Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2020-27867

Severity CVSS v4.0:
Pending analysis
Type:
CWE-77 Command Injection
Publication date:
12/02/2021
Last modified:
26/03/2021

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. When parsing the funjsq_access_token parameter, the process does not properly validate a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11653.

Impact

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

Base Score: 6.80 MEDIUM
Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Adjacent
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
6.80
Severity 3.x
MEDIUM
Vector 2.0
AV:A/AC:L/Au:S/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.70 HIGH
Vector: AV:A/AC:L/Au:S/C:C/I:C/A:C

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Authentication (Au): Single
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
7.70
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:netgear:ac2100_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)
cpe:2.3:h:netgear:ac2100:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ac2400_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)
cpe:2.3:h:netgear:ac2400:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ac2600_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)
cpe:2.3:h:netgear:ac2600:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6700_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)
cpe:2.3:h:netgear:r6700:v2:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6800_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)
cpe:2.3:h:netgear:r6800:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6900_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)
cpe:2.3:h:netgear:r6900:v2:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7200_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)
cpe:2.3:h:netgear:r7200:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7350_firmware:*:*:*:*:*:*:*:* 1.2.0.76 (excluding)

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


References to Advisories, Solutions, and Tools