CVE-2021-34865

CVSS V2 High 8.3 CVSS V3 High 8.8

Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of multiple NETGEAR routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-13313.

Overview

CVE ID
CVE-2021-34865

Assigner
zdi-disclosures@trendmicro.com

Vulnerability Status
Analyzed

Published Version
2022-01-25T16:15:08

Last Modified Date
2022-10-27T11:53:26

Weakness Enumerations

CWE	URL
CWE-697	http://cwe.mitre.org/data/definitions/697.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version End
		AND
cpe:2.3:o:netgear:ac2100_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:ac2100:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:ac2400_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:ac2400:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:ac2600_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:ac2600:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:d7000v1_firmware::::::::	1	OR	1.0.1.80
cpe:2.3:h:netgear:d7000v1:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6220_firmware::::::::	1	OR	1.1.0.110
cpe:2.3:h:netgear:r6220:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6230_firmware::::::::	1	OR	1.1.0.110
cpe:2.3:h:netgear:r6230:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6260_firmware::::::::	1	OR	1.1.0.84
cpe:2.3:h:netgear:r6260:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6330_firmware::::::::	1	OR	1.1.0.84
cpe:2.3:h:netgear:r6330:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6350_firmware::::::::	1	OR	1.1.0.84
cpe:2.3:h:netgear:r6350:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6700v2_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:r6700v2:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6800_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:r6800:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6850_firmware::::::::	1	OR	1.1.0.84
cpe:2.3:h:netgear:r6850:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r6900v2_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:r6900v2:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r7200_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:r7200:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r7350_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:r7350:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r7400_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:r7400:-:::::::*	0	OR
		AND
cpe:2.3:o:netgear:r7450_firmware::::::::	1	OR	1.2.0.88
cpe:2.3:h:netgear:r7450:-:::::::*	0	OR

CVSS Version 2

Version
2.0

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

Access Vector
ADJACENT_NETWORK

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
COMPLETE

Integrity Impact
COMPLETE

Availability Impact
COMPLETE

Base Score
8.3

Severity
HIGH

Exploitability Score
6.5

Impact Score
10

CVSS Version 3

Version
3.1

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

Attack Vector
ADJACENT_NETWORK

Attack Compatibility
LOW

Privileges Required
NONE

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
HIGH

Availability Impact
HIGH

Base Score
8.8

Base Severity
HIGH

Exploitability Score
2.8

Impact Score
5.9

References

Reference URL	Reference Tags
https://www.zerodayinitiative.com/advisories/ZDI-21-1051/	Third Party Advisory VDB Entry
https://kb.netgear.com/000063955/Security-Advisory-for-Authentication-Bypass-Vulnerability-on-Some-Routers-PSV-2021-0083?article=000063955	Vendor Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-34865
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34865

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 06:35:31				Added to TrackCVE
2022-12-06 07:39:13	2022-01-25T16:15Z	2022-01-25T16:15:08	CVE Published Date	updated
2022-12-06 07:39:13		2022-10-27T11:53:26	CVE Modified Date	updated
2022-12-06 07:39:13		Analyzed	Vulnerability Status	updated