#VU34072 Stack-based buffer overflow in NETGEAR products - CVE-2020-15636

Vulnerability identifier: #VU34072

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-15636

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
R6700
Hardware solutions / Routers for home users
R6400
Hardware solutions / Routers for home users
R7000
Hardware solutions / Routers for home users
R7850
Hardware solutions / Routers for home users
R7900
Hardware solutions / Routers for home users
R8000
Hardware solutions / Routers for home users
RS400
Hardware solutions / Routers for home users
XR300
Hardware solutions / Routers for home users

Vendor: NETGEAR

Description

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

The vulnerability exists due to a boundary error within the "check_ra" service. A remote unauthenticated attacker can use a specially crafted "raePolicyVersion" in a "RAE_Policy.json" file, trigger stack-based buffer overflow and 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

R6700: before 1.0.4.98

R6400: before 1.0.4.98

R7000: before 1.0.4.98

R7850: before 1.0.4.98

R7900: before 1.0.4.98

R8000: before 1.0.4.98

RS400: before 1.0.4.98

XR300: before 1.0.4.98

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External links
https://www.zerodayinitiative.com/advisories/ZDI-20-937/
https://kb.netgear.com/000062128/Security-Advisory-for-Pre-Authentication-Stack-Overflow-on-R6700v3-PSV-2020-0224

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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.