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CVE-2021-40847

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.

Published

2021-09-21T18:15:07.377

Last Modified

2024-11-21T06:24:55.017

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.1 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

8.6

Impact Score

10.0

Weaknesses
  • Type: Primary
    CWE-319
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System netgear r6400v2_firmware 1.0.4.106 Yes
Hardware netgear r6400v2 - No
Operating System netgear r6700_firmware 1.0.2.16 Yes
Hardware netgear r6700 - No
Operating System netgear r6700v3_firmware 1.0.4.106 Yes
Hardware netgear r6700v3 - No
Operating System netgear r6900_firmware 1.0.2.16 Yes
Hardware netgear r6900 - No
Operating System netgear r6900p_firmware 1.3.2.134 Yes
Hardware netgear r6900p - No
Operating System netgear r7000_firmware 1.0.11.123 Yes
Hardware netgear r7000 - No
Operating System netgear r7000p_firmware 1.3.2.134 Yes
Hardware netgear r7000p - No
Operating System netgear r7850_firmware 1.0.5.68 Yes
Hardware netgear r7850 - No
Operating System netgear r7900_firmware 1.0.4.38 Yes
Hardware netgear r7900 - No
Operating System netgear r8000_firmware 1.0.4.68 Yes
Hardware netgear r8000 - No
Operating System netgear rs400_firmware 1.5.0.68 Yes
Hardware netgear rs400 - No
References