Vulnerability identifier: #VU58620

Vulnerability risk: High

CVSSv3.1: 9.2 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2021-20039

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
SMA 100
Hardware solutions / Security hardware applicances

Vendor: SonicWall

Description

The vulnerability allows a remote user to compromise the affected system.

The vulnerability exists due to the SonicWall SMA SSLVPN `/cgi-bin/viewcert` endpoint allows users to upload, view, or delete SSL certificates. A remote authenticated user can send a specially crafted HTTP POST request to the affected SSL VPN interface and execute arbitrary commands on the system with root privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SMA 100: 10.2.1.1-19sv, 10.2.0.8-37sv, 9.0.0.11-31sv

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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 authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.