Cisco NX-OS based products contain a buffer overflow vulnerability within the Cisco Discovery Protocol (CDP) subsystem. This could allow an unauthenticated, adjacent attacker with the ability to send a malicious packet to the affected device to trigger a buffer overflow condition. This could potentially lead to the ability of the attacker to execute arbitrary code with elevated privileges.
Cisco confirmed these vulnerabilities in a security advisory and released software updates.
Indicators of Compromise
Cisco NX-OS-based devices running an affected version of Cisco NX-OS Software are affected.
Cisco has published a list of affected Cisco NX-OS Software releases and affected Cisco NX-OS-based products in the security advisory. The "Vendor Announcements" section of this alert contains a link to the advisory.
The vulnerabilities are due to insufficient validation of user-supplied input processed by the CDP subsystem in the affected software.
An unauthenticated, adjacent attacker could exploit these vulnerabilities by submitting malformed CDP packets to an affected device. Processing the malformed packets could cause a buffer overflow condition that the attacker could use to execute arbitrary code with elevated privileges on the device.
Because CDP works at the data link layer (Layer 2), an attacker must be able to submit an Ethernet frame directly, requiring an attacker to have access to a trusted, internal network to exploit this vulnerability. This access requirement reduces the likelihood of a successful attack.
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.