Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to improper handling of packets by Cisco 1000 Series ASR configured for bridge domain interface (BDI). An attacker could exploit this vulnerability by sending packets that will traverse a vulnerable system. This vulnerability cannot be triggered by sending traffic to a vulnerable device.
A successful exploit could allow the attacker to cause a system to reload, resulting in a DoS condition. Repeated exploitation could result in a sustained DoS condition.
Cisco confirmed the vulnerability in a security advisory and released updated software.
Cisco ASR 1000 Series Aggregation Services Routers running affected releases of Cisco IOS XE Software are affected by this vulnerability.
Cisco has published a list of affected Cisco IOS XE Software releases in the security advisory. The "Vendor Announcements" section of this alert contains a link to the advisory.
To exploit this vulnerability, an attacker may need access to a trusted, internal network to send packets through a vulnerable system. This access requirement may reduce 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.
An unauthenticated, remote attacker could exploit this vulnerability to reload the Embedded Services Processors (ESP) card on a targeted device, resulting in a DoS condition. Repeated exploitation could result in a sustained DoS condition.
The vulnerability is due to improper handling of packets by Cisco 1000 Series ASR devices running the affected software and configured with the BDI feature. The vulnerability can be triggered by sending traffic that will traverse a vulnerable device.
An unauthenticated, remote attacker could exploit this vulnerability by sending packets that will traverse a vulnerable system. If successful, the attacker could cause a targeted device to reload, resulting in a DoS condition.
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.
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 e-mail at firstname.lastname@example.org.
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