Authentication bypass in SonicWall Directory Services Connector

1) Improper Authentication

EUVDB-ID: #VU51244

Risk: High

CVSSv4.0: 6.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

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

CPE2.3

• cpe:2.3:a:sonicwall:directory_services_connector:4.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:sonicwall:directory_services_connector:4.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:sonicwall:directory_services_connector:4.1.2:*:*:*:*:*:*:*

External links

https://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.