Barco wePresent Global Hardcoded Root SSH Password

Vulnerability Details

Affected Vendor: Barco
Affected Product: wePresent WiPG-1600W
Affected Version: 2.5.1.8, 2.5.0.25, 2.5.0.24, 2.4.1.19
Platform: Embedded Linux
CWE Classification: CWE-798: Use of Hard-coded Credentials
CVE ID: CVE-2020-28334

Vulnerability Description

The Barco wePresent device has a hardcoded root password hash
included in the firmware image. To our knowledge the password
hash has not been cracked and published; it is possible this
could occur at any time. This combined with KL-001-2020-004
(CVE-2020-28329), KL-001-2020-005 (CVE-2020-28330), and
KL-001-2020-007 (CVE-2020-28331) could be used in a simple
and automated exploit chain to go from unauthenticated remote
attacker to root shell.

Technical Description

In looking at the unpacked firmware, a root hash was quickly
identified in the /etc/shadow file on the device. It is the
only account in the /etc/shadow. The device does not prompt
the administrator to set a new root password, therefore this
password is hardcoded and exists across all devices.

Mitigation and Remediation Recommendation

The vendor has released an updated firmware (2.5.3.12) which
remediates the described vulnerability. Firmware and release
notes are available at:

https://www.barco.com/en/support/software/R33050104

Credit

This vulnerability was discovered by Jim Becher (@jimbecher) of
KoreLogic, Inc.

Disclosure Timeline

2020.08.24 - KoreLogic submits vulnerability details to
Barco.
2020.08.25 - Barco acknowledges receipt and the intention
to investigate.
2020.09.21 - Barco notifies KoreLogic that this issue,
along with several others reported by KoreLogic,
will require more than the standard 45 business
day remediation timeline. Barco requests to delay
coordinated disclosure until 2020.12.11.
2020.09.23 - KoreLogic agrees to 2020.12.11 coordinated disclosure.
2020.09.25 - Barco informs KoreLogic of their intent to acquire
CVE number for this vulnerability.
2020.11.09 - Barco shares CVE number with KoreLogic and announces
their intention to release the updated firmware
ahead of schedule, on 2020.11.11. Request that KoreLogic
delay public disclosure until 2020.11.20.
2020.11.11 - Barco firmware release.
2020.11.20 - KoreLogic public disclosure.

Proof of Concept

After unpacking the firmware:
$ ls -al etc/shadow
-rwxr-xr-x 1 user user 59 May 25 00:11 etc/shadow

$ cat etc/shadow
root:$1$reqE8o6b$[REDACTED]:12940:0:99999:7:::