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 Point-to-Point Tunneling Protocol-Application Level Gateway (PPTP-ALG) of the Cisco CRS Carrier Grade Services Engine (CGSE) and Cisco ASR 9000 Series Integrated Service Module (ISM) could allow an unauthenticated, remote attacker to cause the service interface module to reset.
The vulnerability is due to processing of packet sequences in the PPTP-ALG. An attacker could exploit this vulnerability by sending specific streams of traffic through the device. An exploit could allow the attacker to cause the service module to reset.
Cisco has confirmed the vulnerability in a security notice and released software updates.
To exploit this vulnerability, the attacker must send a crafted stream of traffic through the targeted system. To achieve this objective, the attacker may need to access trusted, internal network resources. This access requirement reduces 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 CSCue91963 for the most complete list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco IOS XR Software Releases 4.3.1 and prior were vulnerable. Later releases of Cisco IOS XR 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 can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to allow only trusted users to have network access.
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-Sep-26
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