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Serv-U File Renaming Directory Traversal and 'STOU' DoS Vulnerabilities

Information

Severity

Severity

High

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

7.5

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

13 years ago

Modified

Modified

3 years ago

Summary

The host is running Serv-U FTP Server, which is prone to Directory Traversal and Denial of Service Vulnerabilities.

Insight

Insight

The flaws are due to, - error in handling 'STOU' FTP command. It can exhaust available CPU resources when exploited through a specially crafted argument value. - input validation error in the FTP service when renaming files which can be exploited to overwrite or rename files via directory traversal attacks.

Affected Software

Affected Software

RhinoSoft Serv-U FTP Server 7.3.0.0 and prior

Solution

Solution

Upgrade to RhinoSoft Serv-U FTP Server 10 or later.

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1. Download Multipass

sudo snap install multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

3. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. If you don’t have it already, install Brew. Then, to install Multipass simply execute:

brew install --cask multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

2. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. Download the installer for Windows

Note: You need Windows 10 Pro/Enterprise/Education v 1803 or later, or any Windows 10 with VirtualBox

2. Ensure your network is private

Make sure your local network is designated as private, otherwise Windows prevents Multipass from starting.

3. Run the installer

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4. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04

5. Log into the multipass instance

multipass shell mageni

6. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash