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 Cisco ASR 1000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to the processing of excessive number of IPv4 packets that require fragmentation and reassembly. An attacker could exploit ths vulnerability by sending an excessive number of fragmented packets, causing high Cisco QuantumFlow Processor (QFP) CPU utilization in the Embedded Services Processor (ESP).
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, the attacker must send an excessive number of fragmented packets to the targeted system, making exploitation more difficult in environments that restrict 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 CSCuv71273 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 1000 Series Aggregation Services Routers version 15.5(3)S was vulnerable. Other releases may also be affected.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 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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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-Aug-31
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