Vulnerability identifier: #VU47213

Vulnerability risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3513

CWE-ID: CWE-749

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco ASR 900 Series
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a local user to execute arbitrary code at bootup and break the chain of trust.

The vulnerability exists due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. A local administrator can copy a specific file to the local file system, define specific ROMMON variables and run arbitrary code on the system with root privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco ASR 900 Series: All versions

Cisco IOS XE: 16.12.1

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-rsp3-rce-jVHg8Z7c

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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.