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 Label Distribution Protocol (LDP) message processing of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to stop accepting valid LDP sessions during a 60-second period.
The vulnerability is due to how certain malformed LDP Hello messages are parsed. An attacker could exploit this vulnerability by sending malformed LDP Hello messages to an affected device. An exploit could allow the attacker to cause an affected device to stop accepting valid LDP sessions during a 60-second period.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
To exploit this vulnerability, an attacker would likely need access to trusted, internal networks to send LDP Hello messages to an affected device. This access requirement limits the possibility of a successful exploit.
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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Customers are advised to consult Cisco bug ID CSCul88851 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco NX-OS Software Release 6.2(2a) and prior were vulnerable. Later releases of Cisco NX-OS Software may also be vulnerable.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 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 2014-Jan-23
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