Rapid7 Vulnerability & Exploit Database

Apache Tapestry HMAC secret key leak

Back to Search

Apache Tapestry HMAC secret key leak

Disclosed
04/15/2021
Created
07/23/2021

Description

This exploit finds the HMAC secret key used in Java serialization by Apache Tapestry. This key is located in the file AppModule.class by default and looks like the standard representation of UUID in hex digits (hd) : 6hd-4hd-4hd-4hd-12hd If the HMAC key has been changed to look differently, this module won't find the key because it tries to download the file and then uses a specific regex to find the key.

Author(s)

  • Johannes Moritz
  • Yann Castel (yann.castel <Yann Castel (yann.castel@orange.com)>

Development

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/gather/cve_2021_27850_apache_tapestry_hmac_key
msf auxiliary(cve_2021_27850_apache_tapestry_hmac_key) > show actions
    ...actions...
msf auxiliary(cve_2021_27850_apache_tapestry_hmac_key) > set ACTION < action-name >
msf auxiliary(cve_2021_27850_apache_tapestry_hmac_key) > show options
    ...show and set options...
msf auxiliary(cve_2021_27850_apache_tapestry_hmac_key) > run

Metasploit

Penetration testing software for offensive security teams.
Key Features
Free Metasploit Pro Trial View All Features

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

;