Cisco Security Advisory
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AV:N/AC:M/Au:N/C:N/I:P/A:P/E:F/RL:OF/RC:C
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A vulnerability in the Open Shortest Path First version 3 (OSPFv3) implementation in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a crash of the OSPFv3 process on an affected device.
The vulnerability is due to improper parsing of malformed type 1 link-state advertisement (LSA) packets. An attacker could exploit this vulnerability by sending a malformed type 1 LSA packet to a vulnerable device. An exploit could allow the attacker to cause a crash of the OSPFv3 process on an affected device, which may lead to a denial of service (DoS) condition.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, an attacker may need access to trusted, internal networks, in which such a device would typically be located, to send malformed type 1 LSA packets to. This access requirement decreases the likelihood 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 CSCuj82176 for a complete list of affected product versions.
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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 affected systems.
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Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com for assistance.
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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-Nov-07
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