#VU58622 Infinite loop in SMA 100 - CVE-2021-20041

Vulnerability identifier: #VU58622

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20041

CWE-ID: CWE-835

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 perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in the "/fileshare/sonicfiles/sonicfiles" endpoint in the `fileexplorer` process. A remote non-authenticated attacker can send specially crafted HTTP request to the system and consume all available CPU resources.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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

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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.