Cisco NX-OS/FXOS Discovery Protocol Packet stack-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Cisco NX-OS and FXOS. This affects an unknown part of the component Discovery Protocol Packet Handler. Executing a manipulation can lead to stack-based overflow. This vulnerability is handled as CVE-2022-20824. The attack can only be done within the local network. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco NX-OS and FXOS (Router Operating System) (affected version not known). It has been declared as critical. This vulnerability affects some unknown functionality of the component Discovery Protocol Packet Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in the Cisco Discovery Protocol feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper input validation of specific values that are within a Cisco Discovery Protocol message. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges or cause the Cisco Discovery Protocol process to crash and restart multiple times, which would cause the affected device to reload, resulting in a DoS condition. Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).

The weakness was released 08/25/2022 as cisco-sa-nxos-cdp-dos-ce-wWvPucC9. The advisory is available at tools.cisco.com. This vulnerability was named CVE-2022-20824 since 11/02/2021. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 10/01/2022).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• FXOS
• NX-OS

License

• commercial

Website

• Vendor: https://www.cisco.com/

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