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

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CVE-2021-40847

Severity CVSS v4.0:
Pending analysis
Type:
CWE-319 Cleartext Transmission of Sensitive Information
Publication date:
21/09/2021
Last modified:
07/10/2021

Description

The update process of the Circle Parental Control Service on various NETGEAR routers allows remote attackers to achieve remote code execution as root via a MitM attack. While the parental controls themselves are not enabled by default on the routers, the Circle update daemon, circled, is enabled by default. This daemon connects to Circle and NETGEAR to obtain version information and updates to the circled daemon and its filtering database. However, database updates from NETGEAR are unsigned and downloaded via cleartext HTTP. As such, an attacker with the ability to perform a MitM attack on the device can respond to circled update requests with a crafted, compressed database file, the extraction of which gives the attacker the ability to overwrite executable files with attacker-controlled code. This affects R6400v2 1.0.4.106, R6700 1.0.2.16, R6700v3 1.0.4.106, R6900 1.0.2.16, R6900P 1.3.2.134, R7000 1.0.11.123, R7000P 1.3.2.134, R7850 1.0.5.68, R7900 1.0.4.38, R8000 1.0.4.68, and RS400 1.5.0.68.

Impact

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

Base Score: 8.10 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Base Score 3.x
8.10
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:M/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 9.30 HIGH
Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

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

Base Score 2.0
9.30
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:netgear:r6400v2_firmware:1.0.4.106:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r6400v2:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6700_firmware:1.0.2.16:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r6700:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6700v3_firmware:1.0.4.106:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r6700v3:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6900_firmware:1.0.2.16:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r6900:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6900p_firmware:1.3.2.134:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r6900p:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7000_firmware:1.0.11.123:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r7000:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7000p_firmware:1.3.2.134:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r7000p:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7850_firmware:1.0.5.68:*:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools