Vulnerability identifier: #VU51730

Vulnerability risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1423

CWE-ID: CWE-552

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco Aironet 1540 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 1560 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 1800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 2800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 3800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 4800 Aironet Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9100
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst IW 6300
Hardware solutions / Routers & switches, VoIP, GSM, etc
Integrated AP on 1100 Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco ESW6300 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a local user to overwrite arbitrary files in the underlying host file system.

The vulnerability exists due to insufficient validation of the parameters of a specific CLI command. A local administrator can issue that command with specific parameters and overwrite the content of any arbitrary file that resides on the underlying host file system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Aironet 1540 Series Access Points: 8.4 - 17.3

Cisco Aironet 1560 Series Access Points: 8.4 - 17.3

Cisco Aironet 1800 Series Access Points: 8.4 - 17.3

Cisco Aironet 2800 Series Access Points: 8.4 - 17.3

Cisco Aironet 3800 Series Access Points: 8.4 - 17.3

Cisco 4800 Aironet Access Points: 8.4 - 17.3

Cisco Catalyst 9100: 8.4 - 17.3

Cisco Catalyst IW 6300: 8.4 - 17.3

Integrated AP on 1100 Integrated Services Routers: 8.4 - 17.3

Cisco ESW6300 Series Access Points: 8.4 - 17.3

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-foverwrt-HyVXvrtb

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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.