CVE-2021-40847
NETGEAR Circle Parental Control Service Root RCE via MitM Attack
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.
INFO
Published Date :
Sept. 21, 2021, 6:15 p.m.
Last Modified :
Oct. 7, 2021, 7:23 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
2.2
Public PoC/Exploit Available at Github
CVE-2021-40847 has a 2 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-40847
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-40847.
| URL | Resource |
|---|---|
| https://blog.grimm-co.com/2021/09/mama-always-told-me-not-to-trust.html | Exploit Third Party Advisory |
| https://kb.netgear.com/000064039/Security-Advisory-for-Remote-Code-Execution-on-Some-Routers-PSV-2021-0204 | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-40847 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-40847 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Oct. 07, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:C/I:C/A:C) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://blog.grimm-co.com/2021/09/mama-always-told-me-not-to-trust.html No Types Assigned https://blog.grimm-co.com/2021/09/mama-always-told-me-not-to-trust.html Exploit, Third Party Advisory Changed Reference Type https://kb.netgear.com/000064039/Security-Advisory-for-Remote-Code-Execution-on-Some-Routers-PSV-2021-0204 No Types Assigned https://kb.netgear.com/000064039/Security-Advisory-for-Remote-Code-Execution-on-Some-Routers-PSV-2021-0204 Vendor Advisory Added CWE NIST CWE-319 Added CPE Configuration AND OR *cpe:2.3:o:netgear:r6400v2_firmware:1.0.4.106:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r6400v2:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r6700_firmware:1.0.2.16:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r6700:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r6700v3_firmware:1.0.4.106:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r6700v3:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r6900_firmware:1.0.2.16:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r6900:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r6900p_firmware:1.3.2.134:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r6900p:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r7000_firmware:1.0.11.123:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r7000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r7000p_firmware:1.3.2.134:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r7000p:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r7850_firmware:1.0.5.68:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r7850:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r7900_firmware:1.0.4.38:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r7900:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:r8000_firmware:1.0.4.68:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:r8000:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:netgear:rs400_firmware:1.5.0.68:*:*:*:*:*:*:* OR cpe:2.3:h:netgear:rs400:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-40847 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-40847
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.68 }} 0.20%
score
0.80581
percentile