Cisco NX-OS based devices contain a denial of service (DoS) vulnerability. An unauthenticated, remote attacker who can send a jumbo frame packet to the management interface of an affected device could cause the device to crash and reload.
The vulnerability is due to improper input validation of jumbo packets. Large packets that are sent through the switching fabric of the device will not trigger the vulnerability.
Cisco confirmed the vulnerability in a security advisory and released software updates.
Indicators of Compromise
Cisco NX-OS Software-based devices running an affected release of Cisco NX-OS Software are vulnerable.
Cisco has published a list of affected Cisco NX-OS Software Releases and affected Cisco NX-OS Software-based devices in a security advisory. The "Vendor Announcements" section of this alert contains a link to the advisory.
The vulnerability is due to improper input validation of jumbo packets processed by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending jumbo frame packets to the management interface of an affected device. If successful, the attacker could cause the targeted device to crash and reload, resulting in a DoS condition.
It is likely that an attacker would need access to an internal, trusted network to send jumbo frame packets to the management interface on a targeted device. This access requirement decreases 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.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
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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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.