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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A vulnerability in the Open Shortest Path First (OSPF) protocol implementation of the Cisco Aggregation Services Router (ASR) 5000 and ASR 5500 System Software could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition because the OSPF process restarts.
The vulnerability is due to improper input validation of the length fields in the OSPF packet header. An attacker could exploit this vulnerability by sending crafted OSPF packets to the device. An exploit could allow the attacker to cause a partial DoS condition because the OSPF process could restart when parsing the crafted OSPF packet.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker would need to send crafted OSPF packets to the targeted device, making exploitation more difficult in environments that restrict network access from untrusted sources.
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 ID CSCuv62820 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco ASR 5000 Series Software release 19.0.M0.60828 was vulnerable. Later releases of Cisco ASR 5000 Series 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 apply the appropriate updates.
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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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 email 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 2015-Aug-20
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