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SolarWinds Serv-U FTP Server 15.2.1 Path Traversal

SolarWinds Serv-U FTP Server 15.2.1 Path Traversal
Posted Feb 12, 2021
Authored by Jack Misiura

SolarWinds Serv-U File Server versions through 15.2.1 do not correctly validate path information, allowing the disclosure of files and directories outside of the user's home directory via a specially crafted GET request.

tags | exploit, file inclusion
advisories | CVE-2020-27994
MD5 | bcff8e686a6d68a1e71f68016c03b076

SolarWinds Serv-U FTP Server 15.2.1 Path Traversal

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Title: Path traversal



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-2020-27994



Author: Jack Misiura from The Missing Link



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



Timeline:



2020-10-28 Disclosed to Vendor

2021-01-21 Vendor releases patched version

2021-08-02 Publication



1. Vulnerability Description



SolarWinds Serv-U File Server through 15.2.1 does not correctly validate path information, allowing the disclosure of files and directories outside of the user's home directory via a specially crafted GET request.





2. PoC



On a vulnerable Serv-U installation issue the following GET request to get a listing of files and directories above the user's directory:



https://<serv-u host>/Web Client/?Command=List&dir=\..\*.*



The user *MUST* be locked to their directory, and only access granted must be the said directory. Directory listing must be enabled. If any of the above is not present, the exploit will not work.



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












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








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





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