Denial of service in Cisco NX-OS Software OSPFv3

1) Out-of-bounds read

EUVDB-ID: #VU66749

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-20823

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition when processing OSPFv3 packets. A remote attacker can send specially crafted OSPFv3 link-state advertisement (LSA) packets to an affected device, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: 8.2 - 8.2.7

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: All versions

Nexus 9000 Series Fabric Switches: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_nx-os:8.2:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_nx-os:8.2.1:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_nx-os:8.2.2:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_3000_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_5500_platform_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_5600_platform_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_6000_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_7000_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_9000_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:nexus_9000_series_fabric_switches:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ospfv3-dos-48qutcu
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz68748
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb50012
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb50013
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb50015

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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