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Cisco Patches Excessive-Severity Vulnerabilities in Enterprise Switches

By Ionut Arghire on August 25, 2022

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Cisco this week introduced patches for 2 vulnerabilities impacting the NX-OS software program that powers its Nexus-series enterprise switches.

Impacting the OSPF model 3 (OSPFv3) characteristic of NX-OS, the primary of those points is tracked as CVE-2022-20823 and might be exploited remotely, with out authentication, to trigger a denial-of-service (DoS) situation.

The flaw exists as a result of incomplete enter validation of particular OSPFv3 packets, permitting an attacker to ship a malicious OSPFv3 link-state commercial (LSA) to a susceptible machine as a way to set off the bug.

“A profitable exploit may permit the attacker to trigger the OSPFv3 course of to crash and restart a number of instances, inflicting the affected machine to reload and leading to a DoS situation,” Cisco notes in an advisory.

The tech big additionally notes that the OSPFv3 characteristic is disabled by default and that an attacker can exploit the vulnerability if they’ll “set up a full OSPFv3 neighbor state with an affected machine”.

The second NX-OS vulnerability that Cisco addressed this week may also be exploited to trigger a DoS situation. Tracked as CVE-2022-20824, the bug resides within the Cisco Discovery Protocol characteristic and impacts the FXOS software program as effectively.

Brought on by the improper validation of particular values inside a Cisco Discovery Protocol message, the flaw might be exploited by sending malicious Discovery Protocol packets to a susceptible machine.

“A profitable exploit may permit the attacker to execute arbitrary code with root privileges or trigger the Cisco Discovery Protocol course of to crash and restart a number of instances, which might trigger the affected machine to reload, leading to a DoS situation,” Cisco explains.

As a result of the Discovery Protocol is a Layer 2 protocol, an attacker seeking to exploit the flaw must be Layer 2 adjoining (in the identical broadcast area) to the affected machine.

Cisco has launched software program updates to deal with these vulnerabilities and recommends that prospects use the Cisco Software program Checker to determine FXOS or NX-OS releases that repair the problems described within the advisories that the software identifies.

The corporate says these vulnerabilities will not be exploited in assaults and that it isn’t conscious of the general public existence of exploit code concentrating on them.

This week, Cisco additionally resolved CVE-2022-20921, a high-severity elevation of privilege flaw within the API implementation of ACI Multi-Website Orchestrator (MSO) brought on by improper authorization on a selected API.

An attacker authenticated with non-administrator privileges may use crafted HTTP requests to use the vulnerability and elevate privileges to administrator.

Cisco ACI MSO releases 3.1, 3.zero and earlier have been discovered susceptible. ACI MSO model 3.1(1n) resolves this situation. ACI MSO launch 3.2 is just not affected.

Based on Cisco, proof-of-concept exploit code concentrating on CVE-2022-20921 has been launched publicly, however the firm is just not conscious of malicious assaults concentrating on it.

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