Vulnerability identifier: #VU46108

Vulnerability risk: Low

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3454

CWE-ID: CWE-78

Exploitation vector: Network

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
Cisco Nexus 3000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 3600 Platform Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 5500 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 5600 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Nexus 6000 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 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
Cisco Nexus 9500 R-Series
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation of specific Call Home configuration parameters when the software is configured for transport method HTTP. A remote administrator can modify parameters within the Call Home configuration and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: All versions

Cisco MDS 9000 Series Multilayer Switches: 8.2.1

Cisco Nexus 3000 Series Switches: 7.0.0 HSK.0.357 - 8.1.1 S5

Cisco Nexus 3600 Platform Switches: 7.0.3 FR.1.24

Cisco Nexus 5500 Series Switches: 7.0.0 HSK.0.357

Cisco Nexus 5600 Series Switches: 7.0.0 HSK.0.357

Cisco Nexus 6000 Series Switches: 7.0.0 HSK.0.357

Cisco Nexus 7000 Series Switches: 8.1.1

Cisco Nexus 9000 Series Switches NX-OS Mode: 7.0.0 HSK.0.357 - 8.1.1 S5

Cisco Nexus 9500 R-Series: 7.0.3 FR.1.24

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-callhome-cmdinj-zkxzSCY

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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