Remote code execution in NETGEAR devices



Published: 2021-09-22

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Code Injection

EUVDB-ID: #VU56818

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-40847

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in the circled update daemon. A remote attacker can execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

R6400v2: before 1.0.4.120

R6700: before 1.0.2.26

R6700v3: before 1.0.4.120

R6900: before 1.0.2.26

R6900P: before 3.3.142_HOTFIX

R7000: before 1.0.11.128

R7000P: before 1.3.3.142_HOTFIX

R7850: before 1.0.5.76

R7900: before 1.0.4.46

R8000: before 1.0.4.76

RS400: before 1.5.1.80

External links

http://blog.grimm-co.com/2021/09/mama-always-told-me-not-to-trust.html
http://kb.netgear.com/000064039/Security-Advisory-for-Remote-Code-Execution-on-Some-Routers-PSV-2021-0204


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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