Vulnerability identifier: #VU51704

Vulnerability risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1442

CWE-ID: CWE-532

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system
Cisco Catalyst 9800 Series Wireless Controllers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9600 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9200 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 1100 Series Industrial Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9400 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9500 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 9300 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 1000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 4000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Catalyst 3650 Series Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Cloud Services Router 1000V Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco ASR 1000 Series Aggregation Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists in a diagnostic command for the Plug-and-Play (PnP) subsystem of Cisco IOS XE Software. A local low-privileged user can run the diagnostic CLI show pnp profile when a specific PnP listener is enabled on the device and obtain a privileged authentication token. This token can be used to send crafted PnP messages and execute privileged commands on the targeted system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: 16.9.1 - 17.1.1s

Cisco Catalyst 9800 Series Wireless Controllers: All versions

Cisco Catalyst 9600 Series Switches: All versions

Cisco Catalyst 9200 Series Switches: All versions

Cisco 1100 Series Industrial Integrated Services Routers: All versions

Cisco Catalyst 9400 Series Switches: All versions

Cisco Catalyst 9500 Series Switches: All versions

Cisco Catalyst 9300 Series Switches: All versions

Cisco 1000 Series Integrated Services Routers: All versions

Cisco 4000 Series Integrated Services Routers: All versions

Cisco Catalyst 3650 Series Switches: All versions

Cisco Cloud Services Router 1000V Series: All versions

Cisco ASR 1000 Series Aggregation Services Routers: All versions

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-pnp-priv-esc-AmG3kuVL
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt41030

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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.