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SolarWinds Serv-U FTP Server 15.2.1 Cross Site Scripting

SolarWinds Serv-U FTP Server 15.2.1 Cross Site Scripting
Posted Feb 12, 2021
Authored by Jack Misiura

SolarWinds Serv-U FTP Server versions through 15.2.1 do not correctly sanitize and validate the user-supplied directory names, allowing malicious users to create directories that when clicked on (in the breadcrumb menu) will trigger cross site scripting payloads.

tags | exploit, xss
advisories | CVE-2020-28001
SHA-256 | 63b2c20217bc49cd26d5d1117a3e0ef300ddd3efe77e545937de5ae02474c7ac

SolarWinds Serv-U FTP Server 15.2.1 Cross Site Scripting

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Title: Stored XSS



Product: SolarWinds Serv-U FTP Server



Vendor Homepage: https://www.solarwinds.com/



Vulnerable Version: 15.2.1 and lower



Fixed Version: 15.2.2



CVE Number: CVE-2020-28001



Author: Jack Misiura from The Missing Link



Website: https://www.themissinglink.com.au



Timeline:



2020-10-30 Disclosed to Vendor

2021-01-21 Vendor releases patched version

2021-08-02 Publication



1. Vulnerability Description



SolarWinds Serv-U FTP server through 15.2.1 does not correctly sanitize and validate the user-supplied directory names, allowing malicious users to create directories that when clicked on (in the breadcrumb menu) will trigger XSS payloads.



2. PoC



On a vulnerable Serv-U FTP server installation, create a directory named as such:



%27%29%3Ba%3Dfunction%28b%29%20%7B%20alert%28%22XSS%22%29%3B%20%7D%3Ba%28%27



The payload contains ');a=function(b) { alert("XSS"); };a('



As soon as a user clicks on the directory name in the breadcrumb menu, it will trigger the stored XSS.



3. Solution



The vendor provides an updated version (15.2.2) which should be installed immediately.



4. Advisory URL



https://www.themissinglink.com.au/security-advisories








Jack Misiura​


Application Security Consultant




a



9‑11 Dickson Avenue


Artarmon


NSW


2064



p


1300 865 865



os


+61 2 8436 8585



w


<https://www.themissinglink.com.au/> themissinglink.com.au












<https://www.linkedin.com/company/the-missing-link-pty-ltd/>

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<https://twitter.com/TML_au>

<https://www.youtube.com/channel/UC2kd4mDmBs3SjW4lX3fFHnQ>

<https://www.instagram.com/the_missing_link_it/>








<https://www.themissinglink.com.au/our-inclusive-culture>





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