Multi-factor authentication bypass in SolarWinds Serv-U

1) Improper Authentication

EUVDB-ID: #VU80430

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-40060

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote user to bypass MFA authentication.

The vulnerability exists due to an error in the authentication process. A remote user with administrative credentials can bypass multi-factor/two-factor authentication and gain unauthorized access to the application.

Note, the vulnerability exists due to incomplete patch for #VU79825 (CVE-2023-35179)

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.4 HF1

External links

http://www.solarwinds.com/trust-center/security-advisories/cve-2023-40060

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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