Path traversal in Serv-U FTP Server - CVE-2020-27994
Published: February 3, 2021 / Updated: April 17, 2023
Vulnerability identifier: #VU50295
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-27994
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote user to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences passed via the "dir" HTTP GET parameter. A remote user can send a specially crafted HTTP request and read arbitrary files on the system.
Example:
https:///[host]/?Command=List&dir=\..\*.*
Affected software
Serv-U FTP Server
How to mitigate CVE-2020-27994
Install update from vendor's website.
Serv-U FTP Server - update to 15.2.2