Denial of service in SonicWall SMA 100 Series

1) OS Command Injection

EUVDB-ID: #VU56851

Risk: Low

CVSSv4.0: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:A/U:Clear]

CVE-ID: CVE-2021-20035

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation in the SMA100 management interface. A remote user can send a specially crafted request to the application and execute arbitrary OS commands on the target system as a 'nobody' user.

Successful exploitation of the vulnerability may lead to denial of service.

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-2021-0022

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.