CVE-2020-3524

CVSS V2 Medium 6.9 CVSS V3 Medium 6.8

Description

A vulnerability in the Cisco IOS XE ROM Monitor (ROMMON) Software for Cisco 4000 Series Integrated Services Routers, Cisco ASR 920 Series Aggregation Services Routers, Cisco ASR 1000 Series Aggregation Services Routers, and Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, physical attacker to break the chain of trust and load a compromised software image on an affected device. The vulnerability is due to the presence of a debugging configuration option in the affected software. An attacker could exploit this vulnerability by connecting to an affected device through the console, forcing the device into ROMMON mode, and writing a malicious pattern using that specific option on the device. A successful exploit could allow the attacker to break the chain of trust and load a compromised software image on the affected device. A compromised software image is any software image that has not been digitally signed by Cisco.

Overview

CVE ID
CVE-2020-3524

Assigner
ykramarz@cisco.com

Vulnerability Status
Analyzed

Published Version
2020-09-24T18:15:21

Last Modified Date
2020-10-08T14:35:21

Weakness Enumerations

CWE	URL
CWE-862	http://cwe.mitre.org/data/definitions/862.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version End
		AND
cpe:2.3:o:cisco:ios_xe_rom_monitor::::::::	1	OR	16.2\(1r\)
cpe:2.3:h:cisco:isr_4221:-:::::::*	0	OR
cpe:2.3:h:cisco:isr_4331:-:::::::*	0	OR
cpe:2.3:h:cisco:isr_4431:-:::::::*	0	OR
cpe:2.3:h:cisco:isr_4461:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xe_rom_monitor::::::::	1	OR	15.6\(18r\)
cpe:2.3:h:cisco:asr-920-10sz-pd:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-12cz-a:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-12cz-d:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-12sz-a:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-12sz-d:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-20sz-m:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-24sz-im:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-24sz-m:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-24tz-m:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-4sz-a:-:::::::*	0	OR
cpe:2.3:h:cisco:asr-920-4sz-d:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_920u-12sz-im:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xe_rom_monitor::::::::	1	OR	16.2\(1r\)
cpe:2.3:h:cisco:asr_1000-x:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_1001:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_1001-x:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_1002:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_1002-x:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_1004:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_1006:-:::::::*	0	OR
cpe:2.3:h:cisco:asr_1013:-:::::::*	0	OR
		AND
cpe:2.3:o:cisco:ios_xe_rom_monitor::::::::	1	OR	16.4\(1r\)s
cpe:2.3:h:cisco:cbr8:-:::::::*	0	OR

CVSS Version 2

Version
2.0

Vector String
AV:L/AC:M/Au:N/C:C/I:C/A:C

Access Vector
LOCAL

Access Compatibility
MEDIUM

Authentication
NONE

Confidentiality Impact
COMPLETE

Integrity Impact
COMPLETE

Availability Impact
COMPLETE

Base Score
6.9

Severity
MEDIUM

Exploitability Score
3.4

Impact Score
10

CVSS Version 3

Version
3.1

Vector String
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
PHYSICAL

Attack Compatibility
LOW

Privileges Required
NONE

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
6.8

Base Severity
MEDIUM

Exploitability Score
0.9

Impact Score
5.9

References

Reference URL	Reference Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rommon-secboot-7JgVLVYC	Vendor Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2020-3524
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-3524

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 17:09:46				Added to TrackCVE
2022-12-04 23:19:38	psirt@cisco.com	ykramarz@cisco.com	CVE Assigner	updated
2022-12-04 23:19:38	2020-09-24T18:15Z	2020-09-24T18:15:21	CVE Published Date	updated
2022-12-04 23:19:38		2020-10-08T14:35:21	CVE Modified Date	updated
2022-12-04 23:19:38		Analyzed	Vulnerability Status	updated