Cisco Security Advisory
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AV:A/AC:L/Au:N/C:N/I:N/A:C/E:F/RL:OF/RC:C
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A vulnerability in PPP over Ethernet (PPPoE) processing on Cisco IOS XE for Cisco 1000 Series ASR routers could allow an unauthenticated, adjacent attacker to cause a reload of the affected device.
The vulnerability is due to improper processing of malformed PPPoE Active Discovery Request (PADR) packets. An attacker could exploit this vulnerability by sending PADR packets as part of PPPoE establishment. An exploit could allow the attacker to cause a reload of the affected device.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, an attacker must be on the same broadcast or collision domain as the targeted system. 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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Cisco has released bug ID CSCty94202 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 XE Software for Cisco ASR 1000 Series Routers Release 3.5.0S was vulnerable. Other releases of Cisco IOS XE Software for Cisco ASR 1000 Series Routers 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 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 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-07
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