Vulnerability identifier: #VU58626

Vulnerability risk: Critical

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20045

CWE-ID: CWE-122

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 execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the RAC_COPY_TO (RacNumber 36) method which allows users to upload files to an SMB share and can be called without any authentication. A remote attacker can pass specially crafted data to the application, trigger a heap-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

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

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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.