Vulnerability identifier: #VU79968

Vulnerability risk: Low

CVSSv3.1: 6.2 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20168

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco NX-OS
Operating systems & Components / Operating system
Cisco MDS 9000 Series Multilayer Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 1000V Switch for Microsoft Hyper-V
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 1000V Switch for VMware vSphere
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 3000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 5500 Platform Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 5600 Platform Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 6000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 7000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 9000 Series Switches NX-OS Mode
Hardware solutions / Routers & switches, VoIP, GSM, etc
Nexus 1000 Virtual Edge for VMware vSphere
Server applications / Other server solutions

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a local attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in TACACS+ and RADIUS. A local attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: 4.2(1)SV1(4) - 10.3(2)

Cisco MDS 9000 Series Multilayer Switches: All versions

Nexus 1000 Virtual Edge for VMware vSphere: All versions

Nexus 1000V Switch for Microsoft Hyper-V: All versions

Nexus 1000V Switch for VMware vSphere: All versions

Cisco Nexus 3000 Series Switches: All versions

Nexus 5500 Platform Switches: All versions

Nexus 5600 Platform Switches: All versions

Nexus 6000 Series Switches: All versions

Nexus 7000 Series Switches: All versions

Cisco Nexus 9000 Series Switches NX-OS Mode: All versions

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External links
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-remoteauth-dos-XB6pv74m

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.