Date: Mon, 8 Feb 2021 05:50:27 +0000
From: Jack Misiura via Fulldisclosure <fulldisclosure@...lists.org>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: [FD] Path traversal in SolarWinds Serv-U File Server <=15.2.1

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








 



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

 <https://www.facebook.com/The-Missing-Link-268395013346228/?ref=bookmarks> 

 <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> 





​CAUTION - This message may contain privileged and confidential information intended only for the use of the addressee named above. If you are not the intended recipient of this message you are hereby notified that any use, dissemination, distribution or reproduction of this message is prohibited. If you have received this message in error please notify The Missing Link immediately. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of The Missing Link.

 


Download attachment "image001.png" of type "image/png" (16959 bytes)

Download attachment "image002.png" of type "image/png" (4195 bytes)

Download attachment "image003.png" of type "image/png" (4210 bytes)

Download attachment "image004.png" of type "image/png" (4248 bytes)

Download attachment "image005.png" of type "image/png" (4249 bytes)

Download attachment "image006.png" of type "image/png" (4340 bytes)

Download attachment "image007.png" of type "image/png" (29924 bytes)

Download attachment "smime.p7s" of type "application/pkcs7-signature" (4972 bytes)


_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/

Powered by blists - more mailing lists