Vulnerability identifier: #VU58619

Vulnerability risk: Critical

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-20038

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: Yes

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 when processing HTTP GET requests in the SonicWall SMA SSLVPN. A remote unauthenticated attacker can send a specially crafted HTTP request to the SSL VPN interface, trigger a stack-based buffer overflow in the mod_cgi module 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: 10.2.1.0-17sv, 10.2.1.1-19sv, 10.2.1.2-24sv

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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?

Yes. This vulnerability is being exploited in the wild.