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 Local Packet Transport Services (LPTS) network stack of Cisco IOS XR for Cisco ASR9k could allow an unauthenticated, remote attacker to cause a limited denial of service (DoS) condition on an affected platform.
The vulnerability is due to improper handling of flow base entries by LPTS that can cause some TCP and UDP ports to be erroneously opened for network access. An attacker could exploit this vulnerability by sending continuous connection attempts to the open ports and cause an exhaustion of services. An exploit could allow the attacker to cause a limited denial of service (DoS) condition on an affected platform.
Cisco has confirmed the vulnerability and released software updates.
Only devices that have enabled LPTS are vulnerable to exploitation, reducing the potential number of affected systems in most environments.
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Cisco has released bug ID CSCur88273 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 IOS XR for Cisco ASR9k versions 5.1.2, 5.1.3, 5.2.1, and 5.2.2. were vulnerable. Later versions of Cisco IOS XR for Cisco ASR9k 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 apply the appropriate updates.
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-Jul-22
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