Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2020-3417

Severity CVSS v4.0:
Pending analysis
Type:
CWE-78 OS Command Injections
Publication date:
24/09/2020
Last modified:
07/11/2023

Description

A vulnerability in Cisco IOS XE Software could allow an authenticated, local attacker to execute persistent code at boot time and break the chain of trust. This vulnerability is due to incorrect validations by boot scripts when specific ROM monitor (ROMMON) variables are set. An attacker could exploit this vulnerability by installing code to a specific directory in the underlying operating system (OS) and setting a specific ROMMON variable. A successful exploit could allow the attacker to execute persistent code on the underlying OS. To exploit this vulnerability, the attacker would need access to the root shell on the device or have physical access to the device.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.70 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
6.70
Severity 3.x
MEDIUM
Vector 2.0
AV:L/AC:L/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.20 HIGH
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Attack Vector (AV): Local
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
7.20
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:ios_xe:3.18.0sp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.1asp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.1bsp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.1csp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.1gsp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.1hsp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.1isp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.1sp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.2asp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.2sp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.3asp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.3bsp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.3sp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.4sp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.18.5sp:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools