Barco wePresent Hardcoded API Credentials

`KL-001-2020-004 : Barco wePresent Hardcoded API Credentials  
  
Title: Barco wePresent Hardcoded API Credentials  
Advisory ID: KL-001-2020-004  
Publication Date: 2020.11.20  
Publication URL: https://korelogic.com/Resources/Advisories/KL-001-2020-004.txt  
  
  
1. 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-2020-28329  
  
  
2. Vulnerability Description  
  
Barco wePresent device firmware includes a hardcoded API  
account and password that is discoverable by inspecting the  
firmware image. A malicious actor could use this password to  
access authenticated, administrative functions in the API.  
  
  
3. Technical Description  
  
This vulnerability concerns the existence of default, hardcoded  
credentials that can be used to access an API service listening  
on port 4001/tcp.  
  
The password exists in clear text in /etc/lighthttp/admin and in  
a hashed form in etc/lighttpd/lighttpd.user. This information  
was obtained by downloading the firmware from wePresent's  
site and unpacking the firmware. URL for the firmware is  
https://www.barco.com/en/support/wepresent-wipg-1600W/drivers.  
Binwalk, with recursive scanning of extracted files, only  
partially unpacks the firmware. We devised a way to gracefully  
unpack the firmware using 'dd', see KL-001-2020-009 for  
further details.  
  
  
4. 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  
  
  
5. Credit  
  
This vulnerability was discovered by Jim Becher (@jimbecher) of  
KoreLogic, Inc.  
  
  
6. 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.  
  
  
7. Proof of Concept  
  
  
After unpacking the firmware:  
$ ls -al etc/lighttpd/admin  
-rwxr-xr-x 1 jbecher jbecher 36 Feb 6 23:42 etc/lighttpd/admin  
  
$ more etc/lighttpd/admin  
[REDACTED]  
  
  
The contents of this advisory are copyright(c) 2020  
KoreLogic, Inc. and are licensed under a Creative Commons  
Attribution Share-Alike 4.0 (United States) License:  
http://creativecommons.org/licenses/by-sa/4.0/  
  
KoreLogic, Inc. is a founder-owned and operated company with a  
proven track record of providing security services to entities  
ranging from Fortune 500 to small and mid-sized companies. We  
are a highly skilled team of senior security consultants doing  
by-hand security assessments for the most important networks in  
the U.S. and around the world. We are also developers of various  
tools and resources aimed at helping the security community.  
https://www.korelogic.com/about-korelogic.html  
  
Our public vulnerability disclosure policy is available at:  
https://korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.3.txt  
`