software.
To exploit the vulnerability, an attacker must be able to log in via SSH to a targeted device. The access requirement restricts the source of exploits to current users of an affected system. Exploits may happen accidentally when a legitimate user attempts to log in using two SSH sessions.
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Cisco confirmed this vulnerability in Cisco bug ID CSCto62631.
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Administrators are advised to apply the appropriate updates.
Administrators may consider disabling the banner login command.
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 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 2011-Aug-24
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