#VU54584 Stored cross-site scripting in Serv-U FTP Server - CVE-2021-32604

Vulnerability identifier: #VU54584

Vulnerability risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: CVE-2021-32604

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Serv-U FTP Server
Server applications / File servers (FTP/HTTP)

Vendor: SolarWinds

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the "SenderEmail" parameter. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Serv-U FTP Server: 15.2.2

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External links
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-2-3_release_notes.htm

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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. However, proof of concept for this vulnerability is available.