#VU34070 Format string error in R6700 - CVE-2020-15634

Vulnerability identifier: #VU34070

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-15634

CWE-ID: CWE-134

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
R6700
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 format string error when handling the string table file uploads. A remote attacker on the local network can supply a specially crafted input that contains format string specifiers 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

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External links
https://www.zerodayinitiative.com/advisories/ZDI-20-935/
https://kb.netgear.com/000062126/Security-Advisory-for-Pre-Authentication-Command-Injection-on-R6700v3-PSV-2020-0189

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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