Authentication bypass in SonicWall Directory Services Connector

1) Improper Authentication

EUVDB-ID: #VU51244

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests in SonicWall SSO-agent default configuration, when Microsoft NetAPI is selected as a client probing method. A remote attacker can send a specially crafted NetWkstaUserEnum  request, bypass authentication process and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Directory Services Connector: 4.1.0 - 4.1.17

External links

http://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0003

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.