HP ThinPro 6.x / 7.x Citrix Command Injection

HP ThinPro versions 7.1, 7.0, 6.2.1, and 6.2 suffer from a Citrix receiver connection wrapper command injection vulnerability.

MD5 | 301879be06768cb2bb289a3ce523bf8d

HP ThinPro - Citrix command injection

* CVE-2019-18909

CVSSv3 score
6.1 (AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)

HP - [https://www.hp.com](https://www.hp.com)

Deliver secure desktop virtualization that’s as comfortable for IT as it is
for end users with the stunningly redesigned HP ThinPro. It has a bold new
user interface and workflow refinements that make it a breeze to configure,
manage, and use right out of the box.

Affected versions
- HP ThinPro Linux 7.1
- HP ThinPro Linux 7.0
- HP ThinPro Linux 6.2.1
- HP ThinPro Linux 6.2

Eldar Marcussen - xen1thLabs - Software Labs

Vulnerability summary
The Citrix receiver conection wrapper function does not safely handle user
supplied data allowing an unauthenticated attacker to use commandline
syntax to execute arbitrary commands on the device.

Technical details
The user supplied values provided for the domain portion of the login
screens for `Citrix receiver` is vulnerable to command injection, an
unauthenticated attacker can exploit this to execute commands with the
privileges of the local user.

Proof of concept
The following evidence is provided to illustrate the existence and

1. At the `Citrix receiver` login screen enter the following details:
* username: \pwnt
* password: pwnt
* Domain should be empty
2. Click `Connect`
3. In the `Citrix server details` window, enter the following for domain:
`;xterm;echo `
4. Click `Connect`
5. Observe that xterm spawns

Contact vendor for a solution

Date | Status
19-AUG-2019 | Reported to vendor
22-NOV-2019 | Patch available
24-MAR-2020 | Public disclosure

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