Hard-coded cryptographic key in Serv-U FTP Server

1) Use of Hard-coded Cryptographic Key

EUVDB-ID: #VU70473

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-35252

CWE-ID: CWE-321 - Use of Hard-coded Cryptographic Key

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to usage of a common encryption key across all deployed instances of Serv-U FTP Server. A remote attacker with access to the encryption key can decrypt any information stored on the servers.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.1 - 15.3

CPE2.3

• cpe:2.3:a:solarwinds:serv-u_ftp_server:15.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_ftp_server:15.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_ftp_server:15.1.2:*:*:*:*:*:*:*

External links

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35252
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-3-2_release_notes.htm
https://www.solarwinds.com/trust-center/security-advisories/CVE-2021-35252

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

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.