#VU58621 Arbitrary file upload in SMA 100 - CVE-2021-20040

Vulnerability identifier: #VU58621

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-20040

CWE-ID: CWE-434

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SMA 100
Hardware solutions / Security hardware applicances

Vendor: SonicWall

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to the appliance allows unauthenticated file upload. A remote non-authenticated attacker can send a specially crafted HTTP request to the appliance and upload arbitrary file to any directory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SMA 100: 10.2.0.8-37sv, 10.2.1.1-19sv

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External links
http://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026

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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.