Remote denial of service in SonicWall SMA 100 Series

1) Improper access control

EUVDB-ID: #VU56853

Risk: High

CVSSv4.0: 7.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2021-20034

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to delete arbitrary files on the system.

The vulnerability exists due to improper access restrictions in SMA 100 management interface. A remote non-authenticated attacker can bypass implemented path traversal checks and delete an arbitrary file on the system, potentially resulting in a reboot to factory default settings.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SMA 100: 9.0.0.10-28sv - 10.2.1.0-17sv

CPE2.3

• cpe:2.3:h:sonicwall:sma_100:9.0.0.10-28sv:*:*:*:*:*:*:*
• cpe:2.3:h:sonicwall:sma_100:10.2.0.2-20sv:*:*:*:*:*:*:*
• cpe:2.3:h:sonicwall:sma_100:10.2.0.3-24sv:*:*:*:*:*:*:*
• cpe:2.3:h:sonicwall:sma_100:10.2.0.5-d-29sv:*:*:*:*:*:*:*
• cpe:2.3:h:sonicwall:sma_100:10.2.0.6-31sv:*:*:*:*:*:*:*
• cpe:2.3:h:sonicwall:sma_100:10.2.0.7-34sv:*:*:*:*:*:*:*
• cpe:2.3:h:sonicwall:sma_100:10.2.1.0-17sv:*:*:*:*:*:*:*

External links

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0021

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.