Cisco Security Advisory
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AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:U/RC:C
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A vulnerability in the Message of the Day (MOTD) or banner functionality of the NX-OS Software could allow an unauthenticated, remote attacker to cause the login process to reset.
The vulnerability is due to the MOTD display handling when a certain type of terminal session is requested via Telnet. An attacker could exploit this vulnerability by repeatedly issuing a Telnet session to the NX-OS device, causing the login process to reset. An exploit could allow the attacker to cause the login process of the NX-OS device to reset repeatedly.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, an attacker would need to start a Telnet session with the targeted device. This requirement may decrease the likelihood of a successful exploit depending on how the targeted device is configured.
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 bug IDs CSCuo10554, CSCuu75466, CSCuu75471, CSCuu75484, CSCuu75498, CSCuu77182, and CSCuu77170 for registered users, which contain additional details and an up-to-date list of affected product versions.
Vulnerable Products
The following Cisco Nexus and Cisco Multilayer Director Switches running the following releases of Cisco NX-OS Software are affected.
- Cisco Nexus 5000 Series Switches running NX-OS Software release 6.0(2)N2(2)
- Cisco Nexus 7000 Series Switches running NX-OS Software release 6.2(12)
- Cisco MDS 9000 Series Multilayer Switches running NX-OS Software release 6.2(11)
- Cisco Nexus 9000 Series Switches running NX-OS Software release 7.0(3)
- Cisco Nexus 3000 Series Switches running NX-OS Software release 7.2(0)ZN(99.67)
- Cisco Nexus 4000 Series Switches running NX-OS Software release 4.1(2)E1(1f)
- Cisco Nexus 1000V Switches running NX-OS Software release 5.2(1)SV3(2.1)
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 contact the vendor regarding future updates and releases.
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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Software updates are not available.
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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 2015-Jun-10
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